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, August 19, 2015

Gas Pedals DumbBell

Got a request for this one. It's an overdrive that's supposed to get you into Dumble sound territory. There are 2 versions of this pedal out there, a one knob version (with just a volume control), and a 3-knob version that the layout below follows.




14 comments:

  1. Is there a more readable schematic? It's a bit messy to back track the schematic with the board design.

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  2. if I want to use 3pdt switch for boost switch, do I just need to follow the pin out in General Layout Notes? how to wire the led for boost switch?

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    1. I believe those SWs are the input and output for the boost section. If so, which one is the input and output?

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    2. I'm pretty sure that sw3/6 is the input of the boost section, and sw2 is the output. What's the function of sw5?

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  3. Level and tone work, but it doesn't produce any drive, only clean sound. I've double checked the wire and change the ic 3 times still doesnt work well. Any idea?

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    1. I just ran into a similar problem with an Acapulco Gold clone. So far I have not come up with a solution.

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    2. Funny, I got no problem when making that one haha. Anyway, can I see the schematic for this one?

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  4. I did a little research through the internet and found that 22nF should be 220nF. Still got no time to replace mine. I'll be back with report later

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  5. hi everybody
    another great layout! mine worked at the first time, i substituted the 7.15k resistor with 7,5k, but i also have very less overdrive! ( and maby too less low-end!). i,m going to change the 22n cab to a 220n, hope that helps.
    greetings from austria!

    bluesanderl

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  6. yessss! i,ve hanged the 22n cab to a 220n and now it sounds like it should!
    light overdrive, and with the boost activated ...... YESSSS!!!

    i think you can mark it as verified

    thanks from austria
    bluesanderl

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  7. hi everybody
    just one question: then tone pot has less effect! i substituded the 7,15 k resistor with a 7,5k , could this be the fault of my tone control?
    (sorry for my awful english, normally i speak german, hi hi )
    i will try to change it to a 6,8k, maby it would fix the problem.
    ( im not willing to stack resistors to get exat 7,15k)
    maby somene else has the same problem, please let me know!!
    thanks
    PS: the sound of the pedal with or without a effective tone control, is great!!

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