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Light Dependent Resistor Circuits / Photocell Circuits
Light Dependent Circuits:  # - C      D - H      I- N      O- Z

 

Last Updated: August 22, 2015 03:33 PM


Circuits Designed by Dave Johnson, P.E. :
  • Cascode Light Receiver Circuit -  This page provides a detailed explanation of how the modified cascode light receiver circuit operates. The cascode technique in conjunction with an inductive load provides very high current to voltage conversion as well as very high speed . . . [Circuit by David Johnson P.E.,  02/15/02]

  • Cell Phone Solar Powered Charger -  The simple circuit below regulates the voltage from a 6v solar panel to a fixed +5v. That voltage can be fed to any cell phone or USB connected portable device, to charge its battery. The circuit uses a Reg113-5 voltage regulator from Texas Instruments . . . [Hobby Circuit designed by Dave Johnson P.E.,  01/02/11]

  • Circuit Indicates Time to Dust -  I have used the circuit below for many different applications, which require ultra low power drain. It uses a single CA4013 flip/flop. One section forms a pulse generator. The generator produces 100uS pulses at a rate of about 1 per second . . . [Hobby Circuit designed by David A. Johnson P.E.,  05/07/06]

  • Clear Fluid Detector #2 -  Using an ultra low power technique, this circuit detects when a clear fluid is inside a piece of clear plastic tubing. It can be used for fluid level control and monitoring . . . [Circuit by Dave Johnson P.E.,  10/22/05]

  • Color Film Makes Optical Filter -  This isnít an electronic circuit but the file shows the curve for an optical filter made from exposed color film. The material blocks most visible light but is very transparent to 880nM infrared light. Kodak 100ASA is exposed to "cool white" fluorescent light for about 5 seconds . . . [Circuit by David A. Johnson P.E.,  01/01/98]

  • Convert Solar Powered Light to Flasher -  The circuit converts an off-the-shelf solar powered LED path light from producing a steady state light to one that produces a flash. This circuit includes a tiny dual Schmitt trigger inverter IC which form the pulse generator and the daylight sensor circuit. The circuit produces a positive pulse, which feeds the constant current LED driver circuit.  . . . [Circuit by David A. Johnson P.E.,  03/02/10]

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Cascode Light Receiver Circuit -  This page provides a detailed explanation of how the modified cascode light receiver circuit operates. The cascode technique in conjunction with an inductive load provides very high current to voltage conversion as well as very high speed . . . [Circuit by David Johnson P.E.,  02/15/02]

Cell Phone Solar Powered Charger -  The simple circuit below regulates the voltage from a 6v solar panel to a fixed +5v. That voltage can be fed to any cell phone or USB connected portable device, to charge its battery. The circuit uses a Reg113-5 voltage regulator from Texas Instruments . . . [Hobby Circuit designed by Dave Johnson P.E.,  01/02/11]

Circuit Indicates Time to Dust -  I have used the circuit below for many different applications, which require ultra low power drain. It uses a single CA4013 flip/flop. One section forms a pulse generator. The generator produces 100uS pulses at a rate of about 1 per second . . . [Hobby Circuit designed by David A. Johnson P.E.,  05/07/06]

Circuit rejects ambient light -  06/10/99 EDN Design Idea   In some applications, you need to detect light signals in the presence of background light whose intensity can change by orders of magnitude. The circuit in Figure 1 uses an integrated photodiode/amplifier (OPT201) in. . .  [by Massimo Gottardi, IRST, Trento, Italy]

Clear Fluid Detector #2 -  Using an ultra low power technique, this circuit detects when a clear fluid is inside a piece of clear plastic tubing. It can be used for fluid level control and monitoring . . . [Circuit by Dave Johnson P.E.,  10/22/05]

Color Film Makes Optical Filter -  This isnít an electronic circuit but the file shows the curve for an optical filter made from exposed color film. The material blocks most visible light but is very transparent to 880nM infrared light. Kodak 100ASA is exposed to "cool white" fluorescent light for about 5 seconds . . . [Circuit by David A. Johnson P.E.,  01/01/98]

Color Sensor -  Colour sensor is an interesting project for hobbyists. The circuit can sense eight colours, i. e. blue, green and red (primary colours) ; magenta, yellow and cyan (secondary colours) ; and black and white. The circuit is based on the fundamentals of optics and digital electronics. The object whose colour is required to be detected . . . 

Color Sensor -  This is a circuit for a color sensor which uses three LDRs to detect the color of object placed in front of it and indicates the same by glowing a corresponding color LED among 8 LEDs. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved]

Color sensor circuit -  I built this color sensor to equip my third implementaton of brick sorter. Michael Gasperi presents such a sensor in an article of Nuts and Volts magazine. His circuit is based on an input multiplexor. Three CdS photo-resistors, connected to this multiplexor, receive light through RGB colored filters (cleverly done with Lego transparent bricks). . . .  [Philippe "Philo"Hurbain]

Color Sensor for Robot -  I'm developing a simple, active, color, object sensor for my robots based on three ultra-bright LEDs. An old-fashioned cadmium-sulfide sensor detects the brightness of the reflected red, green, and blue as each is turned on individually. . . . 

Convert Solar Powered Light to Flasher -  The circuit converts an off-the-shelf solar powered LED path light from producing a steady state light to one that produces a flash. This circuit includes a tiny dual Schmitt trigger inverter IC which form the pulse generator and the daylight sensor circuit. The circuit produces a positive pulse, which feeds the constant current LED driver circuit.  . . . [Circuit by David A. Johnson P.E.,  03/02/10]

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Light Dependent Resistor Circuits / Photocell Circuits
Light Dependent Circuits:  # - C      D - H      I- N      O- Z


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