Optical schmitt trigger

Posted on Sep 2, 2012

This circuit shows a 555 with its trigger and threshold inputs connected together used to energize a relay when the light level on a photoconductive cell falls below a preset value

Optical schmitt trigger
Click here to download the full size of the above Circuit.

Circuit can be used in other applications where a high input impedance and low output impedance are required with the minimum component count.

Leave Comment

characters left:

New Circuits



Popular Circuits

Morse Code Beacon Keyer
Micropower Voltage Regulator Schematic Diagram
Numerical control UPS uninterrupted power system technological principle and typical application
High Voltage Converter: 90V From 1.5V
H bridge motor driver circuit
MFOS Mini-Controller circuit
high-level accessory front end for the HF amateur bands
The 203 Theremin
Switch control circuit diagram mcu
Combustible gas alarm circuit