M602-Ding-Dong-Generator-IC-Tru Semi-M602-P-This-simple-ding-dong-generator-IC-is-suitable-for-door-bells-musical-instruments-toys-etc-&-requires-only-the-minimum-number-of-external-components-to-produce-a-working-circuit-The-circuit-requires-a-3V-battery-power-supply-to-work-&-has-an-operating-current-of-only-0-1m A-P-Tru Semi-M602-Ding-dong-IC