Overdrive

GREER AMPS: Lightspeed X Southland Overdrive, Switch Mod

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GREER AMPS Southland X Lightspeed vero layout v1a dcd60cc8dc37

So given the Lightspeed and Southland are basically the same circuit, I thought I might add a switch to swap between the two. The switch does three things; Switches the hard clipping diodes in/out Changes op-amp gain (to account for the hard clipping diodes) Changes Drive pot resistance While they use different op-amps, they’re both … Read more

GREER AMPS: Tomahawk Deluxe Drive

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GREER AMPS Tomahawk vero layout v1 b776b67c4b3e

This is a simple one from Greer Amps – the Tomahawk Deluxe Drive.  It has some distinct similarities to a Rat or Distortion +, in that there’s opamp clipping, driving hard clipping diodes, and a tone control.  Schematic from PedalPCB.   I added a buffer on vref, as half the opamp wasn’t being used, so why not. GREER … Read more

Death by Audio Interstellar Overdriver Deluxe

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Death by Audio Interstellar Overdriver Deluxe 6b59d2978a16

 Thanks to Ross to reminding me about this one! Here we a have a circuit for people that just love offboard wiring. 😉 Also be prepared to use sockets to try out different transistors since this is a “reverse beta” design which can be quite finnicky and be a source of frustration. Scheematic is avaiable … Read more

Interfax HP-1 Harmonic Percolator – Early silicon version

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Interfax Harmonic Percolator dual NPN Si df9414a0ba6f

 The earliest version of the infamous HP was actually a dual silicon transistor circuit. It also had a few addons and a few big cap fifferncies compared to the later Ge/Si version. Not sure how it sounds but I guess some of might be interested to to try this one out. The 2N3565 transistors had … Read more