Description
Circuit showing a Burglar Alarm.Here we have used a ldr and a switching transistor for making this circuit
.When the light coming towards the ldr during the period the ldr have low resistance so the buzzer will on.When the light going away the ldr during the period the ldr have high resistance so the transistor will off.Here you need a 12 volt power supply
Components Required
Resistor
10 k(preset)
Transistor
BC 548
LDR
Buzzer
Source by : electronics-circuits
Circuit showing a Burglar Alarm.Here we have used a ldr and a switching transistor for making this circuit
.When the light coming towards the ldr during the period the ldr have low resistance so the buzzer will on.When the light going away the ldr during the period the ldr have high resistance so the transistor will off.Here you need a 12 volt power supply
Components Required
Resistor
10 k(preset)
Transistor
BC 548
LDR
Buzzer
Source by : electronics-circuits
