The HT- 2811 is a CMOS LSI chip specially designed for the application ofDing— Dong door bell. It requir very low nombers of external component andprovide low cost, high quality dual tone Ding- Dong sound. The IC is verysuitable for door bell application.B. Features —* CMOS Metal Gate process.* Operating voltage : Z4V~3.3V.* Low stand-by current : la A typically at VDD=3V.' Good sound quality, (dual tone)* envelop adjustable by external RC
HT-2811 Ding— Dong door bell.
