We are all makers
From the MAKE Flickr pool: This excellent “bug” synthesizer created by “noise performer” 23N!.
A mini synthesizer (VCO/SLF/Noise) based on the complex sound generator SN76477.
Three capacitors and three resistors are used to vary the sounds.
The resistors can be replaced by a photoresistor (CdS), a phototransistor or a pot.