Build a Simple Run-Down Clock Circuit Diagram

A sound generator is a vibrating object which produces a sound. How to Build a Simple Run-Down Clock Circuit Diagram? This is a simple sound generator circuit diagram this is a simple and easy to use. Enter your desired frequency and press play. In this circuit used in electronic roulette or dice games, this circuit produces a clock signal that initially is several tens of kHz (depending on C2) and gradually decreases to zero in about 15 seconds, as CI discharges through R4. 

Simple Run-Down Clock Circuit Diagram