Hello there,
I've built a DBA Robot (following johnk's layout:
http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/DBA/01-DBA_ROBOT_VERO.png ).
It works OK for a while (1 hour... 3 hours...) then stops... I have to unplug it for a while for it to start working again. I have swapped ICs without much success.
What bothers me is that I don't think I understand the schematic/layout or transition from schematic to layout. schematic, from FSB, here:
http://www.freestompboxes.org/download/file.php?id=16560&mode=view If I follow johnk's layout and the schematic, DC connector's "-" lug is not grounded, but Mark and Alex have proposed a layout where it is (if I get it right). I can't believe it does not make a difference... Plus I've seen notes that the original Robot cannot be daisy chained with other pedals regarding power supply, which leads me to think I should not ground it.
Fact is I have weird voltages on the ICs, so I'm trying to figure out what is happening... anyone has voltages from a working unit?
Thanks in advance!
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