Klon Centaur

Here’s a layout I did for the Klon Centaur overdrive based on a schematic by soulsonic.

Update (28.02.2011): I finally got around to boxing the Centaur. This time I felt brave and decided to try an artwork technique courtesy of “frequencycentral” over at freestompboxes.org (described in this thread). I thought I gave it a good go being the first time and all, but needless to say from looking at the picture my only option was to leave it to dry outside in -20 degrees Celsius (that’s -4F for you Americans) and the result was less than optimal. Looking forward to spring and my next attempt.

Update (18.03.2012): I’ve had several requests for voltage readings from my build and here goes:

Battery at approx. +8.90v and all pots at zero.

1  +4.43V  +4.6V  +8.84V
2  +4.44V  +4.43V  +4.52V
3  +3.45V  +4.43V  0V
4  0V  -8.44V  -4.13V
5  +4.43V  +4.42V  -8.42V
6  +4.43V  +4.43V  +3.97V
7  +4.41V  +4.26V  +5.29V
8  +8.87V  +15.92V  +8.82V

I don’t know whether these are the “correct” voltages, but mine sounds good so…

Update (21.06.2012): Fixed an error on the layout where gain lugs #1 and #3 were swapped. Thanks to Dieter Brenner for pointing this out!

Updated: 12 April, 2013 — 15:31


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  1. Hi Harald
    If I use a 3pdt stomp switch do I ignore the middle row (4,5,6) or the row to the right (7,8,9)?

  2. R5/R10, both 27k, should set the bias voltage (approx. half your supply voltage) that’s going to be used a lot of places, including IC1 pin #3. R9 is responsible for raising pin #3 DC voltage to this bias voltage.
    You should read roughly +4.5V DC at strip “b”, left side (where “Gain 3″ also connects). If it’s not you might have a related component shorted or something similar; solve that.

  3. Any possible way to get a good diagram/picture from any of the successful builds? I’m having trouble with wiring the board to the hardware,gain pot, board to switch etc. Any help would be greatly appreciated. I have gone thru the board meticulously. It’s exactly as the diagram. Just need help wiring it up. Thanks!

  4. Can somebody point out what are the components that could affect IC1 pin3 voltage? It´s kind of frustrating to randomly swap components in hope to find the suspect. Every component is in the right place, all resistors are measured, cap values checked visually and different IC´s tested.

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