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, October 8, 2019

Apocalypse Audio Four Horsemen

Stumbled across this circuit a little while back and thought it would be a nice change from most of the opamp-based overdrives out there. Should fit nicely in a 1590B.


  1. That's great!! More circuits transistorized, please...
    We need more circuits with transistors(without most opamp-based circuits out there).


  2. mark it verified, David! Such crunchy over, not high gain.That sound like hybryd fuzz with low gain. Nice working with booster or another over before it. Q2 used 2n3904, but better some with hfe more 500, i used bc 549c!Q3 -2n7000, Q4 pnp Ge tried hfe 60 & 100 - indifferent.

  3. Hello good I am new to this and I find it hard to know the measures of the pcb board, could. Tell me the measures of the pcb board ?

    1. Dimensions for all the boards are in the transfer image pdf. Go up to the Transfer Image Library tab at the top of the page (switch to desktop view if you're on mobile) and you'll find scaled pdfs for everything on the blog.