Light Detector


Posted on Sep 27, 2012

The circuit`s threshold is set by resistor R2. When the intensity of the light falling on the LDR is lowered, resistance of


Light Detector
Click here to download the full size of the above Circuit.

that unit increases, and lowers the voltage applied to the inverting input of the 741. The reference voltage at the noninverting input of the 741 is set (via R2) so that the comparator switches from low to high when the light falling on the LDR is reduced. That high activates transistor Ql, which causes the relay contacts to close.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Accelerometer Schematic
Audio frequency generator
Precision thermocouple signal amplifier
micprocessor
Motor Controller
POWER FREQUENCY CONVERSION CONSIDERATIONS
Thyristor drive circuit
BA532 Amplifier circuit diagram
Lamp touch switch circuit diagram



Top