Author Topic: Half Pint Overdrive (Runoffgroove with mods)  (Read 1917 times)

Aleph Null

  • Electron Doctor
  • *****
  • Posts: 504
    • View Profile
    • The Hard Problem
Half Pint Overdrive (Runoffgroove with mods)
« on: September 10, 2021, 04:52:29 PM »
This is my take on the Runoffgroove "Grace" overdrive.



The JFET input buffer of the original is replaced here with a BJT buffer for an input impedance of around 1M ohm (depending on the transistors gain). Bias voltage is taken from pin 7 of the LM386 which saves a couple resistors and a little bit of space. A tilt EQ sits at the end. Unlike a BMP, this offers a mid bump. The switch bypasses the tonestack.



This has the characteristic crackly decay of every other LM386 overdrive I've heard. I wouldn't want to use this into a clean amp, but it does sound very good pushing a dirty amp or another overdrive. You get that percussive attack and the mid boost in the tone control keeps everything tight.


« Last Edit: September 12, 2021, 02:10:27 PM by Aleph Null »

harryklippton

  • Solder Ninja
  • ****
  • Posts: 377
  • Will
    • View Profile
Re: Half Pint Overdrive (Runoffgroove with mods)
« Reply #1 on: September 11, 2021, 02:32:54 PM »
That looks really sleek!

Aleph Null

  • Electron Doctor
  • *****
  • Posts: 504
    • View Profile
    • The Hard Problem
Re: Half Pint Overdrive (Runoffgroove with mods)
« Reply #2 on: September 14, 2021, 09:42:34 AM »
That looks really sleek!

Thanks! I had originally planned to do a graphic, but I found I liked the look of the raw aluminum.

harryklippton

  • Solder Ninja
  • ****
  • Posts: 377
  • Will
    • View Profile
Re: Half Pint Overdrive (Runoffgroove with mods)
« Reply #3 on: September 14, 2021, 02:13:33 PM »
Yeah it's a good look and the grey knobs complement it nicely