Bernarddur, the schematic and tracing wizard over at FSB got hands on a FM-2 a while ago. It turns out that the circuit went through some revisions during its short lifespan. The Fuzz Adjust (Tone) control had been reowrked and the recovery stage had been altered. Since it is one of my favorite vintage circuits I decided it needed another layout!😏
Schematic is avaiable HERE.
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ReplyDeleteThanks Markie!
DeleteI just finished this and it’s a really fun, relatively quick build, partly because it uses a lot of common resistors! I haven’t had a chance to play it too much, but it’s got a unique sound. I used 2n5088 Q5 and BC548 for Q1-4, but I may experiment with some others. Thank you Anders!
ReplyDeleteAnders, I discovered an error. I wasn’t getting the octave, so I looked through the schematic, the 100k D12-M12 should be E12-M12, otherwise the base of the transistor is grounded, Glorious octave fuzz now!
ReplyDeleteAlso I would suggest lowering pot values, since most of the action is bunched up using 100k. I used 10k for both.
DeleteThanks for the catch. Fixed.
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