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Comment by David McQueen on April 9, 2017 at 12:02pm

Lol ... No stupid questions, just frustrations. No. I hook positive to positive and negative to negative. Starting at the jacks, positive wires for left and right jacks are hooked to positive for leftb and right inputs. four wires rogether. For negative, starting at the jacks, negative from left and right are both hooked to the common ground input for both channels. This is why I had soldered wires from the board and the jacks and used marretts to bring it all together.

Comment by Tim Mooset on April 9, 2017 at 11:35am

Forgive me for being stupid..totally new at this. But aren't you mixing positive and negative wires under the Marret connectors? Thought they need to be separated. Still no joy. Got power but no signal from jacks.

Comment by David McQueen on April 7, 2017 at 12:20pm

I had a wire from the amp and a wire from each jack and each channel to the amp and connected them all  a marrett.

I idd the same with the ground

Comment by Tim Mooset on April 7, 2017 at 9:30am

One more thing on point #1 imput. For mixing imputs before the amp do you solder a wire from (+) of jack #1 to (+) jack #2?

Comment by Tim Mooset on April 7, 2017 at 8:47am

Thanks David..that sure helps. The board is so tiny. I have added headers/connectors to give me a fighting change to get my solder right. I will try to wire a new one up this evening. I only have stereo guitar jacks on hand so hopefully they will work.

Comment by David McQueen on April 7, 2017 at 5:47am

One further thing: all the marrett connectors you see were just so I could solder onto that amp board and solder on to other things separately and then just connect them together. Then if something failed, just uncuple at the marrett connector.

Comment by David McQueen on April 7, 2017 at 5:42am

If you look carefully at the board, you will see

1. input - left, right and ground. so,it is a common ground for both channels. Your guitar jacks come in here. I made it so either jack goes to both channels, ie: the inputs are mixed prior to hitting the amp.

2. Output. There are two separate outputs, one for each channel, each with + and -. I wire these directly to two speakers. I did not try to wire them both to one speaker. it is my understanding that this could do some damage.

3. There is power in. It has a + and - . This amp is made for a USB power supply. I am using a 5 volt DC, 2 amp wall wart I picked up at a hobby shop. I have put a power switch on the positive line. I am not sure if attaching these backwards will blow the board. It was a warning on the larger board I had.

A few things. The board is small. Make sure your solder connections are not shorting out. I actually fried one board (if I remember correctly it was something like 5 boards for 5 bucks so I just threw one and got another one). The picture you have above is me testing the connections out on the kitchen table before installing it in the box.

Comment by Tim Mooset on April 7, 2017 at 3:20am

David do have any closeup photos or detailed Instructions on PAM8403. I bought a few of them but am struggling to get mine to work in guitar amp form.