This is Moosapotamus' take on the Vox Repeat Percussion tremolo. The Skippy keeps the character of the original, but with more control while covering a much wider range of tones. There's also the option to use the modern 2N6027 instead of the vintage 2N2646. And you can plug in an expression pedal to control the speed of the effect. I've changed the tone switch to a pot for more fine tuning. More info here.
Thanks for this one, I am planning to build it caus I didn't come to solve ticking problems with EQD hummingbird, personally I think that the solution lies in the PCB design and how compounents are laid and grounded. I can't find the PCB pdf in the transfert lib, even in Misc folder, would mind uploding it. and millions of thanks in advance
link below the picture, last sentence or go here if you still can find https://www.dropbox.com/s/y9f6zt58yswaiev/Skippy%20Tremolo%20Build%20Doc.pdf?dl=0
thank you, i have already downloded the build doc and believe it or not, it had only 3 pages (pcb transfert missing) but now it has got four pages (hahahaha :D) anyway thanks a lot ;)
V E R I F I E D !! ok then :°) as promised, I ve built it and if you dont wire the expression pedal jack, you need to jumper B and C pads. ... :-) it was ticking like crazy ... but I fixed it by soldering the middle wire of the mode switch in the grounded terminal of R10. after doing that it became dead silent (yessss) the tone pote doesn't make much difference. needs some tweaking or going back to the original design, or leave juste one capacitor.
Built this twice with two different board. Tried both 2N6027 and 2N2646 (not at the same time, of course) and tried different transistors for Q1 and Q2. Only thing I got was a boosted clean signal. Any tips?
lines A, B and C are to turn on the expression pedal?
ReplyDeleteand how to make that connection on the exit Jack for the expression? would have some diagram
Thank You...
Take a look at the schematic and build pics on Moosapotamus' site and I'll bet you can figure it out. ;)
DeleteThanks for this one, I am planning to build it caus I didn't come to solve ticking problems with EQD hummingbird, personally I think that the solution lies in the PCB design and how compounents are laid and grounded.
ReplyDeleteI can't find the PCB pdf in the transfert lib, even in Misc folder, would mind uploding it.
and millions of thanks in advance
link below the picture, last sentence
ReplyDeleteor go here if you still can find https://www.dropbox.com/s/y9f6zt58yswaiev/Skippy%20Tremolo%20Build%20Doc.pdf?dl=0
thank you, i have already downloded the build doc and believe it or not, it had only 3 pages (pcb transfert missing) but now it has got four pages (hahahaha :D) anyway thanks a lot ;)
DeleteI added that 4th page and forgot to comment that I'd fixed it! haha
DeleteV E R I F I E D !!
ReplyDeleteok then :°) as promised, I ve built it and if you dont wire the expression pedal jack, you need to jumper B and C pads.
... :-) it was ticking like crazy ... but I fixed it by soldering the middle wire of the mode switch in the grounded terminal of R10. after doing that it became dead silent (yessss)
the tone pote doesn't make much difference. needs some tweaking or going back to the original design, or leave juste one capacitor.
Thanks for verifying and the build report! Try increasing the value of C1 to 470n or higher to give the Tone pot more range.
Deletedon't forget to tag it as verified !
ReplyDeleteThanks for the reminder! haha
DeleteWhere on Earth do you guys find the unijunction transistor???
ReplyDeleteBuilt this twice with two different board. Tried both 2N6027 and 2N2646 (not at the same time, of course) and tried different transistors for Q1 and Q2. Only thing I got was a boosted clean signal. Any tips?
ReplyDeleteSame isssue here. No tremolo at all. Pots are reversed in the layout 3 should be 1.
DeleteI build this but the signal isnt shunting to ground at all. LFO is working but i cant make it work. Any ideas ?
ReplyDelete