Electrical World

The electronic doorbell in this article is the most simplest among the advance projects in this website. There are many other benefits of the project doorbell. The circuit for the electronic doorbell here will help realise whether the visitor is in front door or in back door. More about there is two LED indicatorwith different colours which provide visual indication to check if anyone had come nor not in your absence. PART LIST Transistors T1,T2,T5 BC148B T3,T4 BC158B T6 AC128 Diodes D1,D2,D3,D4 1N4001 D5 GREEN LED D6 RED LED Capacitors C1,C2,C3 0.01 μF Resistors R1,R7,R8.R9,R10 2.2 KΩ R2 47Ω R3,R4 100KΩ R5,R6 10KΩ R11,R12 330Ω Miscellaneous S1 ON/OFF toggle switch for memory S2,S3 Switch for doorbell BATT 9-Volt Battery LS Loud Speaker 8Ω OTHERS  PCB , Connecting Wires, Hardware,enclosure etc Circuit Description Working Principal The presented ci...