Audio input switch

I need this simple device, because i have two audio interfaces (one for guitar recording and one for vocal recording) and when i change audio interface i need to disconnect output cable, of first interface, from my monitors and then connect output cable from second interface to my monitors. So with this I can choose between two different stereo audio inputs and send one of them to output. I am using TRS connectors, but i will also need XLR version of this. Check out this picture:

Topic by Necrofenser   |  last reply


automatic headphone audio switch

Does anyone know how to make an item that will let you plug in multiple 1/8" sources (radio, ipod, phone...) that auto switches to a single output by sequence, so the ipod is playing but when a call comes in the audio from the phone makes the switch bypass the ipod till the call is done then goes back to the music? i would love to get some help with this thanks Jake

Topic by jakehooks 


What are internal switches? Answered

I've been searching out parts on digikey, and noticed that a lot of the power/audio jacks had an "internal switch", with three conductors and four contacts.  I've never heard of these before, and none of the datasheets were helpful, nor ten minutes of googling, in educating me.  So what are these mysterious internal switches?  I presume they somehow switch between two states depending on if there's a plug in the jack.  But why is this helpful or necessary?  And more importantly, how does this affect how to wire the jack?

Question by Skidion   |  last reply


Audio - headphones

My daughter runs a Pre-school and uses a small cd stereo setup. The output is a pair of mono jacks (R/L) for speakers. I am looking to build a distribution box for up to 6 headphones. Thinking of one input (from the speaker jacks using a 2 to 1 plug) The headphones are mono 1/4 so those jacks are readily available. I do not know what the output is of the stereo system is but I doubt it is much over 5 watts (if that). Will I need some sort of amplifier? any thoughts on switches/switching jacks if not all are being used. Thanks for listening. guitar 52

Topic by guitar 52   |  last reply


Audio chip? Answered

I want to make a device to play a sound when a PIR sensor detects motion, but I don't know about the audio chip. I can't seem to find a chip that allows you to program a sound clip to it, then output it when it is given a signal. The closest I found was a cheap sound recorder module from china, but it contains all the external components (mic, batteries, speaker, switches) and so it acts just as a voice recorder. I need an individual chip that will do something similar. I may use the module as a prototype, but I eventually intend to mass produce the circuit, so that is why I am looking for an alternative. It only needs to hold about 5 seconds worth of audio, medium quality.

Question by andy70707   |  last reply


Auto switching 3.5mm circuit

I currently have my phone connected to my car stereo via 3.5mm audio cable on the aux input for music playback I would also like to connect my UHF radio to the car stereo as the internal speaker is not very loud/clear. I would like it set up so that the music is playing and it auto switches to the UHF when someone is broadcasting. I'm not sure if such a thing is possible (DIY) or if a product existing on the market already. I would appreciate any help on the subject Cheers 

Topic by aparks   |  last reply


broken beam switch for audio loop?

I  want to have a set up that play a message or sound every  time a light beam is broken.  how should i do this?

Question by instructarnie   |  last reply


build a switch that will automatically switch back and forth between an mp3 player and a cellphone.

I'm not looking for detailed schematics (though that would be nice) but a general idea as to how to go about it.  I was thinking transistors as switch but I would have to self educate as my experience with electronic schematics and design is virtually nil.   Any help is appreciated.

Question by inferno493   |  last reply


how do i use the DPDT toggle switch, and have two audio input and one audio output

I would like to use it to have to audio input and have one output to my amp

Question by KdogK   |  last reply


7.1 DIY audio switch, please help

Dear Instructables community,I stumbled on to this site while looking for a DIY solution to a problem where no commercial alternative seems available. The problem? I need a dual input/output switch for my 7.1 audio system.What I found on this site was: https://www.instructables.com/id/35mm_51_Surround_Sound_Switch_Splitter_Box/I'm "OK" with a soldering iron, but I've never really built anything before, and I'm not familiar with some of the terminology. Really, the only things I have done in the past have been soldering plugs on the ends of wires and re-soldering loose connections. Even so, I'd like to build something similar but for 7.1 with dual inputs and outputs.I'm hoping you can help me make the right choices building this.My original plan was going to be just like the 5.1 version with a few most switches, but instead of the input 3.5mm jack as the source for the switch, I would just connect another switch and then connect it to two 3.5mm jacks.(See attached image)Will this work without taking a hit in audio quality?Is there an easier or more efficient way of doing this?Here's the hardware I selected initially:Switches: http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId;=10001&catalogId;=10001&productId;=76260&3.5mm jacks: http://www.allelectronics.com/make-a-store/item/SMJ/3.5MM-STEREO-PHONE-JACK-W/N.O.-SWITCH/1.htmlI don't understand most of the terminology on these parts, but they look like they should work.Please let me know what you think, I'm open to advice.Thanks!

Topic by Oriknama 


wireless switch for CFSound III

HelloI would like to use the CFSound III http://is.gd/2IDt (so can record own sound) but activated by a wireless switch on a door for when it opens. They don't make one.We be grateful for either online store for purchase or instructions for making/hackingbestm

Topic by greenface2222 


Problem with audio-cables/soldering

I bought sum cables (dual-lines) and want to solder stereo jacks, but then i found out that a phone jack got three points to solder although there are only two cable-lines leavin the jack - i would like to know how to solder that. The project is: We got a flat share here and i wanted to connect all computers (that got stereo jacks) with a switch (4 connectors per channel) and connect the switch with a pair of boxes in our kitchen so that we can chose the line in from the switch and not have to pump up the volume in our rooms to listen to our music while being in our kitchen; so there's 3 computers[stereo jack out] -> [4 line cable-ins]switch->[4 line cable outs] -> [not defined in; eventually stereo jack outs->stereo jack in-active-]boxes and i got this dual-lined cable (solid twisted copper; 100meters-spin), a pack of each kind of stereo jack plugs. What do i do to get sound?

Question by Luziviech   |  last reply


Is there a way to change betwen two 3.5mm audio ports with only one switch? Answered

[404:details not found] Is there a way to change betwen two 3.5mm audio ports with only one switch?

Question by Ro_Usr   |  last reply


Audio Stereo KILLSWITCH without NOISE when switch pressed

I know there's a lot of Killswitches to build but I need one that will shut my loud music gentle without the "unplug" noise, may be some components attached to the switch will make it. Any suggestions?

Topic by luisnperez   |  last reply



Audio switch with four inputs and push button toggle?

I'm looking to create a device similar to this instructable: https://www.instructables.com/id/Audio-switch-2-inputs-1-output/ However I need four inputs and I would be using a push button as the means to jump between inputs. If I could also have some sort of indicator LED that would be helpful. Not quite sure how to tackle this project.

Question by Nameless37   |  last reply



Single Audio Input to dual input

Hi, I have an amplifier that only has one input, but I was hoping to have a bluetooth connection, as well as a 3.5mm audio jack. I was wondering if there was a way that I could do this? and that preferably it would switch automatically based on which is being used?

Topic by Fozzibehr   |  last reply


Bluetooth adapter for car audio

Dear all, I have a Skoda audio system integrated into my Skoda which has a cd reader plus a cd changer, but  only a CD button(no AUX available). I would like to stick inside the audio system a Bluetooth receiver so I can listen to music stored in my phone. The goal is to solder a Bluetooth receiver to the audio system without loosing the cd functionality. On top of that I would like to be able to change from one source to the other without having to use an external button like a 3PDT switch. Thanks in advance, Pedro

Topic by pcardoso73 


I want to build a 1/8" audio selector box with 4-5 inputs and 1 output.

I want to build a 1/8" audio selector box with 4-5 inputs and 1 output (i.e. 4-5 audio sources and 1 set of speakers) and be able to toggle amongst the sources.  I bought a 2 Pole, 6 position rotary switch: Will this work, or should I get something else? other recommendations welcome!

Question by ngaaih   |  last reply


Ipod sync and audio cable mod

Hello, I've been thinking about making my own iPod dock build into my desk. One of the features I would like is that I can also listen to music while it's docked without having to put an extra cable in the top.  Now, I know cables exist with both USB and stereo line out connectors. So this should be possible.  However, since I want to work the cables away it is gonna be plugged into the USB port of my computer all the time.  I'm not 100% sure on this, but I'm guessing that the iPod will go to sync mode once I connect it without the ability to play music before ejecting it in iTunes.  What I want to do is make a toggle switch, so I can choose between sync and charge or audio (or better even, audio and charge if this is possible) My guess is that the best way of achieving this is to put a toggle switch on the data+ on the USB line, since the iPod can no longer recognize the computer like that (and therefore will not go to sync mode) Am I correct in this? I am aware that it will not charge this way because of the voltages needed on the data pins for charging.  A better solution would be to switch both data connections from the standard USB connection to the voltages needed for the iPod to charge (causing it to still charge in audio mode). However, I'm not sure how easy this would be to achieve with only 1 toggle switch (since I need to change 2 cables without shorting them out). I know the voltages and resistors needed (they can easily be found here on instructables or other sites through google) but the switch is what is bugging me.  It would be nice if this can be done without microcontrollers (I never used them so yeah...) If I need to build a circuit that is ok (soldering isn't the problem, I just don't feel like learning to program a microcontroller just for this project) Can someone please tell me the best way to achieve my goal, and if it's possible at all. 

Topic by Ganoderma   |  last reply


building a HD Audio front panel for my PC. Audio circuit?

Hi! I have problem with my computer. the motherboard has HD-Audio but the front panel is the usual AC97 standard. You can change the BIOS config so the front panel audio connector acts as an AC97 one, but then the problem is the speakers connected to the back keep playing even if you connect a set of headphones to the front panel. The reason is the audio jacks used for HD-audio are different from regular jack connectors (and very rare to find!). While the insertion of the plug in a regular jack connector results in breaking a circuit (and so, physically muting the loudspeakers), in an HD Audio jack, the insertion of the plug results in closing a switch (sending a signal to the driver ordering to mute the speakers by software). I managed to create a sort of HD audio Jack by combining a regular jack connector and a zero pressure micro-switch so when the plug enters the hole, a tip inside the hole closes the micro-switch. I wanted to make a good quality front panel so instead of just wiring the jack connectors (and micro-switches) to the cable, I decided to add an EMI filter. I took the circuit from this doc: http://www.formfactors.org/developer/specs/A2928604-005.pdf and more precisely from fig 6 at page 25. The circuit uses two 220 pF capacitors and two inductors for each jack connector. In this aspect the circuit is identical to that proposed for AC97. The problem is I have no idea what inductors to use or how to ask for them at the shop. All the diagram says in a footnote is: ZL should be 600 Ohms or greater @ 100MHz with a low Q (broad Impedance curve over frequency) but not even the guys at the shop knew what piece to give me. So what I did was to cannibalize the inductors from two cheap promotional radio receivers with jack connectors for the headphones and use them for my circuit. After all, they perform the same function: filter the audio signal at the headphone connector so I supposed they should have the correct values I needed. But my circuit is very noisy! headphones have a constant electronic background noise (that seems to react to things like mouse movements, hard disk activity or whiteness of the screen) and microphone has a lot of noise (of course I'm using very good quality mic+headphone). The cables are audio cables for front panel audio so they are supposed to be correctly shielded so the problem is in the circuit at my custom board. I would like to make a tutorial (including HD Audio connector construction) once the front panel is working properly but I don't know how to fix it. Any ideas?

Topic by jedikalimero 


Audio Spectrum Analyzer Headphones

Hi, I was wanting to try to make some custom headphones. The headphones themselves wouldn't really be anything special but what is on the sides is what i'm wanting. On the sides I was wanting LEDs in a circular fashion working as a spectrum analyzers to what ever music I play. A visual idea of what i'm wanting is the GIF below, the way the analyzer is working in the background is how id want it on the headphones except in the opposite direction where the bars go outward.I also would like to have it to where it had a switch where i could turn the analyzer off but still listen to music without it running. I don't care on how it works i just want it to not be too expensive and i want it to where it could look a little professional and clean

Topic by SteelShadow104   |  last reply


building a HD Audio front panel for my PC. Audio circuit? Answered

Hi! I have a problem with my computer. the motherboard has HD-Audio but the front panel is the usual AC97 standard. You can change the BIOS config so the front panel audio connector acts as an AC97 one, but then the problem is the speakers connected to the back keep playing even if you connect a set of headphones to the front panel. The reason is the audio jacks used for HD-audio are different from regular jack connectors (and very rare to find!). While the insertion of the plug in a regular jack connector results in breaking a circuit (and so, physically muting the loudspeakers), in an HD Audio jack, the insertion of the plug results in closing a switch (sending a signal to the driver ordering to mute the speakers by software). Since I can't find this kind of jacks anywhere, I managed to create a sort of HD audio Jack by combining a regular jack connector and a zero pressure micro-switch so when the plug enters the hole, a tip inside the hole closes the micro-switch. I wanted to make a good quality front panel so instead of just wiring the jack connectors (and micro-switches) to the cable, I decided to add an EMI filter. I took the circuit from this doc: http://www.formfactors.org/developer/specs/A2928604-005.pdf and more precisely from fig 6 at page 25. The circuit uses two 220 pF capacitors and two inductors for each jack connector. In this aspect the circuit is identical to that proposed for AC97. The problem is I have no idea what inductors to use or how to ask for them at the shop. All the diagram says in a footnote is: ZL should be 600 Ohms or greater @ 100MHz with a low Q (broad Impedance curve over frequency) but not even the guys at the shop knew what piece to give me. So what I did was to cannibalize the inductors from two cheap promotional radio receivers with jack connectors for the headphones and use them for my circuit. After all, they perform the same function: filter the audio signal at the headphone connector so I supposed they should have the correct values I needed. But my circuit is very noisy! headphones have a constant electronic background noise (that seems to react to things like mouse movements, hard disk activity or whiteness of the screen) and microphone has a lot of noise (of course I'm using very good quality mic+headphone). The cables are audio cables for front panel audio so they are supposed to be correctly shielded so the problem is in the circuit at my custom board. I would like to make a tutorial (including HD Audio connector construction) once the front panel is working properly but I don't know how to fix it. Any ideas?

Question by jedikalimero   |  last reply


Do audio devices put out alternating current? Does the current ever switch itself?

Hi I'm making a prop Geiger counter for Halloween, and i was going to have bi-polar LEDs on it depicting if it is safe or not to proceed. I have worked out all the main issues with making a prop Geiger counter, Producing the sound, amplifying it, and distributing it. I was going to have one channel of my MP3 player play Geiger counter clicks and the other  channel square waves to drive a transistor to drive the Bi-polar LEDs I was going to have Red LEDs light up to the positive part of the wave, and the Green to the negative. This is where i ran into a small problem, i don't really remember if Electronically produced sound waves have both Parts of a wave (look at the picture), or of it just produces a positive pulse without reversing polarity. I will be using a computer speaker amplifier for this project Thank you! (basically, i need to know if Computer speaker amplifiers produce AC current)

Question by Sandisk1duo   |  last reply


Audio Priority Switching Circuit. Can not find a schematic that will fit my need

I have searched but came up empty. Here is the need. 2 audio lines coming in. 1 is on all the time. when audio is sensed on line 2, it will reduce (or turn off) line 1 allowing line 2 to take priority. Then when line 2 stops, (mobile radio traffic) it switches back to line 1. The challenges: Small as possible (and yet I can still solder together) runs on 5-9V DC Adjustable gain on inputs Sensitivity adjustment on "switching" function Of the hundreds of circuits I have looked at, It seems to be a fairly simple task with a FET ......  I can build it, but the design portion is a to much math for me..lol  A 3 audio switching circut would be AWESOME!!! Anyone seen anything out there that will help me in my search??? Thanks, Steve  

Question by Sadputter   |  last reply


stereo audio amplifier lm386 (i need some help)

Any ideas if this would work (i'm a total noob on this) red=negative blue=bass boost black= ground any suggestions on how to: make it work? make it sound better? louder without distorting?  make it more suitable for mp3player/ipod? how to add (and where to put) high and/or low pass filter? the 10k log pot should serve as volume control (hope that's correct XD) my jack's all wrong i need 1/8 stereo jack....so how do i put that ? how many watts for the speaker?     is a 9 volt enough to power this ?  would the switch on the bass boost work?

Topic by markuy45   |  last reply


Technology of the Tube Screamer

Some time a circuit Screams wrong as this foot switch flipflop I can see the arrangement if the design wanted independent control but that would allow a lack of signal.

Topic by iceng   |  last reply


value of a potentiometer to attenuate amp inputs?

I have three 'sources' of stereo audio fed into my NAD amplifier. Each source has a different (non-adjustable) output level. So when I switch each one at the Amp input selector the output volume changes significantly. I just want to attenuate the two highest outputs with a trimpot at source before inputting to the amp, so that each are roughly at the same level. Any idea what value trimpots I can use?

Question by barrykap   |  last reply


Remote shutter - Transistor madness (or some other sort)

Hi all, I'm trying to build remote shutter for my camera. Intervalometer to be exact. That doesn't really matter. I have this page http://www.robotroom.com/Macro-Photography-2.html describing how to make a simple remote shutter. The schema is simple - trivial. However, instead of 2 physical switches, I'd like to control it using audio signal from my smart phone. I'm a programmer and I can make an app that will output signal of any volume and frequency. I'd like to control these two switches using this signal. Those switches provide 4 positions, however only 3 are needed - nothing, focus, shutter. Can anyone adjust that schema, add (probably) transistors or some other parts if needed to make this happen? Remote shutters for other cameras (Canon, Nikon, Pentax, ...) work in similar way, so similar schemas can be derived to serve whole range of digital SLRs. Motivation: I don't want to buy costly and redundant intervalometer, I can create nice app for Android which can work together with just small DIY piece of analog circuit to create wonderful timelapse videos.

Topic by skrat 


LF Help on Audio Input and Output

Looking to build an 'audio switch' for my devices on my network or have a circuit board to have on my desk. I have 5 computers (windows/mac/linux) I run at any given time, some used for Skype, Youtube, Music, and/or Gaming. I am looking to make something that I can connect up with 3.5mm sound and mic jacks to a main board and controlling the input and output to different speakers and headsets all on 3.5mm.  Ideally I'd like to have volume control on the board itself, but isn't required. Does anyone know of a instrucable already made?

Topic by AlexR32   |  last reply



Will a condenser mic work the same way as a 3.5 mm mono audio jack? Answered

I will be building an FM transmitter soon, and I wanted it to have a condenser mic with a switch that switches the input of the condenser mic, to the input of a jack that people could play music from. In other words, the user would be able to speak to the transmitter, flip a switch, and then play music through to the jack. My only question really, is whether or not it would work? Thank you for taking the time to read this, I really appreciate it. The attached picture is the schematic I am working off of.

Question by XBLmonster   |  last reply


Should i switch to Windows Seven? Answered

 I'm currently on xp, i have a 2nd drive to make it easy to transfer data and i play A LOT of videogames (team fortress 2, halo. etc...) so i want to know if i should change to seven. I want to know if i will be able to play Call of Duty 4, and a bunch of SOURCE engine games on that OS, would running both a heavy OS and the game could lower my FPS? No problem with the money, as i will just warez download it. (trusted source) MY RIG: Tipo de procesador DualCore Intel Pentium E2140, 1600 MHz (8 x 200) Nombre de la Placa Base ECS 945GZT-M (2 PCI, 1 PCI-E x16, 2 DDR2 DIMM, Audio, Video, LAN) Chipset de la Placa Base Intel Lakeport-G i945GZ Memoria del Sistema 1536 MB (DDR2 SDRAM) Tipo de BIOS AMI (04/09/07) Tarjeta gráfica NVIDIA GeForce 9400 GT (1024 MB) - I think it will run Aero. C: (NTFS) 76316 MB (5194 MB libre) D: (NTFS) 38201 MB (8029 MB libre) I could also reinstall XP, would you suggest this over switching to seven?

Question by santy22   |  last reply


I need a circuit diagram for a simple piezoelectric audio buzzer and led light flasher in one handy circuit board?

 Hi, I am trying to build a simple circuit that has a piezo electric buzzer and an led light flasher that runs on a 9V battery. The idea is that, this circuit is a wearable (a necklace prototype) that acts as an alert system - the circuit needs to be compact. All I want for it to do is, with the flip of a switch, the buzzer sounds and the LED light flashes. I am a beginner when it comes to building circuits. Can some one please provide me with a circuit diagram? Thanks for your help!

Question by gbal   |  last reply


What is a good chip (IC) for audio switching to more than 2 inputs/outputs?

I'm attempting to make my own multi-room audio system. I realize there are paid systems out there, but they get really costly when you go beyond 2-3 rooms. And I'm doing it the old fashioned way of running all the wires to and from one place. The catch is I want to be able to do the switching remotely, ie no buttons or manual switches. I can set up something to send the signals to do the switching, my problem is I'm not sure what is the best way to handle the switching of the audio signals? I've read on a few sites that you can't just use any IC for audio signals. But the ones they recommend are only for 2 way splitting and I obviously need more than that. The plan is to have 8 inputs and 8 outputs. Only one input can be connected to an output at any time, but it also needs to be able to connect to more than one output (up to all 8) at the same time. And be able to handle other inputs being active and going to other outputs at the same time. Ie I'm listening to music in 3 rooms, and my wife is listening to different music in another at the same time. I go into another room and switch my music to the new room, without interrupting or interfering with what my wife is listening to. The IC used in this guide seems like a good starting point, but I need something a bit more advanced. I know there's gotta be a better IC out there for doing what I want, I just don't know enough about electronics to know where to begin? Any help would be greatly appreciated. Wireless, wi-fi, streaming, etc. is out of the question because I have yet to see a system that 100% of the time does not have a delay between 2 or more outputs. Hence why I am running wires. FYI I know basic electronics like what things are and I'm not afraid of soldering. And ofcourse I do plan to put my finished product up here as there is a lack of any mult-room audio projects.

Question by HighWing   |  last reply


Standard picture frame that plays a short piece of recorded music

I'm looking to attach some sort of audio playback device to the backside of a standard wall-hanging picture frame. I have the audio as a 30-second MP3 file and ideally someone would be able to walk up to the frame and push a button / flip a switch and the audio would play once through some sort of speaker - quality doesn't have to be great. Pushing the button again would make it play again. I've never built anything like this before and I'm not really sure where to start. My first guess was maybe to take apart a music greeting card, but there's no button to play with that. Anyone have any ideas of what I could do? Thanks.

Question by schwars1   |  last reply


Any suggestions for turning a MIDI file into a dog barking? Answered

I know the Casio SK-5 keyboard had a dog bark sampling, but I can't find any other keyboard that does, nor do I still have my Casio SK-5... I'm open to ideas/suggestions.  The easist way would be using a program like Garage Band to switch the instrument, and to have a sampling of a dog bark, but I don't know if this is possible or not.

Question by yokozuna   |  last reply


Need a very simple wireless two-way audio communication device.

Hello, i need  a simple wireless two-way audio device for communication within the house. i like to have a small device like a tiny headset, that is simple and has good range. i wish to make this really cheap, under 200 INR. mainly for audio communication (full duplex communication). here, where i live, i don't have access to any good technology. i mean, i cant even get simple "variable capacitor". so i have to purchase anything online, but the shipping rates itself to my place are too high for my budget. i have seen circuits like "fm transmitter" but i need a "fm reciever" to pickup that signal. but fm recievers are hard to build. i even made a fm transmitter( a very simple one), but it often switched the frequence, so i couldn't have a fixed frequency.  so i look for a circuit that is easy to tune and can be fixed frequency. i came across this module "433Mhz RF Transmitter Module + Receiver Module Link Kit for Arduino" but i done know anything about  arduino.  if i can use this module to make a two-way voice communication, please guide me how to. if not, please give me other ideas.

Question by jaga0692   |  last reply


i built this circuit and its not working, help? Answered

Recently, i found a audio amplifier chip, the TDA7496 to be exact. when i found its datasheet, it included a circuit for a audio amplifier. i built that circuit, and it made my music quieter, not louder. the sound level didnt change even when my input device was at max volume. (my laptop) i tried the volume adjuster and it did work, but only to lower the volume, not raise it. i followed the circuit, the 'mute' and 'standby' switches were hardwired to the 5v points, like the circuit shows the switches being at default (off) the SGND seemed to be connected to PW_GND (tested via multimeter) internally, so i added a wire to ground externally to be careful. im using a 15v power supply, and a 5v regulator. i assumed all the down pointing white arrows were all to be connected. capacitors 2, 3, 5, 6 and 8 were not put in. i used polarized capacitors for 9 and 7. all of the capacitors are rated for 16v. i tried disconnecting the mute and standby lines, but that didnt change anything.. so ive attached the circuit in question, can someone tell me what might be wrong? i have also attached the datasheet.

Question by zack247   |  last reply


can i use a micro controller to switch audio or will i need to also use relays? Answered

Hi, I'm thinking about making an audio linked house (each room can listen to music playing from another) (for details read my other post) basically all the rooms are going to be linked to a central switcher witch will have a micro prossesor in it, maybe an arduino or pic. my current design uses a whole load of relays connected to the digital pins via a transistor. i was wondering if there was an easier/simpler way to do this, maybe direct onto the micro prossesor?

Question by ljarrald   |  last reply


Want to convert TV audio to headphone or speaker. What impedance transformer ratio is reasonable ?

Present speaker is 14 ohm. I tried a 1000 ohm to 16 ohm, it cut output to speaker by 75%. Thinking I need 1:1 transformer and probably impedance is not critical as long as it is 50 ohms or less. I will be switching between earphones or speaker. No fidelity requirements.

Question by willsonx   |  last reply


Video Switcher Mod

Hello, I'm working on a light/video setup for my friends' band. One component is a video switcher I want to trigger by the snare drum; contact mic into one of these amplifiers into the select button on the switcher below. My question is about the easiest way to modify or replace the switch so that it operates on the signal from the amp instead of the mechanical pushbutton. I don't expect that to be simple... another option is to wire up a small motor that simply pushes the button from the outside. The other component of the project, anyway, involves more contact mics to amps to light organs, to visualize the drums. That part is a little less worrisome, although after investing in a lot of parts I made the mistake of seeing what the same money could've gotten me at guitar center... oh, man...This is my first post. Thanks a lot for any and all ideas!

Topic by cameraeyes 


plan for a soundboard? Answered

Im trying to make myself a soundboard because I'm tired of having speakers that are not compatible. i would like to have a 3.5 mm audio jack and RCA audio inputs. Switches so i can choose which input I want to use. I then want to have a 3.5 mm audio jack, RCA audio, and bare speaker wires as outputs. I also will need an amplifier for when the input is a an IPOD for example. And to amplify the sound through the bare speaker wires. I'm not exactly sure how to wire it all but here is my plan. 

Question by chance633   |  last reply


Speaker headphone disconnect for mP3 player with amplifier and headphones

Hi, I am working with a Flyron FN-M16 MP3 player module which has both output for headphones (pins 4,5, and GND = 7), and a 3-watt amplifier for speakers (pins 6 & 8).  The problem I am having is that I am unsure of how to disconnect power to the speakers when headphones are plugged into the jack.  This is easy when you have a separate amplifier circuit, but here the amplifier is built in. The easiest solution would be to find an audio jack with an isolated NC (normally closed switch) to disconnect the speakers.  They do not seem to make them in SMD packages.  I have found a 3.5mm stereo audio jack with an isolated NO (normally open) switch from Technik.HK.  Is there a mosfet type circuit that I can use to disconnect the speakers when the NO switch is closed without introducing any distortion to the speaker sound?  Any advice for an electronic disconnect?    P.S:  The manufacturer has stated that if I ground the speaker outputs for the 3-watt speakers I will blow out the internal amplifier on the flyron Mp3 player board.

Topic by Meek_The_Geek   |  last reply


Audio: 8 hours of Amory Lovins lectures

Video with slides http://www.rmi.org/sitepages/pid231.phpmp3 audio only http://sic.conversationsnetwork.org/series/si-energy.htmlAmory Lovins runs the Rocky Mountain Institute, working on cars made from thermoplastic/carbon re-formable body panels among other projects.He's a charismatic motivational speaker on the subject of energy solutions. Listen to this stuff to get enthused again after you get burned out by hearing about what our idiocracy is doing to us and the world. It's a really it's nice to hear him saying that thetechnology solutions exist and all our dreams will come true once we switch tothem. And this crisis is just the thing to get us off the dumb old methods thatare only used from habit.

Topic by TimAnderson   |  last reply


Arduino LED matrix for text and a audio spectrum?

Still running off my daft punk helmets, I had the idea of installing the ability to give the 8x40 LED matrix that will be installed into one of them the ability to be a real-time audio spectrum. Doing that on its own is something I can stumble through and get working, but my issue came in with the fact I also want to be able to change it to be able to display text. I'm thinking I can "change modes" between using some sort of EQ shield/setup to run the matrix verses pulling info for text, but this is one of the dark areas for me that I need a little bit of help on. Basically: I need to know if I could set up a switch to swap between EQ and text.  EDIT: I've already answered my question! However, this lead to a second question. If I use this code, how hard would it be to edit it to either duplicate or stretch it out over an 8x40 LED matrix verses the 8x8 its on? Thanks! 

Question by DoctorWoo 


Bypass PC Speaker remote?

I have a 5.1 speaker system that has been laying around for ages because the remote stopped working and that is the only way to switch on the amp. When its plugged in, it stays on standby until the power button on the remote is pressed. The remote also had volume up and down. Now unfortunately the remote is also gone and I would like to know how its possible to make the amp stay on permanently so that it will be on as soon as it is plugged in.

Question by kokaine   |  last reply


Wiring question?

Hi everyone. Long time visitor of Instructables, made a few items I've seen and my most recent project was adding a star power pedal to my guitar hero controller. I bought a audio extension cable with a male and female jack, 1/8th size. I cut the cable about six inches from the female end. I stripped about an inch, inside was a bundle of copper wire wrapped around a clear insulted wire. I twisted the exposed copper wire and tinned it, I stripped the clear housing and twisted it, tinning them as well. I tinned the exposed wire to the GND, and the clear to Select. Positioned the jack and everything went well. I took the male cable, connected it to momentary switch and connected the male cable to the female jack. Turned on the system and controller. Got star power and hit the switch with no response. I'm very confident in my soldering and know I did it correctly, so I was wondering: 1) Are these kind of cables capable of doing what I intend? 2) Maybe the GND or the Select button are shorted out on the board of the controller? Thanks for any help everyone!

Topic by Mercenary Wubby   |  last reply


Making a Cryptuino! Cryptex/Arduino Audio Device project

     So recently many of the students around my college campus that get stuck here on the weekends, myself included, find themselves with nothing to do. Personally i want to do something to remedy this. Hence why im thinking of creating a series of challenges and puzzles all around campus on some weekends. How it would work, device and plan, is as follows: -----      Players would pay an entry fee, of which there would be 5 or less in one group. Either way, small number of people to start off with in the beginning. One player would be designated as the "Handler", and would be in possession of the Cryptuino. The Handler would be responsible for entering the first password so instructions on how to beat the challenge would be relayed to the player/s.      If the challenge was beaten, then the group would be given a reward and a new password, which when played would direct the group to a different area for the next challenge. Once they get to the challenge, the process would repeat itself, and it would repeat for a number of times depending on how many challenges there were.      To make things more like a game, the player/s would be able to score points by completing certain requirements in the challenges. Some requirements would be like:  different time ranges for mazes or races, correct/incorrect answers on puzzles, or other things that i have yet to figure out. -----      Im still trying to figure out how to build the device, especially with the hardware part. I also dont have much cash to spare for good shields and parts but i do have a plentiful amount of electronic junk i could use. From what i was told on the Arduino forums, i would need a .wav shield and a keypad to go with my Arduino Uno. Is there any places on the internet anyone would know of on how to make my own shield and keypad?      I have figured out how to make my own SD card slot for part of the .wav shield, and i have a number of button switches i could use for making a keypad. But to make a working shield/board and keypad, i am mostly clueless on the processes. Can anyone give me some advice or pointers in the right direction?

Topic by EngineerJakit   |  last reply