This was great, I was fixing an intercom system and wondered how these little guys worked

I found a fun thing about the condenser/FET mics recently. I had a suspicion about how sensitive they might be. I removed the felt cover and wired the mic to one of those little super hearing amplifiers Radio Shack used to sell. I then placed the Am²⁴¹ pellet from a smoke detector face down on the mic. Once you get the mind shattering feedback under control you can hear the gentle patter of raindrops. Those are helium nuclei hitting the mic at about 6% the speed of light. I was amazed the mic was that good and the alpha particles were that heavy. I am hooking it to my oscilloscope to examine the pulses if I get time tonight.

Thanks , I appreciate these Refresher courses you run.

You explained it very clear. I learned something.

Problem 3-13 in "Electromagnetic Fields and Waves" (2nd edition) by Lorrain & Corson deals with a microphone having an electret diaphragm. (The 3rd ed. has a completely different layout.)

Nice work! Never heard of using digital logic chips as op-amps! That is pretty cool!

Very helpful, thanks for your crystal-clear explanations

Thank you very much for the videos. I appreciate your video and times you spent making these videos. 👍💯

That same chip is used in some distortion/overdrive guitar pedals. I've used a couple discreet complementary power mosfets in a midpoint-biased CMOS inverter configuration using a pot with the wiper on the gate, one terminal on the drains, and the other as an input. I could control the volume by turning the pot to vary the feedback, and this setup allowed for much less than unity gain all the way to 0 gain. It was mostly an interesting experiment, but it also made for a nice low-power guitar amp that you could overdrive with nice-enough clipping.

Excellent Tutorial as usual....

you have some of the most useful and interesting electronic video's on youtube

That was very helpful, thank you. I like that room monitor.

You are brilliant...God bless you for posting giving.a great video

As good as it gets, me thinks. Thanks for letting us know how these guys work.

to the point explanation ... really appreciate your effort. Thanks

Great explanation :)

Awesome video. Much appreciated.

Thank you sir .... i really needed this

Great video. Thanks for your help.

ah this is what i was looking for, this video is so helpful

Thank you very much for the very detailed explanation

Inverters passed the signal a lot better than I thought they would.

My aviation headset has a faulty microphone, its an 80ohm passive speaker (2 terminals), can I straight swap that with a 2 terminal electric mic?

Thanks a lot.

Howsit bud, I wanted to make a mic to connect to phone to produce much better audio quality for my scratch track videos/song writing and had infact a few weeks ago bought the exact same looking mic as your 2 pin one in the video a few weeks back, only now had time to get into sourcing info and amping circuits etc, j don't know much at all about the inner workings of different mics to be honest but being a multi instrumentalist and having studied electrical and having done electrical sorts of hobbies turned profession as I own and operate a electrical (residential & commercial) installation and maintenance business I thought I'd give it a go, just one question though, will this mic render a much better audio quality than a regular cellphone or cellphone headset microphone? I will reply again with the model number of the one I have, I'm sure it's exactly the same as the 2 pin, quite a bit larger than that of a regular ear phone headset microphone, I want to "condense" the sound more, eliminate ambient sounds and just regular likely sounds that would disturb a recording.. obviously I am aware I am not going to get nearly the same effect as being in a glass booth at a music studio, just want better clarity than the phones mic itself.. you recon it's the one to do the job yeah?

Can these be made into stereo and used with USB-C on a android smartphone? I would like to make a mic that looks like the Sony ECMLV1 and Olympus ME-51S but has the EM272 and USB-C connection where you can just plug it onto your phone and then record video with a nice enhanced mic for lots of ambient pickup, is this possible?

Thank you!

Hi. Just a newbie when it comes to electronics. Just want to know if I can improve an existing headset mic by using a max9814. Thank you!

Another question: I have a recorder which provides 1.5V on it's 3.5mm jack, and then I have a ECM capsule which require 5V to get the optimum performance, how could I change the 3.5mm wire to power the ECM with 5V with an external battery? Would you mind giving a suggestion?

Thanks for your video. Would you help me? What do I need if I put two electric mic? Do I need some resisters in each mic?

Hey man. How were you able to connect the oscilloscope to the microphone circuit? Sorry if this is a bad question but I'm a total beginner at this and I'm actually doing something similar for a project, so any help would be appreciated!

3:46 That's a steady hand right there. I could swear it was a picture until you touched the breadboard

Earned a subscriber

What is the advantage or disadvantages for two pin and three pin ECM?

thanks, very goooooood explained

cool stuff:)

I have a 3.7 battery case with a negative and positive wire how do I make mine work ?

How hard is it to identify an Electret characteristics to determine manufacturer and part number?

Do you NEED the 1k resistor? Can you provide the mic with 3v directly without the resistor?

Can you post or make a video of how to make and hook up a circuit you mentioned that allows you to monitor a room or floor from the telephone system please.

What will be the output current from an electret microphone ? If we give in 0.5mA?

I see that you're active in the comments, so I'll ask you here: I'm looking for an analog circuit like this to use to activate a microcontroller from deep sleep mode. The thing is, the activation circuit needs to consume little power when idle as it will be on all the time(the whole system is battery operated). So my question is: do you think this circuit is the best way to accomplish the task I described above or do you think there is a better way to do that? If you have any ideas that may help, please just give me keywords and I can look them up. Thanks

ah, at last, Someone making sense from the 2- vs. 3-pin electret-condenser mic capsule choice decision-making process. it isn't the FET that is inside or not, but the resistor? But where is the resistor in the 3-pin? for current-limiting, is it? Thank You Maestro!

Hello, thanks for the quality content. I have a question - how does the size effect its performance? Some are thicker than the others and similiarly some larger im diameter. What effect does diameter and thickness have?

How small can electret microphones be constructed? Who makes them?

explain how op-amp amplifies information signal and cancels noise.???

If I use 2 pin mic & opamp like Lm358 or Lm741, why the output is not very strong?

How this microphone will sound with tube buffer?

which is the maximum output voltage?

Hi, great video, really helpful. I wonder if you could help further with a modification I am trying to make. I have a pcb which is a dmx controller for dmx lights. The pcb has a two wire ecm mounted directly on the board, such that the controller can detect sound and sequence the lights to the music. I would like to improve this: A- relocated the ecm via wires off the board such that the ecm can be placed in front of the speakers for a more direct sound recognition. B- replace the ecm with a jack plug such that I can connect a line out from the sound mixer directly to the pcb of the dmx controller. Option A is obvious but messy (though may have issues with the extra impedance of the wires?) Option B is preferred but I don’t know/understand if you can directly replace the ecm with a line out signal? Perhaps a resistor would be needed? Would I use a true line out, or a head phones output from the sound mixer? Does it make a difference? Can I mod the circuit such that it could take any kind of 3.5mm jack signal?!? Given I’m just looking to detect the beat, the actual quality of the measured sound signal is not that important. I’d love your thoughts/help on this? Thanks GC Ps I note that you gave an answer to anon yomous ten months ago on option A and suggested coax (great idea as I was worried about interference), but still wonder if option b could be achieved?

Can this setup hear from 1 - 2hz?

hi buddy nice project, this is along the lines of what i need to do or what i need for my project as i'm using speech rec and want to be able to hear my voice anywhere acrossmy house, i want to use multiple micro phones as well, would it be possible to shrink the project and maintain the high sensitivity pick up from the mic ? im new to mic but want to fast track on my project would you be interested in building what i need if i pay for it ? as it will save me time, let me know either way buddy thanks again and nice work

please help me sir .. im from Indonesia if mic condenser mark toa zm 360 replace condenser panasonic wm 61a is according to specs whether or can't function

Can u help me customised 1 spk and 1 mic headphone.

Could I just wire one of these to a guitar jack, and then run an instrumental cable to a pre amp or direct box that has Phantom Power ?

This video is timely. I need your input if you don't mind. I have a Chinese copy mic from Icom model HM-36. I need it to sound more natural and with a good gain. Which one should I use the 2 pin or 3 pin or you have a better option. Thanks in advance.

Hi, I'm trying to use a 2pin electret microphone to make audio measurements. I directly connected it to the mic sound card, but I get 50hz power supply noise. I also tried to power it with circuit like the one shown in your video (one resistor + one capacitor), but I get the same 50hz noise coming from the power supply or the ground. Is there an easy way to get rid of it ? like buying a pcb board already made by some experts ? I am not able to find any... Thank you !

Can you make a pressure cooker whistle counter? It would be a hit in India. Better still if you can make an app.

Where can one find 3-pin condensers? I've been searching all over, but haven't found any.

Would you know if it is necessary to replace one of these electret microphones with the same exact type or will any type perform equally well. Why I ask is because the replacement I am looking for is CZ034 and I am not getting much luck finding that type. It is for an analog guitar tuner that I am trying to fix. Any suggestions would be appreciated . Thanks.

Hi Nice project loved the idea of logic gate amplifier !! I've one question how to calculate the Load resistor for a 2 pin Electret Microphone like I've couple of those which I bought from an Offline store so I dont have a datasheet for them

Please build a low noise opamp for this or link me up to a resource with circuit diagram for opamp with a 3.5mm female output

Brother, what is the table on which you have laid something like a graph?

I have a Roland/boss br600 one of my inter micro condenser mics has failed. I cannot locate any numbers to find a replacement. Roland offered no help. Any ideas on finding a replacement.

can you tell me what different when different capacitances have the same capacitance?im wondering why you using different kind of capacitances.

I want to buy this, electret consider

if you cannot identify the polarity on the two wire mic and wire it up in reverse what will happen ?

Pro!

can we just line the mic and 1.5v battery in series? will it work?

Hello, is it possible to join a 2 wire electret to a 3 wire electret? I have a 2 wire mic but my headset takes a 3 wire plug. Is this possible? My understanding of this isn’t that great, thanks.

Hello sir, do you know where I can find that exact 3 pin microphone. I’m Looking for that model for a project. I can’t find it on the internet and that ECM is very useful for what I need it to do.

Can we use a 2 pin electret microphone as a speaker ?

Does anyone know some content that explains why you need a load resistor and the capacitor on the output?

Thank you. I found one inside my vape. Weird!

Hello! Is there a possibility to make this circuit work on 12V?

Is there any easy way to get a PCB mounted mic out of the PCB and on a long wire that's mobile? I wanted to move it closer to the sound source, but results were disappointingly bad instead of better. (My entire knowledge of mics is this video, and I'd be lying if I said it all makes sense to me. If anybody here has a spare moment, I'd be very thankful.)

Can you provide complete circuit of room monitor

Maybe it's cuz I'm new to all this but I'm even more confused

There should only be one cord. #StaticVoltage #Electret

Hello could you test this software? inspect androidcircuitsolver on google!

In some electret condenser microphone, amplifier is not included. [ True /False ]

Styx

Many times i make this mic but not work so pls kindly send me exact materials and material names sa soon sa possible

so basically you can use an inverter as an amp

Should the ac coupling capacitor be only from 3 uf to 10uf or can it be more

Bugged his own phone line. Putting some poor NSA worker out of a job.

On the schematic section please remove that d*** pencil so we can see all the details.