This module provides four VCO's on two PCB's (so it's actually two dual LFO's). The oscillator itself is modified version of the Terry Mikuluc / ASM-1 sawtooth VCO. I skimped on the exponential generators because my intention was that the frequency would just be adjusted with pots and they wouldn't have to track. I wish I hadn't now - the range on these VCO's is incredible; I can get from .01hz to 30khz out of them.
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LFO schematic
Master frequency and mixer schematic
(only one of the mixers is populated)
Dual LFO Bill of Materials
(You willl need to double the parts if you want to build a quad)