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.

Tuesday, June 2, 2015

Vemuram Jan Ray

Got a request for this one. It's another Timmy knockoff with a couple extra low value caps and a weird resistor array leading to the Bass control.


  1. Help explain how to connect the power cord to the foot switch.

    1. Here's a good diagram for offboard wiring.

      You don't connect power to the footswitch.

    2. oohhh....Thank you very much It does not require connect a power cord from a foot switch connected to the circuit.

  2. Hi,the 1,5k resistor between Vref and Ground is unnecessarily.Parallel with 8,2k pull down Vref to 0,9v.I remove this resistor/dont see it on any Timmy Jan Ray schematic/and everything works fine.

  3. Hi!
    Your layout is verified now but 2 minors things to change:
    - replace the 1.5k resistor by a 7.5k to reach 4 Volt for Vref
    - swap gain 3 and 1

    I have used RC4558P for IC and it works very well.
    Thank a lot

  4. Replaced 1.5K resistor to 7.5K all earned, with 4 diodes strange work, left 2. And yes the gain 321