Re: audio amp with dc output?



Jamie wrote:

Eeyore wrote:
Frank Buss wrote:
Phil Allison wrote:

NO HE DID NOT !

I want to make a device that amplifies a signal from a microphone and puts
out a dc signal up to 3 volts based on the sound volume. 50mA should
suffice. 3 volt supply for the circuit.

How accurate do you need it? Could be as simple as using a quad OpAmp, like
LMV324, two OpAmps for the mic amplifier


TWO ! ?

and one or two for the integrator,
with an additional transistor for the 50mA output,

And where would the rectifier come from.

How would you plan to get a 3V 50mA output from a 3V supply btw ?

You have no vision..
Dc-Dc converters
Low voltage type 555's performing a voltage doubler.

Yes I suggested that kind oif thing but I thought you'd overlooked it since you
didn't mention it. He is a newbie after all.


Rail to Rail Op-maps..

@ 50mA ????

Graham

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Relevant Pages

  • Re: audio amp with dc output?
    ... suffice. ... Could be as simple as using a quad OpAmp, ... Low voltage type 555's performing a voltage doubler. ... He is a newbie after all. ...
    (sci.electronics.design)
  • Re: audio amp with dc output?
    ... out a dc signal up to 3 volts based on the sound volume. ... suffice. ... Low voltage type 555's performing a voltage doubler. ... Rail to Rail Op-maps.. ...
    (sci.electronics.design)
  • Re: audio amp with dc output?
    ... Frank Buss wrote: ... out a dc signal up to 3 volts based on the sound volume. ... suffice. ... Could be as simple as using a quad OpAmp, ...
    (sci.electronics.design)