Monday, February 8, 2016
Klon Centaur - Bare Bones
This layout is the legendary Klon Centaur, but without the charge pump. The charge pump is present in the original to keep the 2nd opamp from clipping. But since there are diodes before signal even reaches that IC, it may not matter. Check out this thread on FSB for more info and schematic. Without the charge pump, the circuit was much easier to layout for a smaller footprint. Still a fairly large board, but should still fit in a 1590B.
the two 2.2nFs in parallel on the schematic should be a 4.7nF, not a 1nF...
ReplyDeleteyou might want to check the direction of the gain pot(s) as well
Verified. I just finished it. Wester was right in his observations, the gain is backward and the 1nf should be a 4.7. With those alterations done it works perfectly and sounds brilliant. This one certainly will be boxed!
ReplyDeleteIm confused too. "Right" value in is 820p; 1n is aproximation; i guess, we are confused by schematic where are 2x2,2n capacitors are in parallel.
DeleteAha, now i get it. Electrosmash analisys: "The Resistor R20 and the cap C13 form a low pass filter, attenuating frequencies above 495Hz (fc=1/(2xπxR20xC13)) that accentuates a bit more the mid-hump boost."
DeleteIn Klon R20=3922K; C13=820p. In this, "Barebones", R20=68K, so you need to change resistor for ~5 times higher value - C13=4,7n.
Is this one updated?
ReplyDeleteis gain pot and caps updated?
Deleteis backwards
DeleteDid you get into any problems with the missing charge pump / Headroom?
ReplyDeleteWorks ok, but compared to other klon clone (the one with true bypass wiring) this has got much lower amount of gain and overall volume.
ReplyDeleteif somebody want to increase the gain change r22 to a lower value like 50k (47k should work pretty well)
ReplyDeleteCan I use TL082 instead of TL072 for this one??
ReplyDeleteTL082 would work. Just in case, use IC socket, and try :)
Deleteanyone got issues with volume/unity gain on this pedal before i build it? had a few people say on the vero version they have headroom/volume/unity gain issues and that the clean boost isnt as good
ReplyDeleteYes, I built it this week and I solved it using a buffer at output.
DeleteWhat cap do I need to change to add more bass? Toggle switch perhaps would be nice
ReplyDeletecorrections i made: 1n should be 4.7n, gain pot: B3 shoud be B1, A3 should be A1, A1 should be A3, B1 should be B3 . thats all.
ReplyDelete