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Light Dependent Resistor Circuits / Photocell Circuits, Page 4
Light Dependent Circuits:  # - C      D - I      J - M      N- Z

Last Updated on:
Wednesday, July 16, 2014 06:35 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
Night Light -  The two transistors are used as a direct coupled switch, Adam used 2SC711 but any general purpose transistor will do e.g. 2N3904, BC109C. The CDS photocell, type ORP12 is normally illuminated, therefore its resistance is low. The 50k control, the 1k resistor and the photocell form a potential divider which biases the first transistor.  This transistor is on, its collector being held low, turns the last transistor and hence lamp and relay off.....
Octuple Infrared Proximity Detectors Circuit -  The circuits on this page are for an Infrared - Proximity Detector using the Vishay Electronics - TSOP4830 "IR Receiver Modules for Remote Control Systems"…Scroll down to find this one…. [from Rob Paisley's Model Train web site]
Photo Sensor Circuit -  Here's a circuit that takes advantage of the photo-voltaic voltage of an ordinary LED. The LED voltage is buffered by a junction FET transistor and then applied to the inverting input of an op-amp with a gain of about 20.  This produces a change of about 5 volts at the output from darkness to bright light. The 100K potentiometer can be set so that the output is around 7 volts in darkness and falls to about 2 volts in bright light.  (schematic added 05/09)

Photocell Activated Toys -  Sensor circuitry out of a very sensitive children's photoelectric Room Gaurd toy. The original toy would talk and make alarm sounds, whenever an intruder walked by or cast any kind of shadow onto the photocell.  This circuit has immunity to battery voltage transients..... [Reverse engineered schematic by Stepan Novotill]
Porch Light Switch -  This circuit will activate a relay when light falls to a preset level. Light level can be adjusted with VR1 and the relay contacts may be used to operate an external light or buzzer.…. [Andy Collison]
Quadruple Infrared Proximity Detectors Circuit -  The circuits on this page are for an Infrared - Proximity Detector using the Vishay Electronics - TSOP4830 "IR Receiver Modules for Remote Control Systems"…Scroll down to find this one…. [from Rob Paisley's Model Train web site]
RF Transmitter Light Sensing -  Photo sensor is placed in series with a resistor…. [Tony van Roon's circuit]
Screamer Siren - Light Controlled -  This circuit will produce an ear-piercing scream, depending on the amount of light being detected by the Light Dependent Resistor.
Sensing Light with a Programmable Gain Amplifier -  Microchip Application Note Published 28-Mar-03  (app note added 2/06)
Simple light Sensoradapter for Oscilloscope -  (electronic circuit added 4/05)
Simple Photodetector Circuit -  I´ve designed this simple circuit to test a photodetector. I got the detector from an old 5 1/4" disk drive. If you can get one, you will find two photodetectorts: one is used to sense the density (double density or high density)(schematice added 6/07) 
Sun - Up Alarm -  The Sun - Up Alarm can be used to provide a audible alarm for when the sun comes up or it can be used in a dark area and detect when a light comes on. It can also be used to detect a light beam, headlights etc. The circuit works as follows. The phototransistor is very sensitive to light. (Any phototransistor will work fine)....
Sunrise Lamp using 120VAC 60 Watt Lamp -  In this circuit, a 120VAC lamp is slowly illuminated over a approximate 20 minute period. The bridge rectifier supplies 120 DC to the MOSFET and 60 watt lamp. A 6.2K, 5 watt resistor and zener diode is used to drop the voltage to 12 volts DC for the circuit power. The bridge rectifier should be rated at 200 volts and..... [Bill Bowden's circuit]

 
Light Dependent Circuits:  # - C      D - I      J - M      N- Z

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