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This design has since evolved into the Drone Jar.

Built inside a reused jar, this drone synthesizer consists of dual square-wave oscillators modulating against each other. The pitch of each is controlled by outside light sources hitting the two light sensors inside, so there is a lot of room for experimenting. All of the components are built in a three-dimensional floating circuit that comes down from the lid of the jar.

There is a single switch on top for power and a red LED indicator.

Audio Out: 1/4″ mono
Power: 9V Battery

This was hand-built in a numbered series of six.