Search for mono in Topics

How do I make a mono wheel?

One of theese things...Pedal or motor powered

Question by Clayton H.    |  last reply

Convert stereo to mono? - creating 3 channels, mono, left, right

I have a little problem.... i want to convert Left, Right channels into 3 channels, Left, Right, and Mono is it possible to build this with a couple diodes? Thanks in advance!

Topic by Sandisk1duo    |  last reply

How to use stereo audio pin as mono? Answered

Hey Guys, I needed a mono audio pin for my project but all i cold find is stereo so i bought it thinking that it would work. Now that I have it I have no idea how to use it as a mono audio pin so I  was wondering if anyone  could explain how I would go about doing this. Project: Thanks in advance. -Prickly Potato

Question by SA-DIY    |  last reply

Mono Bass in Stereo System

Hello Everyone I'm building a portable amp system running in stereo, but I only have one Bass speaker. Each Speaker (5, left/right tops, left/right mids and the bass) has its own amp. How can I connect the input on the bass speaker to the (stereo) input while keeping the channels separate? Thanks. 

Topic by IronCake  

How to mix stereo & mono inputs for XBox headsets

Does anyone know the best way to merge/mix a stereo input and a mono input so that the stereo remains stereo, but the mono input can be heard across both ear pieces? I've got a project in mind to create a box which will do this for using normal headphones for my Xbox 360 in-game chat. I'm just not sure if I need to isolate the mono input with a diode so that it doesn't turn the stereo input into mono.

Topic by WildBlueRhino  

Is there a way to build mono or stereo speakers into a computer tower without too much hassle?

I would like to have a fully functioning speaker (mono or stereo) like the mono iMac G4 Towers had.  I was thinking I could mount it where a fan is supposed to go, but I don't know where to look or what my best option would be.  The idea is to have as much flexibility as possible, and built in speakers would be a step in that direction.

Question by jbaranski    |  last reply

Questions about computer stereos

Hi! I'm building a portable amplifier from old computer-speakers and I have a couple of questions about them. 1. How do I make the stereo-speakers mono the best way? 2. Is it possible to make low- and high-pass filters to a simple amplifier as the computer ones? I thought I'd connect one bigger speaker (a whopping 5" one!) to amplify the low frequencies and one small to amplify the high frequencies. This would work the best with a 1-channel amp. Thank you in advance, hope you understand what I'm looking for! P.S. Please move the thread if it is in the wrong category, wasn't sure if it suited better under "music" or "tech".

Topic by Henell    |  last reply

OP-Amp Troubles

Hey everyone I was hoping someone here could help me with a problem in having. I've been tinkering with some op-amp circuits with the LM386N-1 namely the one I have pictured. I first assemble them on my prototyping station and they work well using the signal generator but when I connect them to a audio line from my computer nothing comes out the speaker I have tested the cable and speaker and they both work so I am at a loss as to what's not working. I would appreciate any help you guys can give me thanks

Topic by juggalo_assassin183    |  last reply

Mono pole / single pole magnets!?

I made a quite intersting discovery today.The use of mixed orientations for a stronger or more directed field on one side and a much weaker on the other side of a magnet is nothing new. But if you check modern wind turbines or even just any old hard drive you find "chokes". I talked about shielding before but combining shielding a choking provides again another level of manipulation.If you ask anyone who claims to know magentic field or sience in general then you right away hear: There is no such thing as magnet with just a single pole!Like a battery one pole can't exist without the other!Keep going and your conversation parten either get angry or declares you a nut case.Also said before: The laws of nature and physics are not set in stone or complete for that matter!We only use what we know, or to be precise what we told to take as facts.A magnet with just one pole is impossible to manufacture, if you only think like making the magnet like any other magnet.Even cutting it in half will only give you two normal magnets again.Why is that so?How are magnets made is what you need to know.No matter the material they start as a blank and during the final processing an intense electromagnetic field is used to "prime" them.Like you would do on a screwdriver the material then keeps the "charge" and becomes magnetic.And this process requires a certain orientation.Imagine a big hydraulic press to make the magnet with some super strong electromagnets right beside the forms.Explains why you won't find a block magnet with the poles on opposing corners - the form is not designed to be rotated ;)Ferrite magnets can often be machined.If you mark the field direction of a block then you could just cut it into the shape you need.Like a half moon, triangle, pyramid...The orientation does not change, so you need to create the cuts so your required orientation matches the orignal block.Creates a lot of waste, is messy and often the magnets shatter.Still not possible to create a mono pole ;)But it allows for a great deal of field manipulations.For example a thick north and a thin south pole would show very different field strengths at the poles.How to create a mono or single pole magnet then??If you think outside modern science restraints it is suprisingly easy!You see, unlike a battery the magnet does not care if the "current" flows back to its own pole or a pole from a different magnet.In a hard drive the choked magnets have a field strength between them that is not just twice as much as th one from a single magnet.The field between the magnets is very stable too!No matter where you measure it is the same.Place two magnets in the same configuration with the choke and all you get between them is a mess.To understand the reality with magnets I need to explain a bit more though:If it does not matter from where to where the field lines go the it becomes obvious that you can guide them.Horse shoe magnets of the old kind where just two steel bars with a block magnet between them!Take a compass and check from what distance your magnet will start to affect the orientation.Now take two iron bars, rods, block or similar of about twice that length.Place the compass between one end and the magnet between the other end.Even with a little gap your compass will still move!You just extended the length of the field lines and directed them somewhere else as it also works with odd shapes.We know know and confirmed how choking works and as shielding is basically the same thing but for a different purpose you might get an idea where I am heading already.A "potted" magnet, like what you find in a speaker or as a hook magnet utilises two destinct features.a) A ring magnet is used.b) The field lines are directed to a specific area.One has them directed into a gap for a coil like in a wind turbine, the other to the surface to massively increase the field strenght in that area.If you take either apart you will notice the magnet just by itself is considerably weaker.Removing a pole from a magnet...If you paid attention so far and have a few magnets around then you already developed a feeling for the difference.Lets crank it up a notch, shall we?Make this experiment:Take two identical magnets and a soft steel bar or similar of lesser thickness than the magnets.Usually around 2-3mm for smaller N52 Neodymiums will do.If you dare make the steel the same size as the magnets.Now place one magnet on the steel and use the other to observe the difference in feel.There won't be much and both poles should still fell like before only that the field is now slightly longer.Trying to get two magnets to touch at the same pole is really hard, but see what happens if you add the other magnet on the other side of the steel...Despite having the same pole on the steel they won't repel and stick to the steel.Checking the field now with a magnet provides a very different feel!It is like having a magnet with a split pole where the opposing pole now is in the center.Impossible I know but you have it in your hand, so deal with the explanation yourself ;)And if that is so damn easy then how hard can it be to actually remove one pole fully?Design of the impossible magnet...If you want the south pole only then it would be the entire surface of your impossible magnet.That means you either need to make sacrifices or get creative for the next steps.Easiest from my experiments is to sacrifice like all scientists do and allow for some minor gaps.I won't give any dimension or step by step instructions.Think 3D and use your imagination.Our impossible magnet starts from the center.All magnets used should provide the same field strenght!To be precise it means no matter their grade, the the "force" of the magnets should be as close to identical as possible even if the size is different.You can use stacks or different types/grades...The center is a square block of soft steel, or iron as pure as possible - it needs to have a low "resistance" if you compare them to batteries and to avoid confusing terms.On this "dice" you place one magnet on each face, preferably of identical size to the block.So, for a 10x10mm block you use 10x10mm magnets -simple isn't it.All magnets are place with the same pole onto the block!In out example to get the south pole outside you would use the north pole.Now use six bigger magnet blocks for another layer.This time they are placed in attraction mode, meaning you let them stick together naturally.The resulting magnet will be far from perfect but you will have a hard time finding a strong attraction to the soth pole of a magnet if you move it around your cube.If you check the geometry you will now see how 45° degree angles and matching sizes for the blocks would be beneficial.Using ferrite magnets you can machine them to the desired size and use a thin aluminium or breass frame to hold the outside properly together, like edging on a fancy tranport box or chest.Check the magnet now and try to find anything else but a destict south pole on all faces and corners.No more nother pole....Does that mean it really is a mono or single pole magnet?Since modern science does not even consider a construction like this to be worth testing you already know the anser.For those working on a different level with magnets it will be a true single pole magnet.For the rest it will just be another fake.As by science a permanent magnet is defined to have two poles and to have field lines going from one pole to the other.All modern machines using them operate on this principle and "fact".But if I would give you a block of steel that has a core of lets say brass and a suffien wall thickness...Then this block would appear to be a steel block and nothing else.Modern science fails to see a magnet any other than a battery!If the "current" does not need to go back to same pole and there is no need for the field lines to go back to the outside pole then it is a single ple magnet like the faked box is a steel box.The physical outcome or in our case magnetic field is what defines it!The contra...All good has some bad, magnets are no different.Purely scientific viewed it would be impossible to create a gap free magnet like I described.And because never all field lines will take the shortcut there will still be a small amount of "north pole" to be found on the outside.But if that is in the range of about 1% of the field strength of the magnet then I say it can be neglected for almost all real life uses of such a magnet.Like the Halbach Array it is just a neat way of manipulating and if you like bending the known interpretation of our scientific understanding.Possible uses for these magnets exclude convention designs and for this reason alone anything you create with them will be the target of scepticism to say it nice.Ok then, what real life uses could there be for something we never needed?The question is the answer, as the impossible magnet is the solution.Ever watched these shopping shows in the night program?"It solves problems you didn't even know you might get..."Means that if you ever get the ide that your project requires a single pole magnet then you know how to make one ;)All I can up with would go against common scientific understanding and teachings, so I will spare you with my use cases ;)And what is missing here to actually make it work?Quite a lot as you might have noticed in your experiments if you use really good test equippment.Not so much however if you consider what I said about shielding and choking ;)Provide a path of far less resistance and shield the rest that still bothers you.I am not providing a ready to go model here that you can buy, someone else will do that if they see a financial gain it.My gain is provide a new understanding of things we forgot by giving your brain things to work with and develop.You might still say in the end that my way (or your results) are not good enough in some way.But then please also consider how many other people or documents you might be able to find that would have provided you with this information.Free energy is only a myth for as along as we allow ourselfs to only trust what modern science allows us to have.Allow the old knowledge in and every now and then simple ignore what you know and things become possible sooner than you might think.Wind and water were used as a source of free energy since the dawn of mankind.Our first motorised boats used the same "wheels" we already trusted to be driven by water to power a mill, saw or similar.And after we learned about motors we also found a way to make wind - by reversing our trusted wind mills into a fan.Instead of using the free energy to generate power for us we evolved to use create wind and propulsion by providing power to drive the same thin in reverse.Using the sun for power other by using a mirror was seen as witchcraft throughout history, then we got solar cells...Same for heat in the form of peltier elements and other things...Why then should magnets be any different??Just "Because it is so!" did not work for wind, water and solar, not even for heat....All it takes is a little notch in the right direction to change the way we think about magnets.We have no problem using electromagnets to make a motor spin.We have no problem using magnetic field of any kind to drive motors or generate electricity.We even fail to have a problem by manipulation electromagnetic fields for that purpose.But we struggle like an ant in sand hole to reach the surface again to see what is outside our trap before something grabs us from behind when it comes to permanent magnets.Even worse if you dare to claim your magnetic machine delivers a higher output energy than what you use to make it run.And wasn't it exactly the same ignorance and manifested "knowledge" that got revised so many times throughout history already?Again: Why should magnets or their understanding of interaction be any different?If you follow the above with just matching magnets and the core cube then the result will be at least very surprising to you.Allow this surprise to be an inspiration to improve instead of seeing as a proof of failure ;)And if you made it then please post about it here.Let me know what disappointed you with the outcome.Let me know what really got you wondering.Let me know if you found a suffiently strong north pole to rival the impossible southpole! ;)Start sharing, make other people wonder and make them share it to, let us go viral!The first to post a conclusive Youtube video with results is certain to get a lot, lot, lot attention....

Topic by Downunder35m  

Need help with wiring mono jack

Okay, here's the plan. I'm taking a children's keyboard from goodwill and adding... *a mono jack (second pic) *a switch for choosing between mono output and the internal speakers (last pic) *a strap I just have a few questions reagarding this project. First off, could the mono jack possibly be over-powered and mess up an amp? Finally, should I use stranded or solid hook-up wire for carrying the signal? Both are copper. I appreciate any help you can give on this subject.

Topic by Fenwick  

Mono channel Subwoofer amplifier with TDA2052

I have a tda 2052 and a 6" 60watt subwoofer lying around, so wanna make a single channel subwoofer amplifier. Anyone can help me with a good build? And also please provide data sheet if possible.Thanks in advance

Question by Sayan_trex    |  last reply

Replacing a picture in a mono viewmaster toy

Disney had this line of single pictures viewmasters back in the day   My girlfriend is a huge fan of Lion King and I  wanted to replace the picture inside with one of us.  I was curious if anyone else had attempted a similar project and could offer advice.  Thanks in advance

Question by mrubesch    |  last reply

Making a lightstand from a mono pod?

Hello all,  This is my first time posting on instructables.  I've found and used so many great photogrpahy ideas on here I figured someone might be able to help me out with a little problem I'm trying to solve.   I got 5 of these:;=10440897&PID;=1225267&nm;_mc=AFC-C8Junction&cm;_mmc=AFC-C8Junction-_-cables-_-na-_-na&Item;=N82E16830997069 I got all 5 of them for $5 total because of a $30 giftcard I had.  They were on sale for $7 each.   I'm trying to figure a way I can use these as lightstands for my speedlights.  I've had the thought of building an X type base out of wood with a bolt coming up through the base of the monopod but I was thinking of trying to find somethign that would be a bit more portable an X I could fold down somehow but that would still support the monopod.   I'd be grateful for any ideas?

Topic by bentlax33    |  last reply

Converting stereo sound to mono from an mp3 player or other similar devices? Answered

I am makin a small project where i need to input mono sound. almost all mp3 players output stereo channels.  in my circuit i have a TS connector where mono sound need to be input.  if i connect a TS connector in a TRS socket., will the output be automatically be mono or i will only get one channel out of the stereo output from the mp3 device???? thxs in advance

Question by ARJOON    |  last reply

Splitting an audio signal on a PCB - Doides required?

I have a 3.5mm audio jack on a PCB.  I want to split the signal to go to two different places on a PCB.  Do I need a diode on each "branch" or literally just split them in a T with no components in between?

Question by Joe426    |  last reply

'Can I connect 2 TPA3118 60w Mono Module to create a Stereo Amplifier?'

This is the only amplifier I had lying around and since it was a mono amplifier, it only accepts 2 inputs. By using two boards at the same time feeding the same signal wherein the LEFT channel and GND goes to the 1st board and the RIGHT channel and same GND to the second board will it work smoothly as a stereo amplifier creating a 120w Amplifier? ~(Also, I'm using only 1 power supply to power the two boards.)

Topic by Chloe_Lemaire    |  last reply

Splitting Mono to "Stereo" 2 voice coil sub Please read Details?

Hi everyone! 1- 5.1ch amp 2- 2/4ch amp 3- Wharfedalle home cinema sub with 2 voice coils I want to take the sub output from the 5.1 amp to L/R RCA input on the other amp and then hook up 1 voice coil to one ch and the other voice coil to the other channel.. to splitt the mono signal to "stereo" how should I do? can I simply solder the input wires in paralel?

Question by Exiumind    |  last reply

1/4 inch mono audio jack question. REAL simple? Answered

I am building  I am using a 1/4 inch mono audio jack like this one; I know the output on the lft is negative while the one on the right is positive. my question is on the circuit the jack on the far right only has one wire leading to it. it it positive or negative.

Question by miiwii3    |  last reply

Bag labelled Kandis? Answered

So today i got a bag ,  one of the things inside was a small bag labelled "Kandis", with the numbers 0000. Inside are large clear/white crystals about 1 cm2. The crystal structure is monoclinic. As in square with angled edges. If anyone can tell me what these are, i would be very grateful.

Question by LiquidLightning    |  last reply

Simplest way to combine a mono and a stereo source to play through a set of stereo headphones?

Ok, what I am specifically wanting to doing is make the Xbox voice chat (mono) and the game audio (stereo) come out through the same set of headphones. I quickly found out that I couldn't just wire them directly without turning the game audio to mono (not good for online multiplayer). I found a discussion about using an "opamp" and taking the mono signal and feeding it into the right channel then take the opamp output and feeding that back into the left channel to get a "stereo" output. Unfortunetly, I got as many details from that as I just gave here. Can anyone explain how and what parts it would take to do this? I also got the impression it might be passive, and no batteries would be a plus. Preferably, I would like to be able to get the stuff at Radioshack, and ideally, I would want to try and stuff the parts inside the over-the-ear cup style headphones directly.

Question by vphreeze    |  last reply

What speakers can go with a 7W mono amplifier? Answered

I have a bunch of speakers lying around, and I recently bought an amplifier kit from Velleman. Specs: Music output: 7W/4ohm RMS output: 3.5W/4ohm or 2W/8ohm Total harmonic distortion: 0.05% (1W/1KHz) Frequency response: 20Hz-20KHz (-3dB) Input sensitivity: 40mV/150Kohm Signal/noise ratio: 86dB (A weighted) Power supply: 8-18VDC/0.5A I have two 8ohm 2W speakers, and two speakers that I can't seem to find the specs for, but it's the same speakers in the picture. I was just wondering if I'd be able to wire up the two 8ohm speakers together and connect it to the amp, but from the specs of the amp, I'm guessing I can't do that? And out of curiosity, what happens when you wire up speakers that don't suit the amp? Also, would 4AA batteries be sufficient enough to power this? And any extra advice/input would be greatly appreciated!

Question by Justin Lam    |  last reply

What are the specs for 'standard' 3.5mm mono pluged infrared (IR) emitters?

An example of what I'm talking about can be found on Amazon.  I am looking for which conductor is anode and which cathode as well as the forward voltage and current requirements.  My inability to see IR is really hurting my normal LED testing techniques.

Question by EmperorMing    |  last reply

How to properly bridge 2 mono jacks using a 1uf capacitor and connect to rheostat?

Hello everyone, I am struggling on the proper way connect a few parts in my power source. At the moment I am about to wire my rheostat to a mono jack. From there I need to wire a 1uf capacitor to a 2nd mono jack. I do not understand where to connect each wire. I know how to wire the rheostat to the first jack but from there I do not know how to properly bridge the 2 jacks with the capacitor. I know I need to connect both jacks but how do I wire this? Do I connect the capacitor between both "ground" leads on the jacks? Does this also constitute  connecting both jacks in general? Also, the 2nd jack will be connected to the rest of the negative circuit in the source. I really hope I explained this well enough. I am new to electronics and I am still not that familiar with terminology so please bare with me. I would appreciate any help offered. Thank you in advance!

Question by alp0204    |  last reply

What type of mixer should i use (diffirent type input)? Answered

Hello . I want to make a op-amp mixer with 2 inputs. Input 1 : mono signal from mp3 player. Input 2 : mono signal from overdrive pedal. (please see the image bellow ) I have op-amp : tl072 and ne5532 and i need the pedal use single power supply. and the schematic of the pedal i use is show bellow. thanks for advance ! p/s: sorry for my bad english.

Question by login721    |  last reply

camera memory

If I were to take one of those tiny camcorders that just has a mono sound out and a video out (yellow plug on tv's), is there a schematic that I can use to record them to something like an sd card?

Topic by guyfrom7up    |  last reply

how do I bridge a stereo car amplifier?

Http:// this source say that my amp is bridgeable and that it can run stereo and mono simultaniously. It is a 2 channel amp, however I only have one speaker.. I need both left and right channels running into the speaker. How can this be done? What would be the impeadance if the amp is running at 4ohms and the bridged subwoofer speaker is 4 ohms? what would be the overall wattage? how do i do this without causing damage toi my sub,amp, or radio? does this put excess strain and/or heat on the amp? if so how do I fix this? is there any wiring gauge problems that i should be concerned about? (18 gauge for input power, 18 gauge for speaker output, plan to lower the gauge of the speaker to somewhere around 12 or 14)

Question by fastcar123    |  last reply

pdf file does not download

I  cannot download the pdf file from: I have tried a different browser and get the same problem. Thanks

Topic by marcorexo    |  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

Problem with a 30-0-30VDC @10amps transformer/SMPS and 400WATT RMS mono amp(not PMPO) Answered

First of all thank you so very much, i have successfully build my rectifier but now i am having a problem with it. Can a 30-0-30VDC @10amps transformer/SMPS, power a 400watt-RMS car sub @4ohms with a 400watt-rms mono amp. When i tested the 400watt subs, the gain is too low or am i doing something wrong here. This is my 400watt-rms amp... Thanks much, appreciated.

Question by Lima79    |  last reply

What's the best way to "add" together both channels of stereo sound into mono?

I'm making a VU meter and I don't want to replicate my circuit for both the left and right channels of audio.  I'd like to just "add" together both channels so I can view them on the meter together.

Question by Joe426    |  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

Do I need to invert phase a second time? Answered

I'm building a guitar pedal and I am inverting phase with the initial buffer (TL072). I am then splitting the signal into two parts, dry (no effect) and wet (effect). Each of these will be output as separate channels (left and right) and not mixed back to mono. I plan to send each channel through its own 386 amplifier chip to boost it to a level suitable for headphones. So, what I am wondering, is, should I use the 386 to invert the phase a second time back to normal? Or should I use an op amp at unity gain to do that before I send it to the 386? Or does it not matter if I am not mixing the two signals back to mono?

Question by randofo    |  last reply

2" LCD pocket-TV, any ideas for projects? Answered

Rummaging through the attic I recently found my old pocket LCD-TV from the 90's. Since television in Sweden has become digital and It being of the analog persuasion I have no current use for it. What project can I use it for?Specs are :2" colour LCD-screen, very low resolution. Enough to watch TV or play PONG but not enough for a C64.Composite Video input & Analog audio input (mono), via 3,5mm audiojack.3,5mm audio output (mono)Runs on 6v (4 AA batteries)I nicked this image from Frank's handheld-TV pages . Thank you and hope you don't mind, Frank.

Question by omnibot    |  last reply

Can i bridge two bridged amplifiers?

Well, the question itself tells a lot (mostly how bad it's asked). I have a quad amplifier that i'm using as a stereo bridge. So is there a possibility to bridge those two (or parallel em?)   This amplifier is not some factory made amp, It's a simple amp i made with TDA7375. The output is somewhere between 2x30 and 2x40W , but i'm only using one channel and it seems like a waste (I'm using it as a small woofer driver, didn't have another amp so this one had to do) So, The question is Is there a way i can make this Mono so i can get some more power out of it (or just use both channels so i don't only use one). The amp is TDA7375 and the speaker is Novex sps250i (yeah, it's crappy but sounds decent) Also it says nowhere that this one can be bridged to mono. Also won't it work if i parallel two channels and then bridge them to mono? (as in parallel four into two then bridge those) From what someone told me if i want to parallel it i'll need some 0.1ohm 5W resistors (those are really cheap and easy to find here) Thanks in advance.

Question by T0C    |  last reply

Could this be used as a guitar amp or converted into one?

Http://;=STRK:MEWAX:IT&item;=190311640003Could I convert that into a guitar amp? Im thinking that because its mono and not stereo it should work fine? Any thoughts or suggestions?

Topic by jackillac92    |  last reply

Arduino Uno Synth project - Audio output questions

Hi! I am developing a synth/sampler project based on the Arduino Uno r3. This is my first electronics project ever and because of that reason I have some questions which I can't find a definite answer for on internet. The synth has two function. It has a tone generator using the ToneAC library. With code I have mimicked LFO and VCO functions, using potmeters I can adjust the frequency and LFO speed realtime. The other function is that I can trigger samples stored on a SD card using the TMRpcm library. The device will be used in nightclubs on high end soundsystems and PA. I am afraid I will damage the equipment with my device because I do not send a pure audio (AC?) signal. Currently the flow is like this: PWM output (pin 9, 10) -> voltage divider to 2.5v -> RC Low Pass Filter 15Khz -> LM386 amp with volume control -> mono jack output -> mixing desk -> amplifier -> speakers (the TMRpcm and ToneAC library share the same pin (9), I have fixed this by disabling the TMRpcm when the ToneAC is playing and vice versa. The mono jack is wired as follow. pin 9 goes to plus side of mono jack output, pin 10 to negative side. The TMRpcm pin 9 also needs to go to plus side of mono jack output, and mono jack negative needs to go to ground. Because I disable the ToneAC at that time I consider port 10 grounded because it not generating any sound so there is no signal/voltage running out of it, aka the IO pin is set to LOW) I am hoping that using the voltage divider I am within range of the Audio Line levels of a default mixers Line-IN (like Pioneer, Behringer, etc). The RC Low Pass Filter is used to filter of inaudible frequencies and clean up the sound a bit, the LM386 audio amp is used to amplify the signal and (hopefully) make it a real audio signal. The lowest frequency you can play with the synth is 100hz and the highest frequency is 3100hz. Because I lack a lot of knowledge in this field and because I do not own a oscilloscoop I can't say for sure if my output signal is harmful for the equipment and was hoping to get some guidance on my project on this forum.

Topic by erik404  

use an op amp to have two outputs?

Hello, I need to amplify a single mono audio input with two op amp or a single dual op amp and have two discrete outputs that can filtered at different frequencies and then those outputs have to be read with an arduino with two different analog inputs, is this possible? Thank you.

Question by dkoshkin    |  last reply


Looking for some help with an audio issue in a museum kiosk. I have a small 10 watt stereo amplifier running a single 8 ohm speaker. My audio source file is in mono and need to keep the single speaker. Using shielded stereo audio cables. There is a faint amount of static coming from the speaker. Is there a way to reduce this noise/static?

Topic by jimboothdesigns    |  last reply

Favorite Post-Rock Bands?

Mine are: Explosions in the Sky, God is an Astronaut, Mogwai, Sigur Ros, Mono, Valley of the Giants, Caspian. Currently exploring an indie post-rock group from Greece, No Clear Mind. They have pretty good stuff on YouTube. Share post-rock bands that you know, I might like them too. :)

Topic by Analogue-Chick    |  last reply

Adding an 1/8 stereo output to a single speaker. How?

I have a mono speaker record player I bought at Sears in 2005. I'm looking to add a 1/8 inch jack so I can hook it up to a surround sound system. How could I do this? In the photos the red and green wires are connected to the speaker.

Question by friendlyghost    |  last reply

56_0_56VDC = 112VDC Answered

Hi, Just say a 500watt RMS Mosfet mono amplifier the maximum input VDC is rated at 56_0_56VDC, when we test with a multimeter the +56v and -56v voltage is 112VDC, so i am wondering does the amplifier uses the entire 112VDC or it splits the voltage into two 56_0_56VDC because if the amplifier uses the entire 112VDC then i think the 112VDC is a lot of voltage and could burn the amplifier. Thank you.

Question by Lima79    |  last reply

Photography Contest

I just submitted an instructable for the Photography Contest and it was not accepted and I'm not sure why? It explained how I used Photography in my art? The Instructable is called LEAF PRINTS, Perhaps it is because I explained the process as beginning with mono PRINTS instead of Photo PRINTS? I thought I explained how I discovered creating the photographs? Help me understand! Best, Susan Cirigliano

Topic by Susan Cirigliano    |  last reply

Killswitch Help

Alright, so i built a killswitch for my guitar like SomeRockenGuys minus the rocker switch. and i get this buzzing noise, kind of like feedback and i was wondering if anyone had any ideas on how to tame this wild buzzing. I've got mono jacks in there now, would stereo help? what about grounding it, what would i ground it to?All suggestions are appreciated?

Topic by 0utCold    |  last reply

can anyone help me in makin' a remote for my external soundcard ?

 emm hi ! i have an external sound card ... with one stereo headphone output on front and 4 mono sound monitor outputs on rear,,,it's funny but my soundcard is a little far from me and my hand barely reaches to the vol knob ... thanks ! :D.

Question by whooms    |  last reply

Do speakers have a Positive + and a Negative - like LEDs? Answered

I'm planning on hooking up a small speaker out of a cheap toy to a 3.5 mm Mono jack that will go into my mp3 player but I don't know if it matters which wires go where. Do speakers have a Positive + and Negative - like LEDs? If they do, how would I find it out? Thanks

Question    |  last reply

Wireless headphones to amplifier Answered

I took apart some wireless headphones because I wanted to hook up the receiver to an amplifier using a 1/4" male jack but in confusion I tore off the speaker leads and grounds I managed to find the leads (marked SP1 and SP2 I only want one side though since its a mono plug) if the Part marked SP1 is the lead how do I find the ground?

Question by AusencioFlores    |  last reply

is there a mod so i can use the cymbals from rb2 to work on my ghwt set?

My yellow cymbal wont work on ghwt i can plug the orange up on the yellow side and it works but the yellow will not work on either,was wondering if there was a way to mod my ghwt to use the cymbal kit from the rb2 kit,ghwt has a mono plug for its cymbals but rb2 has a double jack.thx guys


The Self-Righting Object

The Gomboc is a "mono-monostatic" object -- a three-dimensional object that purely by dint of its geometry has only one possible way to balance upright.The challenge intrigued two scientists, Gabor Domokos and Peter Varkonyi, both of the Budapest University of Technology and Economics. They spent a few years doing the math, and it seemed as if a mono-monostatic object could, in fact, exist. They began looking to see if they could find a naturally occurring example; at one point, Domokos was so obsessed that he spent hours testing 2,000 pebbles on a beach to see if they could right themselves. (None could.)After several more years of scratching their heads, they finally hit upon a shape that looked promising. They designed it on a computer, and when it came back from the manufacturer, they nervously tipped it over, wondering if all their work would be for naught. Nope: the Gomboc performed perfectly. "It's a very nice mathematical problem because you can hold the proof in your hands, and it's quite beautiful," Varkonyi says.It's apparently similar to the shape of tortoise and beetle shells, explaining why these creatures can actually flip themselves back over.

Topic by canida    |  last reply