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, June 29, 2015

Run Off Groove May Queen

Here's another "Brian May in a box" circuits, this time from Run Off Groove. The May Queen is a treble booster/overdrive that should get you pretty close to those classic Queen tones. The cap between 9v and the drain of Q3 in the layout below is optional. It's a high end filter, so the larger the values will cut more treble frequencies (2.2n is just a good starting point–adjust to taste). I've added polarity protection, power filtering, and a pull down resistor at the input. You might be able to cram it into a 1590a. For the schematic, transistor voltages, and sound samples, check out


  1. I built one of these a while ago using the ROF perfboard layout. They are bloody brutal. Great solo hi-gain Vox sorta tone. Difficult to get to do anything else though! Fun build :)

  2. hey dude, this sound awesome but i have a question... exactly what function does the trimmer? and if i use a potentiometer instead of it, can i have more control of the effect? like a tone or gain control?

    1. The trimmer biases the JFET. It won't be very useful as an external control.

  3. How can I add a gain control ?