Electret Microphone Single Supply Preamp

220

03:20:58

Powered electret microphone meets 741 with a single power supply. Output has a 4V range. Input is simulated by 10 mV AC. Built this with a 386 instead. Working OK. 

Preamp based on Bitluni's YouTube video.

Now with added power LED.

published 9 years ago

Sine_eyed

9 years ago

Deciding on a power amp now?..

hippodribble

9 years ago

Maybe stereo with noise cancelling. Or quad with 2 pairs of stereo mics with different angular separation, like an H2.

Sine_eyed

9 years ago

You mean like noise canceling headphones? That would be neat. I'm not sure if I've ever seen a schematic for that actually- I doubt Bose is gonna tell anyone how they do it lol!..

hippodribble

9 years ago

Worth investigating.

Sine_eyed

9 years ago

Yeah I think so too. Think I might have to take a look around. I'm sure there's a schematic for it out there somewhere, and an article on how it works would be a good read I bet..

Sine_eyed

9 years ago

BANG! Ask ands you shall receive hehe... http://www.johncon.com/john/SSheadphoneAmp/

hippodribble

9 years ago

That's for surround sound and more realistic spatial bass. They mix the low frequencies across both channels to sound like a speaker. For cancelling, you subtract environmental noise from the music to reduce its apparent loudness. So you need a mic in your headphones. For recording with cancellation, you could put an additional mic half a wavelength away and add it to the voice mic to achieve something similar.

Sine_eyed

9 years ago

Oh, ok. Well I was looking around some more last nite and found a couple cancellation circuits. The schematics were pretty darn complex- I think one had at least a dozen OpAmps! It'd be kinda tough to simulate here, at least all at once..

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