hobby electronic circuits

This simple continuity tester circuit constructed with single npn switching transistor SL100, this circuit will give…

USB desktop lamp circuit

This simple desktop lamp circuit gives enough light during night time work without disturbing others. Here…

This configurable alarm produces different types of tones. It can be selected by switches, this circuit…

This is single IC LM3909 variable LED flasher circuit, and it needs only 1.5 volts for operation,…

To detect movement or motion of person the simple PIR (Passive InfraRed) circuit can be used,…