Voice Spectrum Amplifier

279

03:09:25

Even before I started messing around on a breadboard I always thought it'd be cool to make my own parabolic microphone. Since then I've built a few amplifier circuits looking for the right circuit to place at the heart of the dish. Each one has had its own pros and cons, but I've never simmed one with such great results as this one has. As of right now I haven't built it for real to test it out but, the predicted frequency response is spot on! Check it out for yourself by swinging the a.c. voltage low and high, observing the corresponding output power. This is an internet replica (apologies to the author for forgetting your name) but the called for chip is the TL072..
#Correction/Addition# -- By "swing the a.c. around" I mean to say the Frequency, not the voltage itself. This circuit seems to amplify the human voice heard from around 800Hz to 2 or 3KHz+ pretty well from what I could tell. But understand that the amplitude of the subject's voice plays a role as well, which I haven't quite figured out how to sim yet. *shrug*

published 10 years ago

lenzrulz

10 years ago

Very nice Sine_eyed

faceblast

10 years ago

tl072 is great for its 10MΩ input impedance, it can pick up very weak signals

Sine_eyed

10 years ago

I'm still trying to wrap my mind around impedance matching between stages. The 47K at the output says to me that this is a pre-amp stage. Is that right?..

faceblast

10 years ago

it means that if the input of the next stage has less than 47kΩ of resistance/impedance, then your output signal will get absorbed.

faceblast

10 years ago

so: yes it's a preamp, you won't make a very loud noise from any speaker with 47kΩ of resistance there

stanislav_maslovski

10 years ago

u can use Bode plotter to see the frequency response (i mean, no need to sweep the source frequency manually).

Sine_eyed

10 years ago

Oh yeah! I forgot all about that thing lol, thanks @stan..

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