SDD-3000 Preamp: First Prototype

Posted: 2009/08/31 in DIY Guitar Effect Pedal Projects, SDD-3000 Preamp Clone

The first step was to build a working prototype based off of the schematic using a solderless breadboard.  This allowed me to test out some different components, LED resistor values and so forth.  In the pic below you can see the prototype with some scrap sheet metal to hold jacks and knobs.  (I found that if I don’t do this the patch cords can pull wires out and things get too messy.)

SDD3000 Preamp Prototype

SDD3000 Preamp Prototype

You can see that I used rotary switches for the attenuators instead of slide switches like on the original.  I think rotary switches are more convenient on a pedal, but the drawback is they eat up a lot of circuit board space.   The large breadboard was just for testing the relay switching and some different LEDs… actual preamp itself is quite small.

Closeup of the preamp section

Closeup of the preamp section

Up next…circuit boards!

  1. sbm says:

    Hi Trabant,

    nice build! How do you decide between using film resisters versus the usual 5% tolerance?

    • trabantland says:

      Thanks sbm-

      Well generally metal film resistors are considered to be less noisy than carbon films, etc., so I went with the metal films. As for the values, I used the ones published in the schematic (from the service manual) and they worked and sounded just fine.

  2. Declan says:

    Where can I get one of these!!!

    • trabantland says:

      Hi Declan (and anyone else also interested..), The first run was sold out, but contact me through the “About/Contact” link here and we can see about getting you one from the next batch.


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