This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Wednesday, March 16, 2016

Klon Centaur - True Bypass

Here's the Klon again. I wanted one with board mounted pots and for a smaller enclosure. You might be able to fit this in a 1590B with low profile jacks, but it will easily fit in a 125B. It's designed for 9mm PCB mount pots, though it might be difficult to find the dual-gang Gain pot. Look for Alpha part number RD902F-40-00. I've removed a few components that were apart of the stock bypass switching for the sake of space, so you'll want to use your true bypass method of choice with this one.

34 comments:

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    1. Sorry about that. Just uploaded it to the Klon folder.

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    3. Thx man!! this is the best place for DIYs ;) ... one more: 1uf yellow cap... is tantalum cap?

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  2. Hello friend, sorry for the insistence. I have almost finished klon but i don't know what type of capacitor used for yellow capacitor (1uF). I have got one of Tantalum polarized but the scheme doesn´t show the polarity. Can i use a capacitor polyester film box? (non polarized) or i must use the tantalum cap. thanks again!

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    1. Sorry for the slow reply. Tantalum is what's used in the original there. The negative side goes towards the lower end of the board.

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  3. Good day!Not boxed yet,but verified it works and sounds great!

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  4. Woow man!it sounds really great, amazing. Thx!!

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  5. Guys, do you have a bill of material for this thing?

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  6. Any leads on where I might find the RD902F-40-00 potentiometer? My normal sources and a google search didn't really help me.

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    1. I haven't had much luck finding that part either. Small Bear carries a dual gang 9mm pot but it's not the right angle PCB mount. Though you could add some right angle legs with some heavy solid-core wire.

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    2. Yeah, I found a straight leg 9mm and had the same thought so that's prrobably what I will do. Thanks!

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  7. Hi, please I need help, I've done the pedal twice and it works but it has a very exaggerated distortion, it does not sound like an overdrive if not rather like a very brutal distortion, almost like a fuzz

    The plate and compents are fine and not of poor quality.

    Please, may I be doing wrong?

    Thanks in advance and greetings

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  8. Hello! Interestingly resistor assemblies on your 2M(old) and 2.2M, which is it? The standard scheme is not it. Thank you.

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    1. That's just a pull down resistor to prevent footswitch pop. Generally anything from 1-2.2M works.

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  9. Hello,
    was wondering where is the Klon true bypass drill template? Cannot seem to find it.

    Thank you

    John

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    1. Sorry about that. It's in the Dropbox now.

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  10. I guess I can use a MAX1044 instead of the 7660, is that correct?

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  11. Hi.! What's the scheme you used for this one??...

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    1. The Klon schematic on FSB, just modified for true bypass.

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  12. Hi, I built it and it sounds great. But I have a problem with the low range of sounds. On the 6th E string it seems to "punch" (don't know the word in english, something that makes sound dirty) some notes if I play them loud, something like cutting wave. Any ideas? Thank you very much

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  13. I've built a couple of these and all my 1044 chips keep going. it works perfectly for a few weeks then just makes a high pitch with no guitar signal. after I replace the 1044 it works again for another week. does anyone have the correct pin voltages for the max 1044? should I try the 7660?

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  14. I've tried 1044 but sometimes it works and sometimes not or it makes high pitch as with you. With 7660 it works, but I got that problem as I wrote before. Don't know from where it comes from.

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  15. Hi.
    Can I use a 4743 instead of the 4742 zenner? Sorry for my english. Greetings from Argentina.

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    1. You need to use the 12v zenner to protect the charge pump as 12v is the max voltage it can take. The 4743 is a 13v, so no. You'd be better off just not populating that diode, which is ok, just don't power the pedal with anything more than 12v (and really just stick with 9v).

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    2. Thanks for the help. I have troubles with an 7660CP - A whistle sounds with the signal - so I decided to ignore the power section. But thanks anyway :D

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    3. Diego, you need to use at least 7660S (more commonly 7660Scpaz), since it has higher oscillator frequency that human ear can't hear.

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  17. I have other problem: the signal is when I turn the Gain over 13 or 14 o'clock. I partialy solved this problem increasing the value of 1K Resistance after the second opamp - PIN7 of the left IC - to a 47K. Now, with 1N60's, the tremolo have desappeared but continues when the clipping are LEDs. Any idea?

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