Great fuzz sound! I use silicon PNP transistors with Hfe values for Q1:95, Q2:97, Q3:133, and Q4:154. These are the best I've chosen from what I have now. The sound is great now, but I think it would be even better if I used lower Hfe germanium PNP transistors.
No, it doesn’t sound any different from an npn muff. EHX made em twice, V1/triangle(FS37000) & V2/ramshead(2n5087). If you’ve been to the Kit Rae big muff site then you know about pnp muffs, so I’m sure he knows about them already, but don’t hold your breath cuz it’s probably on its way 🤭
EHX made a run of BMP’s with FS3700 pnp’s in 1972? Beware the SA1015 has a BCE layout?
ReplyDeleteAlso, it’s Kurofune, not Kurofone?
ReplyDeleteGreat fuzz sound!
ReplyDeleteI use silicon PNP transistors with Hfe values for Q1:95, Q2:97, Q3:133, and Q4:154. These are the best I've chosen from what I have now.
The sound is great now, but I think it would be even better if I used lower Hfe germanium PNP transistors.
I'm sure this layout can be tagged.
DeleteThe range of the SA1015 is 200-400 hfe?
DeleteSorry that I don't know. I selected TRs with low Hfe from the 2907As and MPSA92s I have.
DeleteIt's a Big Muff
ReplyDeleteDoes the pnp do anything significant for the sound or is just more big muff?
ReplyDeleteAnd how long before Josh discovers it and releases a big box version?
No, it doesn’t sound any different from an npn muff. EHX made em twice, V1/triangle(FS37000) & V2/ramshead(2n5087). If you’ve been to the Kit Rae big muff site then you know about pnp muffs, so I’m sure he knows about them already, but don’t hold your breath cuz it’s probably on its way 🤭
ReplyDeleteIs this one running -9v perchance?
ReplyDeleteNo, it uses 9v DC and the circuit flips the polarity so a voltage inverter isn't necessary. I'm not sure why they made that choice but it's cool.
DeleteCould you do a layout for this booster? https://docs.pedalpcb.com/project/Fumble-PedalPCB.pdf
ReplyDelete