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Capacitors in an LM386 Amp

post #1 of 2
10/27/10 at 6:30pm
Thread Starter 

Hi,

I have a quick question(s) maybe someone knows the answer to.

I am attempting this circuit which is a reference design straight from the datasheet.
LM386.png

I don't really understand how amps work all that well so I was hoping someone could sort of explain it, though it doesn't have to be lengthy.

1.) How is voltage affected by a chip amp such as on the output of an LM386? I have a couple of solid polymer caps that are rated for 10V and are around the correct capacitance.

2.) Also what kind of voltage would be running through the cap between pin 1 and 8 of the LM386?

3.) How do you choose the right bypass capacitor?

Sorry if I am being unclear but I am not sure what to use.

Thanks.

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post #2 of 2
10/28/10 at 5:47pm

I use the lm386 in a guitar amp, I power it with a 9volt battery

 

the output caps I use 16volt and they seem fine, the cap between pin 1 and 8 is bypassing an internal gain setting resistor and with that cap you will have a gain of 200,

 

I use a resistor in series with the cap to give a gain control, for that cap 10volt.

 

The bypass cap anywhere from about 0.1uF to 4.7uF depends on whats in the parts box :-)

 

cheers

FRED

 

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