Sometimes something old is new again. We all love the optical tremolo effect on Fender amplifiers (though it’s not used that frequently), but here’s another way to get the same effect using an old record player and vinyl record.
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The key to the effect is a vinyl record with large tabs cut out of it though. As the record spins, these cut-outs block and unblock the light from a small incandescent bulb. A GL5537 photoresistor is mounted on the tonearm where the cartridge would normally sit. This picks up the different light levels and passes that on to the electronics underneath the deck. It’s important to note that the effect’s sound can be changed by also changing the spacing and size of the vinyl cutouts.
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