This simple circuit produces sound effects given by the 4093 oscillators and switches LEDs alternately. The circuit can be powered by voltages from 5 to 12 V and the transducer is a ceramic capsule of high impedance.

This simple circuit produces sound effects given by the 4093 oscillators and switches LEDs alternately. The circuit can be powered by voltages from 5 to 12 V and the transducer is a ceramic capsule of high impedance.