Music Stand Incorporates a PA Monitor Speaker Cabnet Project

I hope this is useful, I'm the bassist & singer in a country duo (with a guitarist) and I wanted to incorporate a PA vocal monitor & drum machine into my music stand (I run the PA too) to keep everything handy.   https://www.instructables.com/id/Muisc-Stand-PA-Monitor-Speaker-Shelf/

Topic by Jim_L 


Does anyone know how to remove the electronic hum from a paging speaker?

I've got a 12 watt pager speaker. I took this really old black G3 Western electric Telephone. I've wired them to a 1.8 watt dc power supply for the moment. Does anyone know how to remove the eletronic hum from my PA system? Plan on getting a better power supply soon.

Question by playpep   |  last reply


Lightweight Speaker Enclosure

Im coming up to the third (hopefully waterproof) upgrade of my longboard mounted speakers. Im looking for something pre-made like a square pipe or storage box etc, that i can use as an enclosure that has flat ends large enough to mount 6.5" PA speakers onto, is no wider than 8" and no longer than 2ft. It needs to be as lightweight but rigid as possible. Any ideas/links?

Topic by ambientvoid   |  last reply


Possible to build a Powered PA Speaker myself?

I am a musician, so I've been talking about guitar amplifiers, tubes, microphones and all kinds of gear for over 20 years. I've never really gotten that much into PA's, so I know nothing about speakers, heads, mixers, power amplifiers, etc. Now, I'd like to build my own powered PA speaker. I have zero experience with building anything that involves electronics. I'm not a dummy. I know Ohm's law, and I believe I can handle the physics of electronics, no problem. I just do not know where to start. Schematics for power audio amplifiers? Where does one find them, and how do you read schematics. These are the things I need to know.  Let me preface this by saying... I do not expect to build a top-of-the-line PA speaker. I don't even expect to build something that would be considered crappy. I just want to know the theory, and where to start. Anyone got any help? Thanks!

Topic by Dolmetscher007   |  last reply


how to make a direct mic to speaker setup?

I am trying to run a microphone directly to a speaker and I am having some troubles with how to integrate battery or 12v DC power into it. Any suggestions would be greatly appreciated.

Question by nrepak   |  last reply


Matching speakers to amplifier

I have purchased 2 Maxamp20 amplifiers (http://store.accusafe.nl/modules/versterkers/maxamp20-met-3-5mm-connector) and i am trying to match speakers to them, i've searched audio forums for information (that i mostly don't understand) and tried asking questions (that have been mostly ignored) and i think i've found appropriate speakers but i want to get a second opinion before i purchase stuff i might not be able to return. i don't have the space for and can't afford the weight requirements of a large enclosure but i want fairly high volume and wide dispersion so im looking at getting 2 of these PA horns (http://www.specotech.com/index.php/products/audio/item/542-spc40rp) to mount on top of a shallow down firing enclosure for 2 of these subs (http://store.accusafe.nl/onderdelen/luidsprekers/subwoofer/dayton-audio-sd215a-88-8-dvc-subwoofer-speaker). i know the subs work with that amplifier because they are used in Boominators (http://www.diyaudio.com/forums/class-d/104402-boominator-another-stab-ultimate-party-machine.html) but i have no idea about the horns. also assuming this setup is okay do i need some kind of filter or crossover (not sure of the difference) to split the sound safely between the midrange and the sub speakers?

Topic by ambientvoid   |  last reply


Circuit to connect stereo output to 5.1 speaker system?

Hi all! I am after a circuit that will mix a stereo source together (into mono) then pipe it out to a 5.1 speaker system. Obviously the simple solution is to wire the left and rights together and then patch into each speaker on the 5.1 speaker system. However it causes noise and other audio artifacts. I am thinking some form of op-amp type circuit to mix the L and R. That then either can be directly split between the speakers or goes into another pre-amp circuit for each speaker output (maybe even a band-pass for the sub woofer). Just to explain what this is for: I want to have music in a workshop. At the moment we have a standard radio which, to be heard the other side of the 'shop, is quite loud. Those near it then turn it down and arguments start (not quite but you get the idea!). I want to use my old 5.1 computer speaker system to spread the sound around the 'shop evenly so the volume is constant no matter where you are - a poor mans PA system.

Question by smartroad   |  last reply


I got a siren!

A little over a month ago, my dad got a siren on eBay. It's the Wolo Model 345, about halfway down the page. Note: if you want one, go through eBay, Wolo wants $64, but this was brand-new for $20. It's not Instructable-worthy, and I don't have enough pictures to make a Slideshow, so I'm using the Forums for their original use. We were originally going to put this on my mom's ZAP Xebra, because it's completely silent and we wanted a way to warn walkers of her approach, but she didn't like it, so I got it to put in out Ford Courier. Since it's electric, I only go 39 in a 40 mph-zone to save range, so I'm often cut off by people going 45. Being electric, the truck has no radiator, just a flat plate of steel. We were already going to paint it black, so we mounted the horn speaker in there. There is an instrument bay overhead, so I stuffed the control box inside an empty slot. Eventually I'll take off the plastic case and mount it in the aluminum sheet to make it much cleaner, but this is fine for now. There were already two extra switches that did nothing, but already had an always-hot line running to them, so I wired it in to that. It can do sirens, animal noises, or a PA. I'm leaving it set to a police-style siren, so if someone cuts me off, I can just flip the switch and give a short blast, then watch them look around for the police car. If I have more time, I can just use the PA to yell at them. Other potential use: I'm going to make a CD of engine sounds. That way I can make my electric sound like an idling Harley at a stoplight. Or a turbine engine. Or a semi. Or a whatever.

Topic by CameronSS   |  last reply


Turn laptop speakers into aux speakers

My laptop just died and I took it apart. The speakers have a 4-pin connector, which I would like to splice into aux and power to make an aux enabled speaker I can use. How do I do this? Pics: https://goo.gl/photos/PdyBhVxXLBfJfL3Z8 Thanks and RIP laptop. A little eulogy, because why not: Dear laptop, you will be missed. I had you for 5 years and you were a great machine. I took you apart and put you back together. We had a great time together and you lived a long life. I hope you have a great afterlife as a set of speakers, external monitor, hand warmer, and many more projects. You will be missed.

Topic by Nmoleo­   |  last reply



Mounting an LCD Monitor

Hello everyone! I am working on project that involves mounting a 19in LCD monitor onto a board. The monitor has 4 threaded holes in the back for mounting onto an arm or wall mount. I was wondering if anyone knows what kind of screws to use or has any advice on properly and securely mounting the monitor. The monitor is a Westinghouse 19" LCD. The whole project is going to be a small entertainment center for my monitor. I am going to attach speakers and accent lighting. I am doing this for a class project and drafting it in Vectorworks. *If anyone is interested in looking at the plans I will send them to you; however please don't redistribute them. They will be in DWG format. GC

Topic by genericcomment   |  last reply


Cheap Speaker Stand Help?

M'kay, so I just spent several hundred dollars on a PA system and am too broke to afford paying 100+ more for some stands. Anyone wanna help me out with making my own? I'm looking for something like this:http://www.audiolinks.com/Fender/FenderProAudio/speakerstand.jpg(middle item)

Topic by DakotaFloyd   |  last reply


Can someone give me a link explaining what each part of a speaker means? Answered

I just want want a link that tells me how frequency, impedance, cone and sound pressure make a difference in the quality of a speaker. I also want to know what is the best possible in all of these.

Question by metalshiflet   |  last reply


Monitor powered by ATX

I searched for hours with varying keywords and can't find too much information...  12v to pin 1 and GND to pin 2 but what do I do about the neutral? I read a xbox 360 laptop mod but it involves the 5v too, and connects it to the power brick. I'm trying to do something different. Trying to make a lunchbox out of a macpro 1.1 case. 1 wire to plug into an outlet is better than needing two. Before I get into this project im trying to understand what I need to buy and feel kinda silly asking such a question which should be extremely simple but I want to be safe and dont want to fry anything. For those that are actually interested in what I'm doing, I kept staring at the case thinking "what can I make with this, and the items I have laying around?" I thought I'd 1-up the basic hackintosh build and go against the grain of using the case how it's intended. I flipped it so the side with the I/O ports were sitting flat, measured the inside which gave me 7" of workable space with 0.4" wiggle room which made perfect for an mini ITX to be laying flat down instead of against the wall. I thought I could take my dremel and cut out an area for a LCD monitor. I have enough DVD drives laying around as well that I could make a "push tray to eject keyboard" sort of slide out keyboard upgrading the rails, using an ultra thin keyboard with a track pad and top it off with sound activated lights and my 1.5 TB HD that's almost full of music. I realize I can do this with a laptop and pocket usb speaker/light effects, but it wouldn't be as cool and I wouldn't get to reuse these items I have sitting around.

Topic by bvarious   |  last reply


IPod touch to external monitor?

I'm building an all inclusive ipod touch case, including solar panels, external speaker, stylus, rechargeable battery, etc. However,  I was looking at an 8 by 4 inch monitor that would enable me to at the very least watch videos on it. I'm sure it's possible, because the touch has cables capable of taking its 30 pin signal and converting it to rca for connection to a standard tv. The real question then I guess would be, is there any chance of me being able to hook it up to a touchscreen one and/or be able to have it display the springboard instead of just dedicated video out signals. Any help would be appreciated, thanks!

Question by ShiesTech   |  last reply


Screen and Speakers for Portable Console

Hi, I am looking into building a portable gaming setup for my younger brother from, presumably, an HDMI monitor with built in speakers. The catch is I'm shopping around for material to build the casing out of to hold the xbox and to hinge to the screen and I'm having a hard time figuring out what would be an optimal, sleek yet not too expensive option. Anyone with ideas?

Topic by Postnoctum   |  last reply


Two rotating discs, synced and remote controlled.

I realized that I change the angle of my speakers many times a day and it gets really cumbersome. To use my time better, I thought that I'd be nice to have motorized rotating discs under each speaker, wired so that I could adjust their angle from a simple remote controller on my desktop. This would be because if there's a program, the speaker angles would always remain in sync in relation to one another, and because sometimes the speakers are actually located a bit inconveniently in terms of getting near them to adjust the angle manually.  Take a look at the attached image. I can't get that stupid image uploader to work, it uploads but doesn't keep the file, so here goes:  https://dl.dropboxusercontent.com/u/31684214/Speakers.jpg Before you start criticizing it, don't: The point of the image is to demonstrate a principle. It doesn't tell anything about the room that the furniture is in. It isn't in scale. The sound fields of the speakers aren't trying to portray reality accurately, they're just there to make a point. Everything in the image is a rough sketch and its purpose is to make explaining easier.  As you see, the situation is that sometimes I sit at the desk, sometimes at the back of the room. If I keep the speakers pointing almost straight (like image 2) while sitting at the desk, I feel like most of the sound really "opens up" behind my back only, going past me. If I keep the speakers in 45-degree angle (image 1) but decide to watch videos from the sofa, again I feel like the sound isn't quite pointed at me and it's especially difficult to listen to dialogue. Before you start talking about the room - yes, I know about acoustic treatment and I'm taking it onto account already, but my auditory processing isn't normal so the acoustic treatment alone isn't enough, speaker angles make a huge difference for me. I'm saying this because the internet is full of people who get too caught up on the actual principle and start explaining why they think that I don't need something or don't have a problem with something. From having manually adjusted the angle thus far, I already have the experience of how this makes my life easier. I'm looking for advice/help or someone to make this for me as a service. Due to shipping costs, makers should be in Europe only. Advisors who could guide me through, doesn't matter where you are. I'm guessing that besides the disc parts, the remote control would require knowledge on electronics and coding of microcontrollers. The controller could either have a wheel or simply two buttons, one closing the speaker angle, other spreading it wider. The angle range only needs to change within 90 degrees so that suffices, but the program doesn't need a specific angle limiter made if it happens to be able to turn, say, 360 degrees. Taking ideas of methods, estimates, part choices and possible compensation fees!

Topic by rikuzenith   |  last reply


I have some old LCD monitor speakers, and I want to hook them up to my current screen to get stereo sound. Any tips? Answered

So I have the speakers, still wired up to the input slot, the headphone slot, the volume control and anthother one which I cannot identify. I want to hook it up to my current computer screen so that I can achieve stereo sound rather than mono.

Question by roblin90   |  last reply


How to Disable Headphones-Speaker Mute of a Guitar Amp? Answered

Hello! See, we have a nice digital guitar combo amp with a headphones/record out jack. We'd like to connect the amp to the PA system. The thing is, it automatically kills the speaker once you insert something on it like a headphones.  We swish to use the jack as a direct line out without killing the speaker. In addition to this, I also wish to do the same thing on our electric piano with built-in speakers. It does the same thing of muting every time you plug it to the PA. QUESTIONS:: 1. How do you tweak and bypass this mute function on some combo amps/instruments? 2. Does the same principle/switching applies to these situations? Hope to see your post soon! Thanks!

Question by ervzman   |  last reply


What kinda relay do I use to close a circuit when a siren goes off?

I bought some of these http://www.amazon.com/gp/product/B000IF6URO/ref=ox_ya_oh_product and would like to wire up a usb gamepad to detect the siren as a button press. I'd assume this should be very simple the relay will connect to the siren speaker. I can then write an app to email/text message me if the sensor detects water on my kitchen floors.I'd like to know what kind of relay to use (how much power, an exact one would be nice), I just need a momentary circuit close (similar to pressing a key).I'm a programmer with a limited knowledge on circuits.

Topic by sylentmode 


Can usb ports share a ground?

Im converting an old printer (25 pin) switchbox into a switchbox that will be used for my monitor, speakers, keyboard, mouse and two computers. The problem is that the monitor has 15 pins, the speaker has 3 pins, and the two usb ports have 4 pins each meaning that I would need 26 pins rather that 25. I could just solder the left and right speaker pins together and make those two 1 pin, but i would rather not have to do that. My question is can two usb ports share a ground pin, meaning that it would only need 7 pins rather than 8.

Question by danielemur   |  last reply


An old surveillance set-up

At the moment, I am in possession of a really old, monochromatic surveillance monitor and camera. Both the camera and monitor have their own microphones and speakers (low quality), with the camera speaker being the louder one. The monitor has multiple inputs for audio and video (red/yellow/white). The set-up itself is not very large, the monitor is smaller than an overhead project by a 25% or more. Now my question is what do with it?

Topic by DVD Player   |  last reply


What to do with blown speaker/sub baskets?

I picked up some cheap PA cabs all with blown no name speakers, well i have since replaced them and I was wondering what to do with all these baskets?!  i think i may make 2 or 3 lights like this  https://www.instructables.com/id/EL-Wire-subwoofer-lamp/ but what else should I do?

Question by gruda   |  last reply


How can I make a TV CRT Monitor Picture Tube Degaussing Coil? Answered

My TV was stored too close to large speakers, and hence, a very distorted display. Also, any easy way to magnetically shield the speakers? (12" subs, three way mids/highs... floor standing cabinets 3' tall?)

Question by Circuit   |  last reply


urgent| how to add another switch to an existing panel-connected speaker switch?

Hi there ! The problem : I bought a speaker from the Internet to use in some gift . The plan was to get a speaker with a simple ON/OFF button, add the switch to the speaker extension, the speaker will be hidden but the switch added will be visible to the user . Anyway - what I got is a speaker with an electrical panel and an ON \ OFF button that turns the speaker on after ~ 3 seconds of pressing and holding the button. I do not have time to return or buy a new speaker so I wanted to know, if I added a simple ON \ OFF switch connecting the existing switch and the battery, I'll turn on the speaker and from that moment I will control it through the switch I added , will that give me the ability to control the speaker using the  switch I added? I'd be happy to know if it would work or not , and if not, tips on how to accomplish what I'm trying . Thank you !

Question by razolution   |  last reply


How to use ipod screen as raspberry pi monitor?

I have several ipods that more or less seem to have puked on me; i have one-5gen Ipod Video, one Ipod classic and one 16gb gen2 Ipod Touch.  The two former ipods have failed hdd's, but the screens should still theoretically work. The ipod touch is more or less fully functional, minus the speaker/headphone jack. It is also jailbroken.  I wanted to make a super small portable gaming setup with my raspberry pi, and im wondering how (if it is possible) i might be able to salvage one of my ipod screens to use as the display. Does anyone know how? Also, seeing as the raspberry pi has the hdmi output, how would i go about incorporating speakers into the unit as well?

Question by kamikaze33   |  last reply


Some new stuff i got

So recently my dad wanted to throw away a old tv we had that had a bad cord (yeah we could of easily replaced the cord but be have enough tv's..) and i remember seeing plasmana's plasma speaker a while back and that it used a flyback transformer, so i ripped the tv apart taking the pcb with everything on it, speaker, and the coil thingy on the tube, since it was the first time i took one apart i had cliped the magnet wire winding so thats almost no good so i just got rid of that, and then i took apart 3 other monitors i have gotten over the years, one had a set of speakers inside it, and that was interesting to use. and a while back my friend gave me a old 5cd/radio stereo, i would of just kept it using it for the 5 disc changer mostly but the door was broken, and didnt move well at all, so i scraped it and used the speakers. Oh and theres a PSU in there i ripped apart a while ago, i have another but its stored away currently. Anywho heres just a view of what i got, any ideas on what i should make out of all this?

Topic by knexsuperbuilderfreak   |  last reply


DIY Car Speaker Phone with CB Mic

A project I've been trying to do for the longest time is to build a home made speaker phone for my car. There used to be a car phone in it from the pre-cell phone ages and its always sparked my imagination. Basically, from my cell phone's 2.5mm jack to a speaker and to a mic. Now, I have a CB Radio in my Cruiser and it has a built in PA. So what ever I say will come out a 3.5mm jack, very convient for the input for this project. However, I'm a dummy when it comes to speakers. I would have to build a small little loud speaker that would project the sound from my phone. I took apart a headset, so I have the plug for the headset. Now what I don't know is how the wires are arranged in the headset wire and what's the best way to built that speaker from a 2.5mm jack output. The input isn't much of a problem, just gotta figure out which wire in the headset wire is the input... probably red. I'm not much of a electrical guy and I don't currently own a soldering iron. I just have 180w welder.

Topic by Red Beard   |  last reply


Amplifier

Hi all,  I got two 3-way-speakers (8ohm) from my uncle, but I don't have an amplifier. I wanted to use these speakers as audio-monitors for my pc. Is it possible to make an (easy) amplifier-circuit for this use? And do I need one or two circuits (1 circuit-1 speaker / 1 circuit-2 speakers)? Thanks for helping me out! Arnout PS: Sorry if my english isn't that good - I'm from Belgium ;)

Topic by arnoutdejans   |  last reply


How do I go about connecting speakers with different wattage & ohms to the same source?

I have a bunch of old speakers that I wish to use for a project but I'm unsure if they will all work together. I have: 4 x 60W 10Ω 2 x 20W 6Ω 2 x 25W 6Ω 2 x 5W 16Ω with DC in & component input (out of old computer monitor base) Will I be able to connect all the speakers to the circuit board with the power & input? What will I need to do or obtain to make them work together?

Question by apple_juicy   |  last reply


How can I tell if my stereo speakers are bugged? How can I tell if there's a listening device anywhere in my home?

How can I tell if my stereo speakers are bugged? How can I tell if there's a listening device anywhere in my home? Like in phone jacks, air registers, cell phone, or computer.

Question by    |  last reply


Flyback transformer problem?

I have recently dismantled an old CRT monitor i have had lying around for ages to get the flyback transformer. I have been trying to get the correct pins to using methods found on the internet none of which have seemed to work i have found what should be the primary coil and have applied the current and placed the high voltage output in front of each pin to try and find the high voltage ground, this has not worked so i have applied the current to all of the pins in every combination and still i am unable to get it to work. Please help me.

Question by Hav0c   |  last reply


Mother Earth Fair, Seven Springs, PA, USA Sept 21-23 2012

Hi everyone! For those who are interested in modified vehicles, electric vehicles, DIY Hybrids, renewable energy and more, you might want to check out the Mother Earth News Fair. It's coming up really fast. If you are in Pennsylvania, come check it out! I'm going to be a speaker there giving presentations on my DIY electric motorcycle, my most current DIY Hybrid Pickuptruck project, and more! Wear your Instructables shirt and come find me! -Ben Nelson  

Topic by bennelson   |  last reply


bluetooth 4 transmitter to headphone latency reduction

Hey everyone! i'm seeking some advice about a system i've been trying to work out - a bluetooth audio headset from a PA system for vocal monitoring during band rehearsals. currently i'm running microphone -> PA -> bluetooth 4.0 AD2P compatible audio transmitter -> powerbeats bluetooth 4.2 headphones the connection is working fine, the only issue is latency between microphone and headphones (approximately half a second), which makes it very difficult to use as a monitor as i require very minimal latency to hear my voice in synchronisation with the rest of the band. a few questions; does bluetooth simply have an unavoidable lag due to data compression? is it possible for me to hack the bluetooth transmitter in some way to increase the rate of compression/transmission? what would you recommend as a cheap substitute in the event that nothing can be done? thanks very in much in advance, Austin

Topic by totemgoat 


Wireless setup for Guitar

IM new here... what a great site. My Question is. Does anyone see any reason why a baby monitor wouldnt work for a wireless system for guitar. Disconnect speakers install 1/4" buds and find a lil better housing?

Topic by jbartz   |  last reply


Challenge. Building a Lap Desktop. A keyboard, monitor, and speakers. Built into a Laptop case, plugs into a tower.

Scroll down for update I've been looking at new laptops. The ones I want are way to expensive. If I had a desk top I could get a lot more computer for a lot less money.   I have 2 old laptops. I would like to gut one of the laptop cases then install a new lcd monitor into the case which will plug into a desktop. I would like to do the same with the keyboard and the speakers. Whats the point? It won't be a lap top. This is correct. I don't want a lap top. I want a folding monitor speaker and keyboard that fits on my lap with cables that plug into a desktop that is sitting on the floor next to my chair.   I want to easily unplug my Lap Desktop, fold it up and then make it disappear. I want to sit in my comfy chair gaming talking to my wife while we both watch tv. I don't want a corner of my living room dedicated to a big old computer desk. The original idea was to use component parts of the laptop.  The monitor speakers, and keyboard. After doing some research I realize using the monitor won't work. That is ok. I will get a new one. Where to buy it? what to buy? I hope I can still use the laptop case and install the parts I want. and make it all work...  If this project seems like fun give  me a hand. Help me figure out the details. I will take the pictures and make an instruct able and credit who ever has helped me... I know I haven't got a clue and I have not found this product premaid and ready for purchase.... Update The Monitor I found what I need for my laptops lcd conversion to desktop monitor. I will purchase the R.RT6251 from njytouch on ebay. This essentially will allow me to use my old desktop lcd as a computer/tv monitor. I hope it works. I will also be converting the montitor into a touch screen. Njytouch has lots of good feedbadk and I have seen some great videos for their products on youtube. Theoretically I have the montior situation under control. The base. I have given up on the idea of using the original lap top base. I still want a clamshel design. Unfortunately I cannot use my laptops old keyboard. It worked fine for the lap top but like the original road block for the LCD at present I cannot find a easy solution to by pass the proprietary element. I was hoping for another miracle solution from njytouch. Don't think it will happen though. So for my contingency plan. A weighted plexiglass base I will mount my hinged lcd on with a shelf I will set my keyboard on. I have an old logitech g15 keyboard which would be awesome to use again. It sports several usb ports easy access for my peripherals.  When finished I will have a hinged lcd touchscreen mounted on a mounted on a weighted flat lap desk surface.. It will be a lap desk  with a clamshell design for easy storage that will all plug into a desk top computer.  Questions Is Plexi glass the best building material? What would you recommend. I would like it to be inexpensive and relatively light. This set up will be on my lap for hours at a time. So far I'm looking at about $150 for this building project and I don't own a desktop yet :) Are their any additions and improvements to this idea you guys can think of. I'm thinking monitors and speakers also... That may be going overboard though. . 

Question by jshad   |  last reply


can i send serial monitor data from ESP32 board to B+ via Bluetooth?

Hello guys how are you doing ?so I'm currently working on a project from long time ago that was devastating and depressing for me , i will tell you the idea and what progress I made through the past 6 weeks and see if you can lead or help me ,, so the idea is I'm currently connecting esp32 Arduino board with six senses , 5 of them are flex sensors and one of them is the mpu6050 sensor which reads the angle of x y and z I was able to connect those sensors to esp32 and read all the values on the serial monitor as you can see below the code and the serial monitor https://ibb.co/92qBsh0, now my next step that I didn't know how to do is : I want to send those data, the serial monitor data continuously every 6 second to raspberry pi via the Bluetooth of the esp32 to the Bluetooth of the raspberry pi in order to program those data , i want to program those data to an LCD and a speaker ,For example if I received the following values from the esp32 I want the Res pi to put a certain word to the LCD screen and and then convert it to speech through the speaker , I already connected the LCD to the raspberry pi. , but now how I can send the serial monitor data continuously to the pi so I can program it

Topic by bhyamen 


Need to know if i can replace a 22 ohm /10% (1.5w ((I think due to size)) resistor with a 22 ohm / 2% 2watt.

The resistor placement is R2 in a Behringer B215D powered PA speaker. The resistor that was in it is smaller round than the replacement piece,but is the same length. The schematic does not state the wattage of the resistor so I'm a little confused. Any help would be greatly appreciated.  

Question by hal.jensen.9   |  last reply


3.5mm 5.1 Surround Sound Switch/Splitter Box for 2 inputs

Hello, my first post here, so it might be in the wrong section, please move it if necessary. I have quite a complicated problem. Currently I have 1 PC with 5.1 speakers and recently bought a 5.1 headset with microphone. Already  I have a problem when I want to switch between speakers and headphones, each time I have to go under the desk and change the cables :/ In a few months I plan to buy another computer (old one is used up, but it is still quite good equipment). And here begins the stairs. I do not need a second monitor or keyboard plus a mouse, so I want to buy a KVM (keyboard / video/ mouse) switch. The mouse and keyboard are USB ones, so the KVM must support USB. Monitor and graphics card are connected through DVI, which I want to keep, so I must have a DVI KVM. I also want to be able to switch between headphones and speakers. So I thought about this: cs1782 But this works only for one 'source': I could use either speakers or headphones, switching from one PC. But I would like to be able to choose whether I want to use speakers or headphones on both of the PC, so I was thinking about doing (I have not found anything like this to buy, which is strange, because more and more people have the same problem) something like this. But as to be able to do: - Switch between headphones and speakers at PC1 - Switch between headphones and speakers at PC2 - Switch between PC1 and PC2 - Using headphones on PC1 and speakers on PC2 (or vice versa) simultaneously. I've came out with this picture, which should  be able to do this: - Switch between headphones and speakers at PC1 - Switch between headphones and speakers at PC2 - Switch between PC1 and PC2 But I still can't figure how to make this: - Using headphones on PC1 and speakers on PC2 (or vice versa) simultaneously. The more I  think about it, the more I get the idea that it can't be done via DPDT switches, but I don't know what to use. Is it even doable? I have no experience in electronics (I did solder couple of wires in my life, but nothing more), but I have a lot of enthusiasm, so I could make such magic boxes, if I knew how. Thanks in advance for any suggestions, ideas, etc. I also hope that this problem will be useful to someone else.

Topic by ratm4n   |  last reply


My speakers won't give sound (Realtek HD Audio)?

To start off, I'll tell how it all happened. First, almost 3 months ago I bought a PCI Wireless card from newegg, it came in a week later and it was defective. I returned it for a new one and got it another two weeks later (Very slow shipping). It was working, but when I installed what was on the disk it came with, my HD Audio Manager went wacky and said I was plugging in and out audio devices. I just clicked OK on all of them. So I got good speeds but I realized I hadn't any audio coming from my speakers. The realtek HD audio was set to default playback device and both ports on the audio jack were securely in. It simply wouldn't work. A restart didn't fix it either. So I uninstalled and reinstalled the drivers for the PCI Wireless card a couple of times, restarting time after time just going through troubleshooting processes in hope that one would fix it. So during the process, after the first time of uninstalling I found the card defective again only giving 0.8Mb/s download speed just as the first defective card. Over the whole convoluted process I hadn't fixed my speakers, my mouse drivers broke so I had to put it into a different port, and I have another defective PCI wireless card. So my question is, how would I fix my speakers? The speakers are in my monitor and what it's usually named is Realtek HD Audio or something but now it's named High Definition Audio Device. Are there any fixes I can try? Or is more information needed? Thanks!

Question by knexpert1700 


Has anybody attempted this project before?

I got a 1952 RCA console TV I have Gutted the old CRT and chasis. I am going to replace the CRT [ TV TUBE] with a computor monitor and a cable box. I'll drill a front door peep hole viewer in front of the cable box IR sensor for remote control. I make a new custom trim plate for the new " picture tube" and I would like to use the old 8" speaker. Monitors have a more square shape than LCD TV's which is closer to the round tubes of the fiftys. Using a cable box would allow me to place the Peep site where I want it with relation to the cabinet.

Question by    |  last reply


Mobile phone signal Detector

I want to know if there is any 'mobile phone signal detector' already available in the market. The purpose is to find if anybody is using mobile phone for calls or messaging at restricted places. Jammers are not fine as some are exempted from making calls etc.. If there is nothing like that available, how to make one to detect the signal or even the phone from which the signal was emitted. Usually when we are about to receive a call or sms and if we are near a Speaker we get a specific noise through speaker, or if we are near a monitor (CRT) it flickers.  So I am sure there are ways to find this signal emission. Please suggest the options to do this....

Topic by donjoy   |  last reply


Building: wireless monitor/tablet recycling old laptop parts

Please be positive and constructive with your questions and comments.Building wireless touchscreen ar1100 to bluetooth transmitte by Fearlessleader on Tue Mar 20, 2018 5:04 am Hi I have 15.4 samsung laptop screen I am converting to 4 wire touch overlay and want to us the ar1100 but need to go from the usb out bluetooth wireless mouse transmitter. I would need the same type of transmitter like any bluetooth mouse would have inside. The mini pc I am building has both bluetooth and wireless display.Parts list so far15.4 samsung screen pulled from a Dell laptop modle LTN154W1-L01Control board for the screen with hdmi ebay 30$ link https://www.ebay.com/itm/HDMI-DVI-VGA-LCD-Lvds-Con.. 12v 3 amp power supply for the screen controler I already have but later I would build voltage control unit that would charge or power the whole unit. Again YouTube has videos and links for the part for this. And I really don't want to have a bunch a supplies to run it. While prototype it I will the final will run from the laptop I got the screen from. It should plenty of power for a single board computer like the new pi 3 to be added and the audio amp15.4 4 wire overlay conversion many sorce's about 50$ link https://www.ebay.com/itm/15-4inch-4-Wire-Film-to-F... $Ar1100 touch to usb mouse adafuit 10$ link https://www.adafruit.com/product/1580Hdmi wireless receiver. 20 to 40$ depending on features like if it has chromecasting and such I just need video so I think the 20$ unit will do nice. These can be found in many places, so I would think this to be open end item depending on features the builder wants. I would buy the best you can afford to leave it fexible .The last thing I need to make work would be usb transmitter to make the ar1100 bluetooth or matched pair of 2.4 dongles usb this is the only item missing. I could test the whole set up but would have run 1 usb cable, but that's a deal breaker for full wireless... If I had a old bluetooth mouse and knew how take its transmitter out, that work but a bluetooth usb adapter the would plug in the ar1100 board would be the thing I need.If someone would know how to remove the mouse transmitter and wire it to male usb plug I would be happy to buy it. I real want this to made from as much recycled parts as possible.I just don't want to have run a usb cable from ar1100 to the pc.I don't think the same usb dongle that's used to the pc is the same as the one used in every bluetooth mouse or keyboard. That's my idea for a wireless touchscreen handheld All the parts are easy to get I just need make the ar1100 usb board and wireless usb transmitter. The pc would use GA-h77n-wifi mini itx as it has both bluetooth & wireless display and wifi.Part 2The idea sound lol! I want to build a frame for the screen with speakers and laptop battery and used the power supply from the Dell laptop I got the screen from, that would need a small amp. Since the receiver is hdmi, I would think the audio would be there if not that would be simple to just use a bluetooth stereo headphones and run the earphone wires to the small audio amp.I would like any comments on this idea and a sorce the one part that missing the usb mouse transmitter for the ar1100 and this could be built.So What do you folks think? A portable monitor 100% wireless that could even double as touchscreen remote! I even thought down the road to add the new pi 3 to it as that would completely independent as low power tablet or connect to the pc that nvidia gpu and could stream pc games to My Nvidia shield too. With all the power of I7 2700k oc to 4.2ghz.The possibilities here are endless you and all kinds a features adding a mic and Webcam for video calls with sckype or google voice and messenger and bingo u have a voice and video over IPThis do able you think?All comments good or bad give to me straight.Oh but go easy on the grammar thing. I technology geek but a 56 year old high school drop out. But hay at 37 I was disabled with fractured spine by time I was 40 I did all computers repairs for my local high school and was building white box computers out of my home office. If there is 1 thing I have learned in this life anything is possible but you have to try!Please be positive and constructive with your questions and comments.

Topic by Fearlessleader62   |  last reply


A weird ringing sound from my computer?

Ever since I built my gaming computer, my HP monitor which has speakers in it makes a ringing sound. What is weird about it is that when my CPU is occupied for a second or two (Like opening Google Chrome), it stops and when it is done processing that it starts back up. It also stops when I lay my mouse over certain things or put a drop down list. It's a very high pitch sound that everyone I ask says they don't hear anything. However, I can hear it like one of those old chunky TVs that make a high pitch sound on start up. It's very distinct to me and it's annoying. I know it is my speakers making the sound because whenever I unplug them they stop making the sound. Any possibility? Motherboard malfunction? My speakers on plugged into the green port on the back of my computer. Thanks!

Question by knexpert1700   |  last reply


how much weight can mdf support? Answered

I have a table i built from an instructions on here. but the legs arent that sturdy. so i was going to put new legs on ikea ones and replace the wood ones. i was wondering if i need support beams.its a computer desk 2 monitors keyboard mouse and 2 medium speakers or should i not worry about the weight and it will be fine without the beams? the board is 2x4 ft mdf the legs are about 27 inch tall

Question by nightninja87   |  last reply


Designing a Contemporary Computer Desk

Hello everyone in this wonderful community! I want to share something to see what you think about it! When I finished high school in February last year, my family gave me some money as a present. I put all that money into my new computer. However, I had no other place to put my computer than my work desk. I need this desk for many other things, such as airplane modeling, drawing, designing, soldering, and such. Therefore I have to get a separate desk for my computer. I always enjoy making stuff myself, so I thought that I could design my own desk. So, this is what I came up with. The desk I have designed has a contemporary, extravagant look, and is NOT designed to save space! It will be made of MDF and have a dark glass top. No drawers or shelves needed, except for the keyboard and the mouse. It will be wall-mounted. The MDF will be painted black. I have made the design in AutoCAD 2007 in 3D to see what it will look like, these are the renders I made, of the complete desk, of the structure, and of the pieces needed.  --------------- I am not sure of the thickness of MDF and glass that I should use, or if the structure is too heavy or too weak. (I have a desktop computer, not a laptop) Please help me with this part! --------------- If I ever build this, I will make an Instructable of it! Please take your time and say what you think of the design! I will greatly appreciate it!

Topic by colorex   |  last reply


More than one computer on a single CPU? Answered

Ok, at this place I go, there is a set of 4 monitors all connected to one "Computer" but they are all seperate computers. There is 4 seperate keyboards, mice, and speakers. They are all connected to the computer by network cables. It is interesting, I was wondering if anybody has ever heard of this before, b/c I want a program like this. Actually what I was looking at was a ncomputing thin client, but If anybody could help me think of a cheaper option because these cost about 1100 per terminal box (i need 3-4)

Question by bwpatton1   |  last reply


Make a magnetic field detector ?

I dearly want to make a device to measure electromagnetic fields in the house ,since the presence of such has been more than obvious and at times annoying . My CRT monitors behave strange in my room . The geometry of one bends as i turn the monitor in one direction and at the same direction ,my spare one changes color to blueish like pale . Interestingly, they do it in the same direction no mater where i put them in the room . My turntable's (i am in to Hi-Fi gear ) cartridge reacts when i put it in some places in the room and i hear noise come out of the speakers until i reposition the turntable . Anyone have any ideas how i can locate the source ? Some simple device ,or schematic that will give me the ability to measure ,or at least detect to some degree the fields responsible ? Will be thankful for any answer .

Topic by soundsmyth   |  last reply


PS2 to PC ???

Hey there, heres my problem, i have a PS2 and a computer, i only have 1 tv, it's in the living room and always in use, thus i can't use it for my PS2 but my computer could be used for such IF i can find a way to make, or if i have to, buy somthing to connect the PS2 to my PC so i can use my PC monitor and speakers to play my PS2. i would deffenantly prefer to make something though, just cheaper that way cuz i think i would have all the parts already. if u can help me out it would be greatly appriciated and if not then thanks anyway i appriciate the effort.

Topic by chaos1620   |  last reply


Which Mixer / How many channels do I need

I am starting out to help some friends that have formed a band. Their Setup so far is, 2mics, Lead and Backing Singer, Acoustic Guitar with jack output to Amp, and Keyboard with mono Jack output to Amp (thats what we use at present, stereo output is available). and 2 x 300 watt speakers. I want to add an Audio Power mixer which will allow the addition of 2 stage monitors and another 2 mics in time. Any recomendations? How many channels do I need etc to allow me to use the present equipment and then add as time and money allows. Thank you in advance.

Question by MarkEast   |  last reply