Wonderful facts about Electret microphones
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- เผยแพร่เมื่อ 25 ส.ค. 2024
- Maybe you have worked with capacitive microphones already, but most of you don’t know what is going on inside them. This causes many ambiguities. In this video you will see a full explanation about electret microphones. Also you will get answers for these questions below.
How a capacitive microphone works?
What is inside a microphone?
Why there is a MOSFET inside a microphone?
What is a voice signal?
How to interface a microphone?
Are microphones polarized components?
Do microphone have polarity?
How to know which terminal of microphone is negative or positive?
How much current can pass through a microphone?
What is difference among capacitive, condenser and electret microphones?
How to see microphone signal on oscilloscope?
Here in this video you will get answer of these questions
It's a FET but not a MOSFET.
I Just made the same comment before reading yours.
That was my mistake, thank you for mentioning that
so, if it's not a metal oxide semiconductor, it has to be a junction field effect, yes? am i right to think that metal oxide surface passivation turns FETs into switches, while this device is operating as an amplifier?
A JFET it is. Very useful video. Thanks elewizard. @@gazrgazr2394
Thanks. Nice, well thought out video. I liked the description of the mic-as-resistor. The 2SK596S is a N-Chan JFET, though. I think you said MOSFET, which is similar but more sensitive to ESD static damage. Keep making these brief, very informative videos!
Glad it was helpful! And thank you for the point 👍
Thanks, very well described the function of capacitive microphone.
Yet another fantastic video. Your way of looking at electronics is so refreshing. Thank you.
Glad you like them! 🥳
Thank you for improving my knowledge.
My pleasure, thank you for watching
Electret microphones work better with a bias voltage over the capacitor gap. This is where a coating of electret material comes in. An electric field is applied to the material at a high temperature. On cooling the material 'remembers' the field and this acts as a bias voltage in the capacitor assembly. As the plates vibrate and the distance changes it causes a charge to be fed to the gate of the jfet.
Great point.
Thank you👍
🎉 I just love your energy ⚡... 😁👍
😊 thank you so much 🥳
JFET with internal gate-leak bias resistor. I was hoping to find out more about the electret material used...
The material is usually polyvinyl fluoride aka kynar material.
Excellent 👌
Thanks a lot 😊
Love your videos & the way you explain things - thanks. Since you make things simple and clear, I would love to see your videos on Op-Amps, 555 timer, Amplifier Classes (A, B, C, D, AB) & more...
Also, it would be great to also do a "Series" of videos on 'practical projects' (from design to building the circuit) like:
- Variable output switching power supply
- Audio Amplifiers (Class D) - including Pre and Power Amps plus the required power supply for this amp
Once again, thanks for these great videos, eagerly waiting for more...
Thank you for watching. Some of your recommended subjects are in my todo list 🥂
Perfect ❤
Thank you so much
These videos are getting better each time, keep going!
Glad you like them!
now again very useful informations condensed in one site, much more than lot of theory that someone have to study for months before to get same informations. Thank you
Great to hear that!
I have some questions for you!...I'm interested in condenser microphones, I really liked your tutorial, thank you.
1- Since the capacitive microphones are mini, can they be good pickups for guitars and similar stringed instruments?
2-Are there advantages and disadvantages?
3-Do you have a video about designing and implementing a circuit suitable for this?
4-Do you have a more advantageous mini microphone suggestion as a capacitive microphone alternative?
Hi, I appreciate your kind words.
1.i have no experience in this area. Instruments and music in general.
2.IDK 😅
3.No 😅
4.not really 😅
Thanks!
Thank you so much for supporting me ❤️
Good video subscribed immediately because it's informative and sincere
You are very welcome my friend. Glad you found the video helpful 👍
Very nice tutorial thanks! As a suggestion, this is one situation where an analogue (pointer) meter would be useful to show slow moving and transient changes.
Thanks for the tip!👍
I really enjoy it! thank you!
Glad you enjoy it!, cheers
Ahh thats what those things are, nice break down. Ive been salvaging these from discarded vape pen cigarettes (mainly for the battery) and was mystified how they worked. Well i knew when you sucked it turns on the vape pen, the air moving through it activates it somehow, they even seal the edges with rubber so theres good suction/air pressure on the mic. Now it makes more sense. I never thought of them as microphones however just an air activated switch, but tehcnically blowing air is the same thing as talking so its the same thing. Very cool.
Yeah, that is really cool.👌
Unfortunately the sensor in a vape is not a microphone, but just a pressure switch i.e. on / off. But these microphones are very cheap to buy online! I'm still looking for use for the pressure switch in a vape....
Actually I just took one apart and its the same thing! Same parts and everything, well almost the hole placement is alittle different on the front case and also it had 3 leads comming off the bottom(so you can hook something up for switching) instead of 2 like here in the video and the IC has 5 legs. But everything else is the same with a diaprhame and little red ring to seperate them. So they did turn a microphone into an on and off switch... heh makes sense as it wouldnt take much to use the vibration signal from a mic to turn something off or on which im assuming the more complicated IC handles, setting the threshold, timeout after a certain amount of time etc. I wonder if its a hard on or off, probably not, but only one way to find out. @@mikepanchaud1
The only difference is the cape pen version is an all or nothing device, the jfet controls a mosfet so it acts like a pressure differential switch that latches for a preset time when triggered.
Thank you
From Morocco
You are welcome ❤️❤️❤️
This was great, thank you
Thank you too for watching
One great thing about videos is that you don't really have to explain each thing that is going to happen in advance since people watching the video can see and hear those parts too!
Good point!👍
Most underrated channel
Thank you so much ❤️
I love your way of explaining things. For some reason I can follow you and understand it very well.....after a few times. Keep videos coming please.
It is comments like yours that inspires me to keep going, thank you for being a part of the community 😃
Nice.
Thank you! Cheers!
مهندس واقعا عالی و لذت بخش بود. ویدیوهاتون خیلی مفید هستن.واقعا لذت میبرم از تماشای ویدیوهاتون🌹. منتظر بعدی هستم😊
Thank you dude. Keep watching
سلام. مشابه این کانال در کانال های فارسی نداریم؟
2:48 in my trivial but still interesting scheme, I noticed that it works (I am talking about two 34 mm piezo disks ) but since I did not supply the piezos with 5V (I clearly get a poor and insignificant result). Pcb preamplifier voltage range: 5V to 15 VDC. I chose 12 VDC so I have to apply a resistor (suppose I= 20 mA ----> 0.02 A ) of 350 ohms 1\4 W.
Thanks for sharing 👍
thank you! 👍🏻
You are very welcome 😊
Hooray, new Elewizard video! 🎉
My pleasure 🍻
Great video!
Did you make the amplifier video for the speaker?
Yes, I did. It is just next to this video in the channel. Here is the link to that
th-cam.com/video/gnHuzM8PDrc/w-d-xo.html
Thank you buddy, yet another great video. I'm looking forward for the next ones ! You have a gift to explain thing simple and very clear :)
Glad it was helpful, next video is about a simple audio amplifier 📢
Excellent . Thank you !!
My pleasure
One way to build an extremely cheap radiation detector is to gut one of these for the FET and wire a PIN type photodiode across it. Then follow with a simple amplifier. Just make sure its put inside of an opaque and conductive case of some sort. ❤
Thank you for being a part of the community and sharing your knowledge❤️
I cannot find the datasheet for these microphone capsules " OB22P40 40dB 10pf+33pF - Electret BSE " ... . I will try again to review ... . Would you be able to tell me anything? Would you personally buy them? Thank you very much.
There are datasheets on the internet. Check out alldatasheet.com
Also other websites
Such a wonderful knowledge
Thank you so much 😃
Well put. Much obliged.
Thank you so much
Please make that microphone to speaker video!
Wait for next videos. In next video I will make a simple megaphone 📢
Correction , it is N-Channel JFET transistor and not MOSFET , different component structure and operation ... Refer to 2SK596S by either SANYO or ONSemi ....
Thank you for correcting me.
That was my mistake
Great channel man. Thanks for share your knowledge
My pleasure!
Very clear and informative: thank you! 👍🏻
Glad it was helpful!
I literally just started working on a microphone circuit and cant figure out the amplifier circuit I need to use
Thank you for explaining the details behind the electret microphones, could you explain what peak current (after DC coupling) should I expect from such a microphone? I connected my mic to a 5V source thru 1k resistor
I'm waiting for the next video!
In the next video, I will explain a simple audio amplifier and make a megaphone 📢 using basic components.
The only downside is that the electret can be ruined by too much heat, and their output supposedly declines some over long periods of time.
Sir, please make a video about FM transmitter and receiver, with deep explanation🇧🇩
As soon as possible
به به مهندس ناظری عزیز
Eradat
I want to know about your cutting mat. Is it just single layer or 5 layer.
I am not sure, maybe it is 5 layer but it is not single layer
can i use 12V supply voltage with 4.7k resistor in this circuit
Yes, I guess
Thank you
You're welcome
💖💖💖💖
❤️❤️❤️
+1 subscribers!
Cheers 🍻
I have mics that are 60 years old. Will an electret get waker after 60 years? We don't know.
It depends on some parameters, but usually they shouldn't get weaker 👍
The 596S is not a MOSFET like you said at 4:17: it is a good old fashioned channel-N J-FET. A have a box full of them...and at 4:27: MOSFET again.
That was my mistake, thank you for mentioning that 👍
مطلب عالی بود . آب واتا چی میگه اون پشت
Thank you for the compliment.
The water is for drinking 😁
Geiger counter principe
I was always wondering if the vape pen I discombobulated from China dumping them here were secretly bugged spying devices lol ':D!
It is just hearing a lot of air, like an unprotected speaker in the breeze, to activate the coils inside :).
Yes, exactly. 👍
Yes . The tiny switch which connects the battery to the heating element looks interesting