Help! Adding an onboard distortion preamp to a bass

Discussion in 'Pickups & Electronics [BG]' started by Kevinchriste, Apr 15, 2014.


  1. Kevinchriste

    Kevinchriste

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    Hi, im in the process of designing the schematic for a bass im going to be refurbishing and i would like to add several things including an onboard distortion/overdrive preamp. Yes I know its way easier to just buy an fx box for this but i think it would be fun an unique to put it onboard instead. Anyone have any tips or schematics they can direct me too? I am an aviation electrician in the navy so i have some knowledge and experience in wiring and schematics. I think this would be a fun project and any help would be greatly appreciated thanks!

    Kevin
     
  2. lx_night

    lx_night Supporting Member

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    Very cool idea! Looking forward to the outcome!
     
  3. Kevinchriste

    Kevinchriste

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    Thankyou! I found this websight and it give some good insight into how distortion works in a non-tube situation my, but im still looking if i have to ill just trial and error my way to get it to work right but id rather not. And that is one of my concerns and its prolly a dumb concern but to get an effective overdrive in low frequencys what would be needed to change....i mean im sure its not much but its still a concern.

    http://www.generalguitargadgets.com/richardo/distortion/
     
  4. lokikallas

    lokikallas Supporting Member

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  6. line6man

    line6man

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    Kevinchriste likes this.
  7. Crater

    Crater

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    There are several 1-transistor overdrives that sound good and lend themselves to "on board" installation. Just do a google image search for these schematics:
    1) Bazz Fuss (yes that's spelled correctly)
    2) Cream Pie germanium booster (there's two versions)
    3) Electra Distortion

    You'll find the circuits are somewhat similar to each other. You can always experiment with the input and output caps, if you think there's not enough bass. Larger value caps pass bass more easily, so for example on the Electra Distortion you could change the output coupling cap, C2 from the stock value of 0.1mfd to a 0.22mfd or even 0.47mfd and see how it affects the sound. Also, you can experiment with different clipping diodes: silicon, germanium, LEDs, ect...
     
  8. Kevinchriste

    Kevinchriste

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    Thankyou crater so much good information i will definately look into all of that!
     
  9. drewfx

    drewfx

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    You might find this uesful:

    gmarts !!!!! org !!!! / !!!! index.php?go=217!!!!

    Arrg, can't post links with the new forum SW!


    EDIT: They fixed the link posting. :hyper:

    http://www.gmarts.org/index.php?go=217
     
    Last edited: Apr 16, 2014

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