The Teenage Mutant Ninja Cookie Monster was my first circuit-bent toy. It features the speech chip out of a Cookie Monster toy with the timing resistor replaced by a pot, allowing for variable pitch output. The toy’s momentary button is hooked up to both an external button and an oscillator, with a pot to control oscillation speed.

The oscillator mode allows for stuttered output and, in combination with the pitch control, produces a curiously interesting array of sounds.