This one started as an attempt to improve an obscure old japanese germanium fuzz circuit from the late 60s called Sekova FA II Fuzz which suffered from quite low output and lack of sustain. After some experimenting I removed the clipping diodes, tweaked the bias and added another gain stage upfront which is borrowed from Roland Bee Baa but with a germanium transistor. For transistor selection I found that these with low leakage and a hfe around 100 sounds good but it is worth experimenting with others especially for Q2 and Q3.
How do we make requests for layouts? Ive got two schematics I'm dying to build.
ReplyDeleteWhich circuits do you have in mind?
DeleteThe Tone God Bullitt Tremolo https://www.thetonegod.com/diy/bullitt
DeleteRick Holts Bipolar Disorder Tremolo https://www.tdpri.com/threads/fender-style-tube-tremolo-in-a-pedal.165297/
Good work, i will try it with npn mp38a!Thanks!
ReplyDeleteLooks very cool! Definitely gonna slice a piece of vero for this one.
ReplyDeleteBtw.. did you see this? https://www.freestompboxes.org/viewtopic.php?f=7&t=31098
Yes I did! Too bad there is too many missing values in the op amp part...but I'm very tempted to build the transistor section...
DeleteBeast Fuzz! Used npn mp 38a. A lots of gain! So i made little dirty mod with 4148 diodes like muff
ReplyDeletehttps://imgur.com/a/NIkmaWq
germanium diodes works too, not so much gain but more dirty harmonics!
ReplyDeleteWoow, I built this and I love it! I can see how this little beast resembles a Bee Baa, but it definitely has its own mojo, and a very tasteful tone control. Cheers Anders!
ReplyDeleteThanks Sergio! Glad you like it.
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