Electro Harmonix Small Stone V3
There was a an incorrect value in the factory schematic. It is now corrected and the layout is verified by slammer88.
Electro Harmonix
Electro Harmonix Pulsar
A modified layout for the old EHX Pulsar which is infamous for its LFO ticking bleedtrough. There is two mods that hopefully can solve it. First, an op amp input buffer and second the more common mod; separating the power with a small value resistor between the amplifier and the LFO section. LFO section also … Read more
Electro Harmonix Small Stone V1
Layout for the first version of Small Stone which was produced between 1974(?) and 1978. Layout is based on schematic from Lectric Fx Note that original had long gone obsolete 8 pin OTA chips so this layout is modernized for easy to get LM13700s.
Electro Harmonix Hot Tubes
And a modified layout for more gain on tap for high gain fuzz sounds. 75k feedback resistor right to IC1 is changed to a 250k pot and 1000nF cap is connected straight into 8,2k resistor which is connected to the first hex inverter.
