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DIY BOSS PS-3 Expression/square wave LFO Pedal


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Just finished this after finding the half finished project in my pile

I built it from mostly salvaged parts the pedal was originally for a technics organ I found



it has two modes one is just a simple expression pedal and the other is a square wave LFO whose speed is controlled by the treadle position


there is also a rate LED on the back to show speed


the circuit is a very simple 555 timer and home rolled LDR combo


it allows for some really whacky vibrato like effects when used with the PS-3 :idea:

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