3 in one doorbell

The circuit comprises the power supply which is formed by TR1, Q3, D13, Q1, D9 This supplies both the 12 volt rails and the five volt rails for the micro which i..
3 in one doorbell - schematic

Recommended videos

  • 3 Transistor Homemade Musical Door Bell Electonics Lab Project: Easy Circuit!
    Duration: 1:03.
  • Simple doorbell circuit using 555 timer
    Duration: 1:28.
  • DIY Door Bell by using 555 Timer
    Duration: 5:16.