Hi guys, late here in the UK so I'm not thinking straight, standard :)
I'm building a Green Muff from the pedalparts.co.uk PCB/PDF:
http://pedalparts.co.uk/wp-content/uploads/2013/08/BigMuff.pdf
Component Changes:
R19 - 10k
C1 - 330n
C3 - 330n
C4 - 330n
C7 - 330n
C10 - 22n
I think I have some serious issues as here are my transistor readings:
Power in 8.71v
Q1
C 4.44
B 0.72
E 0.13
Q2
C 0
B 0
E 0
Q3
C 7.67
B 0
E 0
Q4
C 4.37
B 1.36
E 0.86
(http://i57.tinypic.com/v6nqpx.jpg)
(http://i57.tinypic.com/2vb4xgw.jpg)
(http://i58.tinypic.com/2wf1p4o.jpg)
Socketed components are currently long-legged...an issue perhaps?
:'(
Where to start? I tried putting a different 2n5088 in place of Q2, still no readings.
I very new to debugging/troubleshooting, so any pointers, starting points etc are very welcome
Thanks
Si
Pictures of both sides of the board would be a good start.
If you are getting no sound an audio probe would be a good start. Follow the audio path with the schematic, starting at the pcb input. Finding where you lose signal can point you to a bad component, solder bridge, etc.
Thanks guys. Pictures added
I don't have an audio probe, will look into making one :)
Thanks
Si
He's currently restocking but this is a great way to get an all inane testing rig ;)
http://www.jmkpcbs.com/JMK_PCBs/Store_files/The%20Testing%20Rig.pdf
Long legs are not an issue. Just make sure they are all set in the sockets and making connection. Are you getting a bypass signal and no effect or neither?
Yes, I've made sure all socketed components are pushed into the sockets and connected. Although I'll go through again and triple-check.
I haven't got a switch setup on my (very) rudimentary test rig, so it's just Ins/Outs to jack sockets.
I'll put another circuit on it to test it's not the 'rig', however it was working on the previous circuit (I know that means nothing ;) )
That test rig PCB looks awesome! Thanks for the headsup!
Si