Reworked Version w/ upgraded Power switching:

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If you want a cleaner amp, then change C2 to 470uF & leave pins 1&8 open on LM386? 

 Thank you for this, Brian! I never installed any volume pots into my CBGs.  MInd if I ask how one would go about adding a volume pot to this circuit?

From the Datasheet:

Upgrade to External Power:

 Thank you Brian! You rock!

 I am nearly finished building the version of this amp at the top of the page. Question... Why the little "U"-turn at the end of the positive speaker trace and not in the one at the bottom? I'm going out on a limb to risk sounding stupid, but is it to add a little resistance to that part of the circuit? Or, can I just run it straight off the edge of the board like the second, (revised) version?

 Thanks for any assistance you guys can give,


You could, it was just an extra solder pad?

OK, thank you very much! I am just making it harder than it is, I suppose. I presume nothing when it comes to electronics. I know next to nothing about it. 

Thanks again, Brian!

Howdy all!

 I was pulling the capacitors out to finish building this amp and noticed that of the dozen capacitors that I had bought, one was not a 16+ volt version, but a 10 volt. I remember seeing most places that amps like this use 16 volt capacitors. I was hoping one of you could/would enlighten me. The amp will not get anything bigger than a 9 volt battery or six AAs. Can I get away with the 10 volt cap or should I wait until I can get the 16 volt?

 Thanks in advance for any help.


If you’re using batteries they won’t have any problems? Generally, most use a voltage rating of around double or more than the operating voltage, just to be on the safe side. But, you’re not using an unregulated wall wart , so no worries?

 Cool beans. Looks like I am in luck. Thank you again, Brian. You ROCK.

 Off I go to the shop...

 Finally, after delay after interruption after delay, I got one of these to power a CB Gitty speaker and it sounded pretty good. Today I unhooked the speaker and soldered on a 1/4 in mono jack and put the amp between one of my CBGs with one of my homegrown low-z pickups and my Micro-Cube, with the LM386  as a pre-amp and ... wow... The difference is HUGE! Thanks guys again! This is exactly what these low-z pickups need when they need to be louder and overdrive an amp more. I'll try to get a sound file or two out in a day or so.


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