![]() ![]() measured on the back leg of the 220uF cap, promptly dropping to zero and (2) with the pot "OFF" all the way, I see about 0.050V, constant, measured on the back leg of the 220uF cap. Two things that I know for sure are that (1) with the pot "ON" all the way, I see varying measurements of 5V, 8V, 10+V, etc. My guess is that I'm discharging a cap when I touch + and ground, but that's just a guess. I have to take the leads off and wait a bit before getting significant numbers. ![]() When I use my MM to test voltage, the numbers are all over the place and usually drop to zero after a split second. Apart from the 10K linear volume pot and the mono 1/4" jack for the guitar plug, it uses only an NTE823 chip (apparently identical to an LM386), a 220uF 50V cap (I could not find a 250uF), a 0.047uF 100V cap (I could not find a 0.050uF), and a 10ohm 1/4W resistor. My build is shown in the attached photos. ![]() I'll stick to your version for this post. However, I get absolutely no sound from any version tried not even a buzz, hum, snap, crackle, or pop. Yours is the first I have found with detailed wiring of the 10K linear pot used for volume. Before finding this design, I tried several almost identical LM386 designs with no success, using a 9V battery supply or 12 DCV power supply from a Sony BlueRay/DVD player. I'm an electronics noob (and beginner at guitar). I tried to make this amp for use with an electric guitar. ![]()
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