Hi,
This is my first BYOC build. Had I known that it was going to be a 'difficult build' I might have tried another first, but it was the phaser that I wanted... anyway. If anyone can give me any help at all I would be very grateful.
Images here.
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My notes and things I've noticed:
The LED lights when the footswitch is on.
Signal gets through on bypass. Clear, clean guitar signal; no problem here I think.
When the footswitch is on the output signal is very very weak, (I turn up to full on my 250W Ashdown and I can hear it; just.).
The IC's get the following multimeter readings (V):
IC1 1 = 4.02, 2 = 4.03, 3 = 2.68, 4 = 0.00, 5 = 4.68, 6 = 3ish and reducing over time, 7 = 8.97, 8 = 9.58.
IC2 1 = 4.84, 2 = 4.86, 3 = 3ish and reducing over time, 4 = 0.00, 5 = 0.20, 6 = 0.05 , 7 = 8.99, 8 = 9.58.
IC3 1 = 4.03, 2 = 4.02, 3 = 4.00, 4 = 0.00, 5 = 4.01, 6 = 4.01, 7 = 4.00, 8 = 9.58.
IC4 1 = 4.02, 2 = 4.01, 3 = 4.00, 4 = 0.00, 5 = 4.00, 6 = 4.02, 7 = 4.00, 8 = 9.58.
IC5 1 = 4.02, 2 = 4.01, 3 = 4.01, 4 = 0.00, 5 = 3.97, 6 = 4.02, 7 = 4.01, 8 = 9.58.
The potentiometer labelled 'feedback' gets no readings on the multimeter at any point no matter the position.
I've checked the components when I first assembled the board and also after I realised that it wasn't working.
I have re-flowed as many of the solder joins as I can get to, even lifting up the pots in the middle so I could try to get to the covered ones.
Having checked previous posts I know that the readings on the IC's are not as they should be. If this is the case, what do I do next? Where should I start to find faulty components? Are the IC's with the 'different' values assumed to be 'dud' / 'fried' / 'corrupt'?
Which parts of the circuit are likey to be OK? Which parts should I focus on for rework?
Any help would be appreciated. Thanks in advance.