Looking for advice on how to trouble shoot the FL301 flanger from tonepad

[malachi]

I have assembled the tonepad pcb with the components from the list but I am not getting any wet signal from the board. At first I did try to build the complete circuit with the charge pump and stomp switch in place but when I got nothing out of if I eliminated everything except for the pcb, two 9 V batteries and no switch. I have the three pots in place and the input/output jacks and the signal definately travels through the board but it has no effect of the dry sound going into the circuit. If I remove the batteries, no sound comes through the board. I was wondering if I were to take voltage readings at the appropriate places maybe some one could help me trouble shoot the circuit. I could also take a picture the circuit and a schematic if necessary. Being truthful, I do not have a clue how to trouble shoot this circuit so any help would be greatly appreciated. Mali

[armdnrdy]

http://www.diystompboxes.com/smfforum/index.php?topic=29816.0

[malachi]

armdnrdy, I appreciate your post. It is almost as I mentioned in the OP but thank you for your reply. I will gather the pertinent data and repost my question,

[bluesdevil]

I recommend making an audio probe and tracing the signal path. It really has helped me a lot finding cold solder joints or shorts that caused me problems.
Or take a close look with a magnifying glass and use the continuity checker on your meter if you find pads/solder blobs too close together for possible shorts.

[malachi]

Thanks bluesdevil, I wish I had retained my old ocilloscope but like many things, I thought I would never need that piece of equipment again and let it go. I am going to follow armdnrdy's advice and put together the data with some other info and repost. I do appreciate your reply, thaks

[malachi]

bluesdevil, I am going to need to apologize for shrugging off your helpful post earlier. I simply didn't drink the full glass of cool aide and when I finally google fu'd audio probe, I discovered how useful that would be and how I think I could build one of those quite easily. It never crossed my mind what you were suggesting, I was back in the eighties at a lab rack in school tooling with an old Tektronix. Your advice will certainly be very helpful I am sure, thank you again for your help.

[bluesdevil]

That's okay, I should have explained what the audio probe was. It actually took a while before I used one... and I kicked myself for putting it off for so long when the thing worked like a charm!