PCB question

[Tony Allgood]

>Do any of you know the difference between the at least four different
versions of the TB-303's circuit board?

Hi Justin,

I didn't realise there were several versions out there, but it doesn't
suprise me. Some of the PCBs that Soundcraft released went to seven
versions. Too many time constraints in the design phase, I fear. It is
unlikely that there are any major changes; some may be due to a
particular component source drying up, others design 'improvements'.

In any fault condition you need to find out what is actually not
happening? Does the TB303 make a sound at all? If no sound, where does
it stop? At the VCO, at the VCF or is it the u-proc board at fault. Are
there ANY signs of life? You may even find that once you have repaired
the PCB, the fault still occurs because a part has been damaged due to
the wrong voltage that has been applied somewhere. Why not go to your
local repair tech and see what he can do? We don't all charge the earth!

Regards,

Tony Allgood  Penrith, Cumbria, UK

MidiDAC Superior midi-cv, SuperLadder, TB303 clone and Filter Rack

http://www.techrepairs.freeserve.co.uk/projects.htm