audio amp finished. made it as small as possible using the least number of parts. have the lm386 chip with the 10uf cap bridge between pins 1 and 8 to amp it produce its max gain (200).
its about as big as a dollar coin. uses a couple of 100uf caps a 0.047uf ceramic cap, a 10ohm resistor, a 10uf cap and the lm386 (well not really im using the equivalent called the NTE823) the red wire to the bottom right is 5v in coming off the nes board, the red wire at the bottom left is the amplified signal going to my speaker, the top red wire is going to my 1k pot, and the black wire at the top is my ground.
the soldering job is way neater than my regulator. i'll link the schematic i used at the end of the post. if anyone's wondering the thin piece of wire connecting the three pins is just a big ground rail. its the negative side of the ceramic cap that i just connected all the negative posts to and then soldered a black wire to it so i can attach it to ground somewhere.
im using temp wires on the pot for testing but they will be black and red and such for positive and negative. the way i hooked the pot up is negative on the wiper pin (usually middle), and the wire going to the amp on one side and the weak audio signal to the other side.
schematic that i ripped off a larger voice scrambler schematic.http://i.imgur.com/2Hz8F.png
or if you want the minimal version provided with the lm386 here it is. (the lm386 and the nte823 are basically the same chip the pinouts are the same and both have pdf versions of their datasheets online)http://i.imgur.com/REfHB.pngThis post was edited by AbDuCt on Jul 28 2012 05:30pm