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, March 27, 2018

Fender Eric Clapton Active Mid-Boost

Got a request for this one. It's the active midrange boost (of up to 25dB at around 500Hz) found in Fender's Eric Clapton signature Stratocaster. Ended up not board mounting the pots for a smaller board for those building this into a guitar. Here's the schematic for reference.


  1. great!!!
    i,m looking for this about a couple of month! ther is an existlng layout on tagboard fx, but i like to build it on a pcb.
    one question: is this one designed for standalone operation? i mean : do i need the tbx tonecontrol to get it really working?
    however, i will build this as soon as possible,
    many thanks for your great work!!
    can you send me your paypal acount, so that i can send you a little gift for your excelent work?
    ( my e-mail adress is )

    1. you can donate over the down left corner of the blog. can even donate wth paypal

  2. Thank you! What the MID control does? Is the Mid frequency is variable? or it works like a gain for the ~500hz?

  3. build it, and it works.
    but the mid pot is reversed ( had to exchange lug1 and 3) and transistor 1-3 ( i used 2n5089 because i had them in stock) are also reversed ( maby only the picture, didn,t compare it with the schematic or my trannys have a diffferent pinout) i rotated them 180 degrees and now: here we go!!!

    nice tiny layout, works great

  4. nice layout once again
    and for all those who cant etch or something
    I have found a guy that already has a pcb version of this boost with the tbx pot as well
    you can check it out here

  5. Hi everybody!
    I got a Used tbx tone control dual pot, and i would like to add it to the mid boost circuit.
    I have no really idea where and how to Place it. Should it be located just before the circuit?
    The board himself works perfect!
    If anybody has an idea, please let me know!
    If it.s finished it should work like the "claptone" fx Pedal. ( mabey i put an ep booster Art the end?)
    Greetings from Austria

  6. Just a Little Note!
    If it is Used as an extern fx pedal, it,s necessary to use a 50k log pot for the Volume!!!
    After that it Works Perfect! The tbx Control is simple Placed in front of the Circuit!

    Happy New year to everybody!

  7. Amazing Sounds ,Cheer!