I have finished populating my circuit board and have began testing everything, but I get nothing other than a loud buzzing sound. I started off being able to hear the trigger input through connected speakers through both sets of trigger points but after having started checking things, resoldering a few possibly-suspect joints etc that has gone, only the buzzing remains. This gets worse when I touch the volume and tone pots, and some other random bits, such as the bare metal round the lower right hand screw hole. I guess maybe I have 2 problems: the buzzing is a grounding problem, right? And the other being that it's not working.
I'm using a Beatstep Pro to trigger, using a 100k and a 68k resistor in a voltage divider which gives an output of about 4.7V which should be ok?
Got all the components as listed from Tayda, except, I got a J107 JFET as I read "somewhere" it was an acceptable replacement for a J201, the tantanum cap and the 47uH inductor from Farnell.
Using a 12V PSA from a Behringer mixer to power which works ok with the mixer, but I've also used a Boss 9V.
Had a go at testing the voltages at various points with a multimeter, got power going through some and not others so I'm going to map these when I get free time. Funny thing is I'm getting roughly double the voltages that netpusher wrote on his photo on the initial post - just over 12V near C4 and C33 and just over 19V on that leg of the chip and near C2.
Please help! Have I broken/overheated something? Is it my bad soldering? I reeeeally want this to work, it seemed so straight forward from the guide...