The EMY-63M/P Electret microphone capsule going from 20Hz-20 KC and its extremely good properties
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- Опубліковано 12 вер 2024
- Please read the description first. Video about the extremely good properties of an electret microphone capsule, type number EMY-63M/P. Say: a condensor microphone.
Its frequency range goes from 20 Hertz to 20 KC, and flat (!). And it is very cheap.
NEXT video (14 July 2024, microphone pre-amp on 3 Volt) is here • Microphone amplifier f...
The capacitor value (not showed in the drawing) to take out the audio signal can be between 470 N (=0,47 uF) and 220 N (0,22 uF). My best idea is: don't use electrolytics. They can/will deteriorate on the longer time (5-10 Years). Non polar caps. in the order of 0.47 UF (470 N) up to 1 uF (non-polar) will do the job for at least 10-20 Years (or more...).
I ordered it (a few of them, these electret microphone capsules) via the Reichelt website, Germany. And I am going to use it in a new (more simple) circuit of a “hearing aid for elderly”. It will be supplied by 2 (two) Carbon Zinc or Alkaline batteries. With that super good Electret microphone capsule.
Everything about this Electret microphone capsule is explained in the video, so that is all for this moment.
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These work very well. You can pickup people talking in the next room with the door closed with these. I have made a few circuits with them.
Another great video thanks from England
You are welcome, thanks. I hope it can be helpful for everyone doing audio experiments and, especially, making audio pre-amps, picking up audio, say speech, HiFi sounds, etc. Such a (cheap) condensor microphone with these extremely high properties can be used everywhere. It only needs a 1 transistor stage. 11 July 2024.
Yes, thet typically have a JFET (usually not the best) inside them.
Looking forward to the next part. 🍻
Thanks Barry, yes it works already after 1 day of experiments (3 transistors used). Perhaps I have to do some more, want to push the noise somewhat down, preventing the use of special low noise transistors.
Yes in deed 5mm microphone capsules sounds much crispier than 10mm ones. I found small mic capsules have almost flat frequency response, they are free from sound resonances at 10-12kHz (Helmholtz resonance), but they are not so good in bass region and little bit noisier
I use electret microphone for bat detector ( direct conversion receiver with electret mic in antenna's place ).
About 20...100kHz and more.
Thanks. That is very important info for another viewer of this video, also working on that theme. Good to hear your experience in this regard, thus many thanks! 12 Juli 2024.
wow!. an electrect mic?. I heard about that project many years ago... but with two 40Khz and 25Khz transducers in series. They simple tune the "red coil" in order to have the 40Khz tone in the center of the scale. I want to do the same concept but with the old MC1496 in order to mix and convert the bat signal. I want to experiment many mikes and preamps, and keep it simple. I have heard that good mikes cost arround 3000€... not in my budget,... 3 orders of magnitud deviation!. Thank radiofun232 to point me out this comment from ingussilins6330
wonderful black box(the case) !
Took some time to make it....Thanks.
Hallo Ko,
ik heb een andere soort maar zeker niet minder.
ik gebruik ze voor FM zendertjes, een TOR voor LF eentje voor osc. en een trapje er achter.
de eerste en laatste transistor is om de oscillator stabiel te houden. ( 3 BCtjes doen het al leuk! )
VrGr Rob
Bedankt Rob. Al die electret microfoon capsules doen het heel goed. In het oude schema van het "gehoorapparaat" (te vinden via de textbox in de eerdere video) heb ik er één gebruikt die ik ergens uit had gesloopt. Ben op dit moment met het versterkertje bezig voor deze capsule en ja, de drie BC tjes doen het goed! Moet nog wel wat werken aan de ruis en iets vinden op de oversturing als het microfoon signaal te sterk wordt. Dat is allemaal oplosbaar...zonder AVC overigens.... Het moet niet te moeilijk worden. Bedankt en groet, Ko. 12 Juli 2024.
these things can provide extremely good results , Zoom handheld field recorders uses them with outstanding results
Great information 👍
Thanks, good to hear that. It is a cheap electret microphone capsule with enormous good properties.
@radiofun232 yes I had bought some quite some time ago not sure if the same as yours but look similar in size. I used it on a valve project. I will have to see if I can find one them 😊 I have re loaded a video of it not great quality but you can see it at the top left of the valve..
Thanks 🙏
Thank you for this informative video. May i comment that the drawing could be misunderstood. We must not connect terminal 1 directly to the power supply but via the resistor only.
Regards.
Yes, completely true! I also had some hesitations, when drawing that (+) to that line, when talking about it in the video. But I tried to correct that, when videoing & talking, indicating the resistor, that is responsible for (say) the end-voltage to supply that EMY-63M/P chip between say 2 Volt and 10 Volt.
A very neat mic unit. Would it be suitable for use in an amateur radio microphone? I know I would have to supply power but that is no problem. Thanks for another interesting video.
Yes, surely. Though the frequency range could be too wide (say 50 Hz-20 KC). For amateur radio the frequency band is often limited, to make speech better intelligible. Thanks.
@@radiofun232 Thanks for the reply, you make a good point regarding frequency range.
i am looking for picking frequencies from 10Khz to 50Khz.... compllicated, yes!
This electret microphone chip can probably help in that case, having seen its straight frequency range/response up to sure 20 KC. Perhaps it can get to 50 KC, of course (in general) with some loss.
My idea is to make a bat to human audio converter...maybe also for recording etc. To convert the frequencies, I plan to use an MC1496 to "step down" the signal to human range. .. using heterodyned effect.,... I have put this project on hold for many years, and now your video reminds me that I have it pending...
perhaps, i'll need a "special pre-amp"
@@soulrobotics Very interesting idea!
@@soulrobotics Read the reaction of Ingussilins6330, he was also busy with that.