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 just dual op-amps, so choose a favourite and run with it. The Lightspeed uses an expensive high-performance op amp, and the Southland uses a standard TL072.
Schematics for both can be found over at PedalPCB, if you want to check out the similarities yourself.
It’s a little cramped now, but you can always add a row on the right-hand side to free up some space.
LIGHTSPEED X SOUTHLAND OVERDRIVE SWITCH MOD
NOTE: I’ve not tested this on the breadboard or LTspice, so I can’t tell you if there are significant output level differences between the switch settings – I don’t know if it would be a good idea to have the switch as a foot switch. It might be awesome; I just don’t know…