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TRS drawbot (RC servo based)


controlling servo's direct from a headphone output (NO arduino needed!)



Two servos and a headphone jack are all there really is to TRS Drawbot's electronics. Robots don't get much simpler than this.
The lower rail is grounded through the power jack case contact and provides a common ground connection for the TRS jack and servos.  The upper rail is held at Vcc through the power jack center pin jumper wire, and carries drive current to both servos.
amazing grace TRS Drawbot