Search for use as mic in Topics



Microphone sensitivity range?

Can a normal microphone as present in most headsets detect noise levels below and/or  above human audible frequencies. And if so  is it possible to see the audio waveform for such noises using such a mic?

Question by muhammajunaid    |  last reply


Does the ipod touch have a mic? Answered

If not, can you use the mic on the headphones that have a mic on them?

Question by JellyWoo    |  last reply


codevison to programe atmega16 mic

I m using codevison to programe atmega16 mic for a lcd display.....dont knw d prog....could u help me with a test prog?

Question by lcdproject    |  last reply


Wireless headphone with Microphone

Can anybody tell me how to make a wireless headphone and microphone. Both microphone and headphones should be wireless. I found that one can buy a wireless headphone or a wireless microphone, but not a combination of both. Why I need it. I make long phone calls, during which I need to walk around. If I use a cordless phone, I have to keep holding the receiver with one hand all the time. If I use a speakerphone, everybody around listens to the conversation. Therefore I need one wireless headphone with mic.

Topic by anilsaxena    |  last reply


Is it possible to modify a Bluetooth Receiver to use inline microphone of stereo earbuds instead of unit built in mic?

For years I have been using Bluetooth Receivers such as this Sony : https://www.amazon.com/gp/aw/d/B0154G9CYY?psc=1&ref=yo_pop_mb_pd_title# The problem is they all have built in mic which I don't like, I prefer to use the online mic on my wired earbuds headset. So question is if I were to disassemble the bt receiver device and disconnect the built-in mic would it then let me use the inline mic on my on my earbud headset?

Question by laingman  


hi...was just wondering if there was a way i could use a telephone headset or an x360 headset to use skype?

 id appreciate the help...just a link even. thanks a ton in advance.?

Question by just lady    |  last reply


3.5 mm 4 pole splitter question (for use with ipod touch)

Hi, I'm attempting to put together something that is conceptually simple -- making a splitter for the 3.5 mm 4 pole audio jack so that one end supports a mic and the other a pair of headphones. I'm doing this because I want to hook up a better quality mic than found in the store-bought iphone headsets. However, after putting it all together, I just can't get it to work with my ipod. I've followed these pinouts (where 1 is the tip and 4 is the base): 4-pole jack 1. Left Audio 2. Right Audio 3. Ground 4. Microphone 3-pole jack 1. Left Audio 2. Right Audio 3. Ground Ive verified that all the connections are good using a multimeter. But when it comes down to actually recording with my ipod, I can't get the line in to work. Has anyone does anything like this before? Any ideas what might be going wrong? Is is it possible that measurements on the 4 pole jack isn't standardized and that the one I have doesn't actually fit the ipod correctly? Perhaps I'm completely wrong about how to connect the wires. So just in case, this is what I did: Line-in: Pinout (P/O) 1 and P/O 2 ---> P/O 4 (on 4-pole) P/O 3 --> P/O 3 on 4-pole (on 4-pole) Line-out: P/O 1 --> P/O 1 (on 4-pole) P/O 2 --> P/O 2 (on 4-pole) P/O 3 --> P/O 3 (on 4-pole) So yep, that's it. Any help is much appreciated : )

Topic by hlfwy.thr    |  last reply


how do i start a project using a microphone to cause a servo to "sweep" depending on the sound level?

I really want to make a servo rotate like when using the sweep code but with a microphone instead of a potentiometer. the servo would move depending on the decibel level and return to it's default position once the noise stops. i can code myself but i don't know where to start and i can't understand the microphone related code parts, i could really use some help with getting started, i would be greatful on many levels. EDIT: i scraped this together but it doesn't work exactly how i want it to #include int micPin = 1;    // select the input pin for the mic input       // select the pin for the LED int micValue = 1;  // variable to store the value coming from the mic Servo servo09; void setup()   {                        servo09.attach(9);    } void loop()                     {     micValue = analogRead(micPin); // use what ever threshold between 0-1023 you wish to switch  the led         if (micValue > 2)     {                         servo09.write(10);         delay(1);     }     else     {                         servo09.write(100);         delay(1);     } }

Question by katman101  


Can i connect two xbox 360 headsets together so two people can hear and use the mic during online game play?

What i want to do is basically "piggyback" one set off of another i have the basic wired headset that comes free with 360 purchase. This is my first time on the site so sorry if im not being clear enough! any other questions just ask

Question by schmit22    |  last reply


How to join a 3.5mm Jack to a Microphone ?

I want to make it to use it as a Mic.

Question by Milin 18    |  last reply


Public Address System build Project

Salam and Greetings everyone, I am a university student and I need to build a good quality PUBLIC ADDRESS SYSTEM using simple 3.5mm jacks for mic input and spkr output and giving output on 2 to 5 speakers and controlling the output to speakers through switches enabling individual use and all at once  I would appreciate all help in form of advice, suggestions, links to websites and blogs, or text files videos anything... Thank you everyone in advance....

Question by General Talha    |  last reply


Headset Confusion?

I bought a turtle beach cable to use my x31 on my pc. I managed to finaly get the mic to work but the sound  quality is less then that of the wirlress one I bought the cord to replace. Im not sure if its the 3 different levels it go's through or faulty cord.  Any suggestions? I allso have 3 audio jacks. Anyone have a clue what the third could be for? 'Info http://www.turtlebeach.com/products/xbox-gaming-headsets/ear-force-x31.aspx http://store.turtlebeach.com/ps3pcchatadaptercable-cab.aspx http://www.newegg.com/Product/Product.aspx?Item=N82E16834220715 Gracias

Question by zigzagchris    |  last reply


Converting speaker input to mic jack

Hello,so i did this project of a spy mic using the lm386 amplifier, i took the schematic from afrotechmods, and it works. what i wanted to do was modify this circuit in such a way that instead of letting us listen to the voices of that time, i wanted to make it work on a phone, so i could record the audio in my phone, the original circuit diagram is attached. i also added my modified diagram. i just want to know if it will work, and i wont end up damaging my phone. what should i do to make this work right? the ''speakers'' in the original diagram are just earphones, no high power speakers. any help will be appreciated, thanks

Question by walee    |  last reply


Anyone know how to wire two 360 mics together to use as headphones? Answered

I want to create some headphones for my phone and the 360 headset works but I have 3 headsets so I was wanting to wire two together to have a left and right and just taking off the mic, anyone think they know how to do this?

Question by Rath552    |  last reply


Arduino LM386 Pre-Amp for Mic ?

I am trying to (pre) amplify the signal from an electret microphone using an LM386. The output goes into the Arduino analog input 5. I have tried multiple circuits, but none of them succeeded. Either the value settles at some constant or its 0/1023 and even when its in the 500- 550 range, the value doesn't seem to be changing with varying sound levels. I tried these circuits: http://wiring.org.co/learning/basics/microphone.html https://randomskk.net/projects/lightstrip/schematic.pdf http://www.josepino.com/circuits/mini_amplifier_lm386 http://www.diyaudio.com/forums/chip-amps/114698-preamp-using-lm386.html and a couple of more ones. I only have an LM386 on hand and cannot change it, as I need this to work out ASAP(in 2 days) for a science fair project. Hope you guys can help me on this. Kabir

Question by mhkabir    |  last reply


Blue snowball mic and windows 7?

Alright, so today I received my new new Blue Snowball only to find it is incompatible with windows 7, or at least that's what I thought. After searching through the web for a fair few hours I found that many people had got their mic working with windows 7 yet there was no driver or firmware update available to download. I managed to find a firmware update although this stopped part way through demanding administrator rights which I gave it but it still wouldn't work :L I'm using the new macbook pro with retina display if that helps with motherboard compatibility. If anybody has a blue snowball I would really appreciate a download link to the driver you are using Thanks in advance Will

Question by The Rusted Workman    |  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  


Altoids Tin 1/8" Stereo Mixer using a 3.5mm 4 pole conductor (mic + audio)?

Hey have been thinking on how to modify https://www.instructables.com/id/Altoids-Tin-18-Stereo-Mixer/ to accept a 3.5mm 4 pole conductor as the output while splitting the mic to the inputs. This is going to be something like the Iphone ear buds with built in mic. I just got a pair of amplified 4 pole headphones with mic that I want to use for everything.  Here is my wish list:   3 - 4 pole Audio in (iphone, macbook, ...) 1 - 3 pole Audio in from computer 1 - Mic in from computer 1 - RJ10 (so I can use my headset with my cisco phone) The audio mixing is basically the same as Rich's write up. But im not sure if I can just split the mic to everything. If I am sacrificing mic volume by splitting to every input I could limit it to the CPU mic and the RJ10.. the ones i really want. Please let me know any ideas or advice you have. Here is my purposed schematic:

Question by V4zra    |  last reply


What is the best mic/setup for Youtube voice overs at $50-$80 US? Answered

Hello all, Does anyone out there do voice over work or have videos you apply voice overs to? I have recently started a show on Youtube and I don't like the audio quality I am getting. I am currently using my closet as a recording booth and a Rode Video Pro Mic direct into my laptop's mic input. It's okay but i want better. I have a budget of $50-$80 to spend. I have been looking at the Audio Technica AT2100 USB/XLR mic, as it has some awesome reviews but i want to hear from the Instructables community as well.

Question by Sparkytastic    |  last reply


Use Output as Input

Hi ! I have this program, Finale 2005b. I've searched everywhere, and I cannot find any way to export the music I produce in there as a real audio file (NOT a midi). So, to achieve this, I have decided to record the output as the input... using Audacity , actually. To do so, I used a simple mono cable to go from my headphone to mic plugs, and set the volume to the minimum... to avoid too much amplitude going in. Now, for the use I want it, this method is way too dodgy (plenty of interference, specially each time I move the cable 1 mm...) I'm pretty sure there is some program or solution to directly map the stream around... I don't have much funds, so free would be good, and btw I work on Win32. Thanks

Topic by fxsapa    |  last reply


How to make a preamp out of transistors? Answered

I am wondering how to make a simple and cheap preamp for a microphone for recording audio on the computer. I would prefer to use no chips. thanks, josh1324

Question by josh1324    |  last reply


Creating heart beat from mic input?

Hai guys.. I'm doing a project to get the heart beat through a mic... So I connected the top end of a stethoscope to a tube and the other on of the tube to mic (seal tight). The mic is an Arduino mic module. Using anlogread function I'm getting an input with lots of numbers and when plugged into to direct audio to my Mac I hear the heart beat. What I want is to see the bpm from the reading that I'm getting from the Arduino not just random numbers. Is there any way from doing this? Thank You in advance... 

Question by RamalN    |  last reply


Walkie talkie mic and headphone 3.5 mm sockets

Iam wondering if I could get two walkie talkies (2 way radios but I prefer calling it walkie talkie) and add two 3.5mm jacks one for ear phones and one for a mic.  Using a splitter 3.5mm for the sockets, a 3.5mm mic and a 1m extension  for the mic so I can put the walkie talkie in a pocket. Can someone tell me if this will work please and any suggestions for improvements to my plan 

Topic by Ojsmudge    |  last reply


i have 16 mic's from recycling computers(i-mac all-in-ones)what can i do with them? Answered

Im wondering how to hook them all up together & use it to record & tell witch direction the sound came from.or just something goofy looking.

Question by bigmark    |  last reply


How to make my dynamic mic pre-amplifier circuit work? Answered

Hello everyone, recently I'm making a sound box that have a sub-woofer sound system that works pretty fine, but for my usage I need to add a dynamic mic input which needs a pre-amp. before sending the mic signal to the sub. aux. I found this circuit and tried to apply it, I didn't get anything at all, but the surprising thing that when I connected an electret mic, it worked like a charm ! So, what is the problem I'm missing ! if anyone have any Ideas or better circuits for my purpose please feel free to give any ideas, thanks :) Note : even the electret mic didn't work before I canceled the capacitor after the mic input, I'm using uA-741NC @ 12V.

Question by Hawk-Eagle    |  last reply


Salvaging an Old Phone Parts

I have an Old Sony Xperia Z3 and used it for couple of weeks. Unfortunately I forgot to cover its port, got wet inside and broke. I wonder if I can still use its parts like the Camera, Speakers, Mic to a new project? Anyone expert in this kind of field?

Question by richardaguilar0305    |  last reply


Adding Mic Input to a Flip Mino Camera?

I was looking to add a microphone input to my lilliputian Flip MinoHD. My current thinking is that I could just take the leads from the current, built-in, mic and run them to a two-position switch. From there I could then have a 1/8" input on one side of the switch and the original mic on the other. Then it would all be a matter of dremeling out a small spot for the input and the switch on the side of the body so that I could select which input to use.First of all, I'd like to know if that would even work. I've done electronics work before, but have never worked with mics, so for all I know I might just walking down the pathway to a voided warranty and a bricked Flip.Secondly, I was wondering whether there might be a method of bypassing the need for a switch, so that if there was no mic present the camera would use the built-in mic, and if there was, it would use the input.Any help would be greatly appreciated. I was a big follower of the original CVS camcorder hacking movement, and I'd love to see the Flip get the same sort of treatment.Thanks.-NickPS: Does anyone have any pictures of the internals of the Flip MinoHD? I've been looking around but can't seem to find anyone who's dissected theirs.

Topic by foxymcfox    |  last reply


use a landline telephone, speakers, a mic, and a computer to go online with dial-up

Would it be possible to use a landline telephone, a computer with speakers and a microphone, and a software program to connect to the internet with dial-up? there are multiple free dial-up numbers available, so if I called with the phone, and used the computer to emulate an analog modem and listen to the response with the microphone, would I be able to get online? if so, does anything like this already exist?

Topic by tyeverett4949    |  last reply


a very usable project, Cordless Mic for performing.

Hey guys, I perform shows for groups of people, and I had thought of trying to convert my Bluetooth Headset into a Microphone to perform. I just was trying to figure out the best way to make a cordless Mic. I had also tried to use a Cordless telephone hookup. Any Ideas. This may sound simple but it is a little harder than you might think.

Topic by alex26i    |  last reply


In the process of hacking the rather cheaply made RS digital voice recorder I bought recently...

Remember the pic of the voice recorder I had in my April Fools entry ? It looked like the first pic below. It uses a cheap speaker for both speaker and mic. The sound from it is less then desirable, but not because of the chip used, but because costs were cut by using the speaker instead of a decent little Electret mic :-( Well, I have started to work on changing this (as it was unusable as it was): I first soldered in a little mic from an old dictation machine (yeah, it used reel tapes) and this helped. But I wanted it to be more under my control, so I added a switch inline to the mic. Now the sound is great, but it is still barely audible, so the next step is to make a 5X or 10X amp for the playback. I might even get ambitious and put a preamp inline with the mic. This I have been working on in my "spare time" and also hope to get a CAKE (torte) entered into the contest on Monday.....busy busy busy :-)

Topic by Goodhart    |  last reply


Talkback Sytem Help

I Have An ip camera and i want to add a talkback feature using a small pc speaker (s) and Microphones my idea is to run wire (  from mic on desk to speaker by camera) and ( from mic by camera to speaker on desk ) any ideas please help!

Topic by tgray96    |  last reply


Experimental sounds/music

I'm just curious about the people out there who are interested in ambient/experimental music and creating their own. What programs/microphones do you use? What things do you find yourself often recording? Do you manipulate the way your recordings sound to achieve a certain sound? I've just started recording with Bi-Naural Mics. When I want to do field recordings, I use I mini disc recorder. I offer all of my works free to listen to on Jamendo (maybe I should make an instructable on that site)!

Topic by ArisenProdigy  


Direction microphone questions Answered

A few days ago a friend gave me a directional mic he used with his camera.Of course I don't get these things as a working present but to repair them :(Anyway...Taking it apart to expose the inside was the first nightmare as for some reason my friend decided to use a splash proof mic on a totally unprotected cam.If you ever tried to take one of these aquarium tube heaters apart you know what I mean...To my surprise this formerly expensive toy failed due to a bad solder connection, easy to fix.And lucky as well because the actual microphone capsule was glued in place pretty good.A quick test on the computer with the supplied microphone amp showed it worked fine again so I wanted to find out how it actually works.They toy ones use a half sphere or mini dish to reflect the soundwaves onto the mic.My friends however was an aluminium tube of about 20cm lenght.15mm in diameter with the mic being just 5mm and sitting in what seemed to be the end of a little funnel inside the tube - right at the end.So in theory I would now just say the thing gets what comes in from the front, but well that would be far too easy...When I pulled that fluffy sock off the mic I realised two weird things:6 small holes going straight through the mic funnel and outer tube.A glued in relatively soft plastic sleeve with a wave pattern.It seemed this pattern changed on the way down but I could not really see inside properly.Closing the front hole and the mic had no problems getting all sorts of noise from all directions, quite lower in volume compared to a direct hit from the front though.Closing the small side holes with some tape and the mic is still very directional but also really noisy.It seems some acoustic magic is happening in the tube.No real clue though but I guess the sleeve acts like the sound dampening in a test room.Without it all sound entering the tube would reach the mic, while with it really only a very tiny, front facing angle is able to reach the mic.The aluminium certainly transmits some sound onto the mic and the glue appeared to be rock hard as well.So I have to assume that the sound entering through the tiny holes somehow cancels out the noise transmitted by the tube itself.With just 15mm in diameter however I can calculate what I want but am unable to get any true 180° phase shift happening.Looking up how other types of directional microphones work was a bit helpful here but not so much in understanding the holes and liner.My friend said it is well over 30 years old and that he got dirt cheap at a garage sale.No markings anywhere and the small amp only has the connectors for mic, power and output.Did not check the circuit board inside as the housing was glued together.So:Why holes in the side right at the height of the mic?Why does it "hear" all surrounding sound when the front is closed but only directional with the front open?And I mean directional even with some music playing close the mic :(By the way: Battery pack for the mic was the classic four pack at 6 Volt.

Question by Downunder35m    |  last reply


Can anyone help me design a simple stereo electret mic circuit that has a female 3.5mm jack?

I'm new to electronics but in love with it and I have looked around, my cat tends to chew wires, so I wanted to make it easy to replace just the wire in case it happens again. I want to make a mic circuit without the use of IC's but I do have a 555 timer on hand if absolutely necessary. It doesn't have to be stereo because I am new to the hobby and can work with just the single mic at first and learn to upgrade it later. Any help in this would be great because I can't find a simple circuit to accomplish my needs here. I need a mic for my computer and I decided I'd learn more by building one than I would by purchasing one.

Question by tgreathouse    |  last reply


Help please! Repairing trip-up!

Please Help!!! I need help to fix my telephone's mic! I have a telephone at home that was dropped many times and ultimately finished breaking something (e.i. the microphone) so while me being an aspirating electronic engineer (NOOB!) I tried to open up the phone and change the mic with a solution that I thought pretty smart; I learn some time ago that if you change the polarity of a speaker, you can use it as a mic so I naturally opened up the phone and to my surprise I find 2 freaking mics that look nothing like a speaker (or even a freaking mic for that matter) (Picture below). So I was asking myself... Can someone help me to change the mics in the phone with the speaker (Picture of the speaker below, any of the speakers are ok), by telling me about any changes that I have to do or any alert that this might not work (keep in to consideration the voltage, speaker type, and the polarity)... P.S. â€‹II was also thinking about changing the antenna because it's pretty weak!(Pics below). Any thoughts about that? And Thank You! Sincerely; Your hopefully future friend and companion: AntF

Topic by AntF    |  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


I need to repeat radio frequency in the 402MHz range.

I need to repeat radio frequency in the 402MHz range.  How do you build a RF repeater? I need to extend the range of a CGM (Continuous Glucose Monitor). It uses the MICS protocol.  Can you adapt an existing device?

Topic by arourke1    |  last reply


Theory, execution and actual construction of a 'Bullet-Shot Location' like system Answered

 How could it be done? I have revised a version using only two microphones that once one of the microphones 'hear'  the sound, a timer will start and will stop once the next microphone 'hears' it.  This would essentially enable you to draw a line straight down the middle of the gun. It would also allow for tracking the location in real-time. How could you physically build it for a cheap set-up. I'll upload a couple of diagrams some time.

Question by Lance Mt.    |  last reply


Which wire is positive?

I have an electret mic that I want to use, but it has green and a black wires on it, would green be positive? Or would black be?

Question by Zem    |  last reply


How do I connect my gaming headphone w/ mic that has 3 wires to a new jack that has 4 wires?

I have an older Turtle Beach headset I use for Xbox, but the jack that plugs into the controller is worn or just a tad too small, and does not keep a good connection.  So I cut the jack off of an older headset that was broken so I could splice them together.  But the jack end has four wires, a red enameled and a blue enameled, a white rubber coated copper, and a bare copper.  The headset has the same, minus the white rubber coated copper.  How do I connect these?

Question by shlugendah    |  last reply


How can I wire a recorder cut-in box?

So, a little background: I'm a reporter, and I do a lot of telephone interviewing. There's currently not an app that works reliably for my phone to record both sides of a call, and given that I already have a very nice standalone voice recorder (sony ICD820) that has line in/line out functionality, I'd like to have a way to run the signal from my phone into the recorder, record it, and then pass it on to a headset with a mic on it. The problem is that the recorder only has 3.5 mm stereo in/out (TRS), with no separate mic channel, so if I connect the (TRRS - mic/l/r/ground) cable from my phone directly into the recorder, then connect my headset to the 'line out' port, it ends up distorting badly, and not recording the mic channel. As a temporary solution I A) use two "Y" cables (one connected to the phone, and one to my headset) to split the mic from the audio channels, then B) feed the audio channels into and back out of the line in/out ports on the recorder, and then C) use a coupler to mate the two mic channels. This puts the recorder in-line on the audio channel(s) only, and routes the mic channel directly from my phone to my headset (picture attached). This works great, but it's bulky and delicate, and obviously only records the incoming side of the conversation.  THE QUESTION: How can I wire a box that will give me the ability to "cut in" a recorder on a TRRS source, which is delivering (potentially) stereo audio channels along with a mic channel - ie, up to three channels - so that the recorder is recording all three channells? (note: it does not matter if some/all of the channels are merged). WOULD IT WORK TO wire a box that A) summed the Left and Right channels from the phone using resistors on each channel (see the picture in the link), and B) fed the summed audio and the mic lines into the Left and Right pins of a TRS plug, respectively, to give the recorder a stereo source? I have put together a crude diagram of what I think this could look like (note that the diagram includes a DPDT switch to 'cut in' the recorder, but I would likely omit this in the final design for simplicity). Additional question: I have seen wildly varying info on what size resistors to use on the summing circuit, and also conflicting information as to whether I need a third on the ground (???). The simplest I have seen is just using a 1K resistor on each of the incoming channels. Given that these are just standard headphone/passive mic voltages, what size resistors would I need, and where in the circuit? Link to the simplest 'summing box' diagram I hve found for this type of application (top image): http://techtalk.parts-express.com/forum/tech-talk-forum/60443-stereo-to-mono-summing-circuit

Question by ThomasJ126    |  last reply


Is it possible to power a 5v device through a sensor that uses a 3.3v battery?

This is probably the stupidest question but i'm a total noob at this. I have a sensor which is powered by a small 3v button battery and a small 5v microphone which needs to be connected to the sensor so that the noise data can be transmitted over bluetooth because the sensor has bluetooth. The mic is connected through GPIO pins on the sensor. So I'm wondering if I can power the two together if the only power supply is the 3v button battery and the microphone needs 5v. Also any possibility that I can power the mic through USB?Thanks all. p.s. Round sensor shown in the picture below is MetawearCPRO, datasheet: https://mbientlab.com/docs/MetaWearCPSv0.5.pdf ebay link for microphone: http://www.ebay.com.au/itm/172013968121?_trksid=p2060353.m2749.l2649&ssPageName;=STRK%3AMEBIDX%3AIT

Question by DanzT    |  last reply


Outdoor listening installations

Would appreciate some advice on this project.  I'm putting together a proposal for a series of outdoor sound installations in a nature park.  a couple of the installations will be places where you can plug in headphones to listen to certain sounds captured live from a microphone in an interesting place- for example a hydrophone in a pond.  The plan is that the mic will be hooked up to 3.5 jack sockets and listerners will be able to plug in their own headphones.  Now obviously there needs to be some amplification because the mic signal level will be far too quiet to hear on headphones. I need a power amp that will be powered through a solar panel.  My question is, shall I just use a headphone amp, like the Behringer ha400 or make my own power amp circuit? I need to be able to make everything sturdy and fit into a weather proof junction box to protect it from the elements. I have done some experiments with an LM386 power amp module but there was so much background noise and it didn't pick up the mic level at all (may have been a problem with the mic I was using,it was a crappy little lapel mic.- I did get a signal from a piezo disc but it was again really crackly and noisy.)  If it is best to build a circuit with a power amp module, could people make suggestions of ones that will sound good and clean, and work with stereo headphones.  Thanks a lot Ash

Topic by AshtonM4    |  last reply


I have an old 1gb jWIN mp3 player that I no longer have a use for. Any cool ideas for a project?

The player has an internal mic and male usb output.

Question by sdanog    |  last reply


I wanna make steampunk lamp.

I wanna make steampunk lamp. I was thinking some kind a magical or science fictional lamp. Light that truns on when there's is a sound in a room, human voice or something like that.  Turns off when no one is making sound. I don't know what to use as sound cather.  I have old wooden candle leg. I think piezo is not right for cathing sounds like human voice in air. I don't wanna make lamp that turns off and on when I say on the mic something. I wanna make lamp that starts glowing when it catches sound. Turns off when it don't catch any sound like human vocie. I don't know what to use as sound cather. I think piezo element is not right. Maybe mic element or someting like that is better.

Question by DeathSuperMario    |  last reply


anyone have pinouts for a inline mic earbuds?? like the skullcandy ink'd??? im working on a project for my xbox 360 :)? Answered

Well ok so i bought skullcandy ink'd earbuds and i noticed that they have an inline mic which is really really cool cause it works really well with calls and as soon as my call is done i go back to listening to my music :3...and all of a sudden it hit me! what if i can use these same earbuds (with a little modding and soddering) for gaming and chatting just like a regular standard xbox microphone!? and even with game audio too! so i can hear everything that's going on around me also! =D once im finnished i can post the instructable for everyone to see since i had such a hard time finding the information cause no one really came up with this (as far as i know)  and make it easy for anyone else who wants to try it :) all im asking for is the pinouts (what the little rings on the plug do) and ill have most of the information i need to start lol thanks for taking the time to read this!! any help would be really really appreciated :3

Question by brivera-1    |  last reply


How can I make a small 3-4 inch bullhorn or something like it.

How can I make a small 3-4 inch bullhorn or something that I can talk into and then amplify it with a speaker? It does not have to be loud just something that will work. My plan is to put it inside of my helmet so instead of talking so muffled it will sound clear. The power source needs to be either 1 AA or 2 AAA. I need to know the parts to buy and the steps on how to rig it up. I was thinking of using my xbox headset mic and buying a $5 pc speaker but I have NO idea how to rig it and make it work or if its even possible without a circuit board. Portable microphone speaker is what i want to make or need to buy but it needs to be very very small >1.5" after I take it apart. Something like: Panda Rechargeable Mini Speaker

Question by HUNTER II7    |  last reply


can somebody give me a working circuit to make a clap switch? Answered

i tried this circuit and it didn't work but note: i used an old but working mic from a mobile headset note : this is 741

Question by top.boy    |  last reply


Need some help with a microphone Amp Answered

Hey everyone ! I'm trying to throw together a small audio project Using a electrolytic Mic, an amp, and a small speaker, Basically a Hearing Aid. I'm probably going to use small breakout boards (a mic pre-amp, and a power amp) then hook them up to the speaker but I would like to know if anyone has another Idea? Voltage can be 3.3-5V (Running off a Li-po) Speakers are 8-Ohm, 1.5W I'm not looking for outstanding quality, just clear enough to Easily follow a conversation. Preferably from standard components. Any Ideas? Thanks, Wired Mist

Question by Wired_Mist    |  last reply