The following schematic shows a Ding Dong Door Bell Circuit Design using 8021-2 IC. The 8021-2 IC is an 8-pin DIP having an in-built circuitry to produce dingdong sound each time its pin 3 is pulled low. The Ding Dong Door Bell Circuit Design consists of: On-Off Switch, 3Volt Battery, push to on switch, speaker, transistors and resistor.
Employ a limiting resistor(1kΩ)between collector of T1 and base of T2, otherwise they will blow up in short time. Also the battery will be drained out in no time.
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