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crivoli said:I am using
1K resistors for Rb,
a 1M resistor for R2,
a 1K resistor for R1,
a 10uF cap as already seen,
a .47uF cap for the coupling cap from the mic to the IC,
a LM741 IC and a 68uF cap out of the IC to the speaker....
Sorry for not posting the specs
That's true but aren't you being a bit presumptuous?Ron H said:I wonder if he has a bias resistor for the electret microphone. It is not shown on his schematic.
Perhaps he wouldn't have ANY output if it were omitted.
I'm not assuming anything. Perhaps you should read (or re-read) the first post.Hero999 said:That's true but aren't you being a bit presumptuous?
You're assuming he's using an electret microphone, how do you know he isn't using a headphone output or even a dynamic micropohne?
Yeah, I never tried that, but it's sorta what I figured. A JFET doesn't do much without some current flowing through it.audioguru said:I tried screaming into an unpowered electret mic that was connected to a high gain amplifier. Nothing came out.
Jack Luminous said:Hi, I finished an LM386 based amp this week and was wondering if there are any other IC's that I could try out in place of the LM386; a direct equivalent with the same pinout that I can drop right in the socket. I'm mostly curious to know if there is a chip that consumes less power so the batteries can last longer. Also, is the LM386 considered to be a power hog, or is it pretty efficient compared to similar chips?
I'd also like to know about LM386 equivalent chips that can produce more volume output as well. I will use the amp plugged into the wall outlet sometimes and wouldn't mind having a chip I can drop in for more volume when current consumption and battery life isn't a factor.
Lastly, can anyone tell me the most efficient power amp IC('s) they know of - regardless of pinout? Something that provides a reasonable amount of volume and will not drain batteries quickly. Any tips on limiting current drain when designing an amp circuit? I'd like to build a very energy efficient amplifier in the future.