This post explains for the semiconductor HT2811.
The Part Number is HT2811.
The function of this semiconductor is Ding Dong Door Bell.
Manufacturers : Holtek
Preview images :
The HT2811 is a CMOS LSI chip specially designed for the application of ding-dong door bell. It requir very low nombers of external component and provide low cost, high quality dual tone ding-dong sound. The IC is very suitable for door bell application […]