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.

Monday, January 12, 2015

Ripthorn FET-2B Bass Preamp

DIYStompboxes forum member Ripthorn adapted the Alembic F-2B tube preamp to a JFET preamp. It gives you 3-band EQ controls, master volume, and a bright switch. Fairly simple circuit, but might turn into a bit of a rats nest with the offboard wiring (I know, a bit out of character for me). Set the trimmers to about 4.5-5v and then adjust from there to taste.


  1. I've built your layout. I've only scaled down the tone stack for less noise. It works well, it sounds pretty good. The only drawback is this hiss/crackle that is always present.

  2. I just built this too! I have no crackle, on the contrary, it's one of the cleanest pedals I've built. I ended up having different values for the "treble caps", which is probably why the pot doesn't have much effect when I turn it.
    Sounds killer!

  3. A B500k pot is a good reemplacement for volume pot? Thanks!

  4. I did not understand the connection of the pots... help :)