How to make: Simple Mic Amplifier 

Interesting. I will remember to look for this, as I examine LM386 Variations. I'm not focused there just yet. I am just finishing up getting familiar with the NE 555 timer. I noticed these similarities you described in the 555 circuits I examined and built, regardless of the application, I built the LED police flasher, as well a transistor checker tester, and the 555 generally gets set up with same jumpers 2 to 6, 4 to 8, 10uf cap between 1 and 2, and ect. I have found that after completing the builds, changing the caps often improves the result, if not required to even to get it to function. Voltages are not always Identical, as well transistors might be diff ID#. You say "specify" are you set on this standard, and, or have you experimented with diff values? If yes I would be interested in your experience. If not some little tricks, at least it may save some wasted time. Thanks.

Thanks for helping. I am needing the mic to pick up a sound from a few feet for a VU meter Led made strip with my Nodemcu. Do I only add the 10uF between pin 1 and 8 and no resistor in series. Also the pots have 3 pins I think the wiper is the middle pin and the other to be connected, but where does the 3rd one go. I assume to the ground. and is the input cap connected to lm386 pin 3? Thanks for any additional help.

Thanks yes this circuit was aimed to use the least amount of parts. Leaving the gain pins open yields an amplification factor of 20.when I snapped my fingers it was a gain of 7.5 probably because I wasn’t using a large enough rail to rail voltage supply so it maxed out. You can boost it up to 200 times using the cap however be mindful of your power supply voltage that you don’t peak and distort your output due to a low voltage ceiling.

@@MostElectronics I have it built and I connected 1and 8 with the 10 uf cap and put a 10 k pot with the wiper on pin 3 the other side with mic output. I seen it makes a gain of 200. I have not tried it. Kinda waiting to hear from some other posts if it's ok. Do you know?

@@retrorocketman6969 make sure your supply voltage is high enough or else you’ll just peak out the amplifier and everything will be distorted

@@MostElectronics that is a good point and thanks. Now my thoughts are to pull the data sheet to get the max voltage on the electret mic and lm386 and set a max limit to prevent overlo and use another adj trim potentiometer. To obtain the best operating voltage. Does that sound ok? I surely don't want to smoke my IC because I'm limited and can't buy any.

not enough gain. LM741 do not provide enough gain

...any microphone would do that. What you should ask is how to build one that can detect that at a longer range or with a smaller microphone.

Also to filter out ambient noise

It's possible, however you do not want to overdrive your recorder input. If you have an oscilloscope you can use that to see what is coming out of the tape machine. if you replace the mic with the tape machine you may just hear distorted music because the amplifier providing the gain for the mic is only expecting a few millivolts. If you put in 5V it will try to boost that and distortion/noise will occur.

@@MostElectronics thanks for the feedback. I got really into circuit bending recently, thought I found a mod on this toy keyboard that had a mic built in (cutting the mic and wiring a 1/4 input to the wires.) and It worked, I would get really cool crunchy distortion when I played my guitar through it. I checked it with a multimeter after watching this and found the same 5v you used in this circuit. lmao thats what I get for assuming I found a mod that no-one else in all their experience circuit bending have found. got some sweet recordings though and as far as I know my instruments I ran through it are doing fine. now I know. THANKS.

@@shawnlennon1947 sure, glad you are able to enjoy the distortion effect

He did. Watch the video.

Just download LM386 datasheet from TI Website for revision D. They have schematics and much more.

The current is provided by the resistor from the positive voltage. It turns on the built in FET inside of the capsule which generates our small 400mV signal from the snap

What’s the difference

@@harrisonartz8387 Acceptable supply voltages, output power, etc. It would change the values of external parts. If a tutorial is done with a -1 and someone gets themselves a -4 (or vice versa), things won't work the same. That small detail is easily missed by people purchasing off Amazon.

It shows the 3k resistor going to ground, which is obviously a mistake. He did it right on the breadboard going to the positive rail.

I think it's a good presentation, perhaps not outstanding.

Lmao no

www.ebay.com/itm/20Pcs-Electret-Microphone-Inserts-6050-with-PCB-Pins-Condenser-BHCA/173828106106?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D20131003132420%26meid%3D0dbbb6aeebac4f279328c396cf618756%26pid%3D100005%26rk%3D3%26rkt%3D5%26sd%3D332068106797%26itm%3D173828106106&_trksid=p2047675.c100005.m1851

well i bought 10 micros electret from mercado libre , only 6 pesos a piece

Sure

You can. Electret capsule requires 0.5 mA current at 2 V so at 9 V source, you'll need (9-2)/(0.0005) ohms resistor. Simple. Now add DC blocking capacitor that shall act as a high-pass filter as well with capsule's resistor. The -3 dB cut-off is too be decided around say, 5 kHz; choice is yours, however.

This video really helps. It works absolutely fine with no problem thanks for this once again.

only 5v and ground

Piotr Szewczyk check the description

What kind of microphone? The circuit in this video can be used as a pre-amplifier or PRE-AMP as you call it. If it is the microphone used in this video then yes its going to be very quiet if you just plug it into a computer mic input. If it is not then you may have to just adjust a gain setting on the computer program.

its a $10 microphone called "Earamble BM-800" it says its a "[Cardioid Pickup Pattern for Broadcasting & Recording] what ever that means. i think they call it a "condenser" i have one that i think is called a "dynamic" that also has very little sound. this is a regular problem that most people face you should do a video on it.

5V

3.5 k resisters doen't exist , should be 3,3 or 3,6 regards from mexico amigo

PAKYU

There's one toward the end of the video. It's a little messy, but it's clear enough.