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Variable resistor R1 adjusts the light threshold at which the circuit triggers. R1's value is chosen to match the photocells resistance at darkness. The circuit uses a CMOS 4001 IC. Gate U1a acts as the trigger, U1b and c form a latch.
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www.zen22142.zen.co.uk/Circuits/Switching/ldet.htm
www.zen22142.zen.co.uk/Circuits/Switching/ldet.htm
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There are two versions of the "8 Photo-Detector" circuitboard. Circuitboards and parts are available for both versions of this circuit ... (The LEDs are ON when the Phototransistors are exposed to light.
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home.cogeco.ca/~rpaisley4/8PhotoDetect.html
home.cogeco.ca/~rpaisley4/8PhotoDetect.html
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This page features basic, visible light photo-detector circuits that can be used to detect trains. These methods would normally be used with the photo sensor mounted between the rails. ... Infrared Light Photo-Detector Circuit...
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home.cogeco.ca/~rpaisley4/PhotoDetectors.html
home.cogeco.ca/~rpaisley4/PhotoDetectors.html
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Visible and Infrared Light Detectors Basic CdS Photocell Detector, Basic Phototransistor Detector, Infrared Light Photo-Detector Circuit, Phototransistor Detector Relay Driver...
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www.educypedia.be/electronics/circuitssensorslight.htm
www.educypedia.be/electronics/circuitssensorslight.htm
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: Cadmium sulphide or cadmium sulphide (CdS) cells rely on the material's ability to vary its resistance according to the amount of light striking the cell. The more light that strikes the cell, the lower the resistance. ... ; This is a light detector circuit.This circuit will generate sound when light falling on CdS.
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www.coolcircuit.com/circuit/light_detector_555/index.ht...
www.coolcircuit.com/circuit/light_detector_555/index.html
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Light Barrier Detector -designed by Naveen P N Click here for the circuit diagram ... This simple circuit using a single transistor turns ON the relay when light falls on the LDR. The potentiometer is adjusted for the required sensitivity. The power supply is 6V. Be careful about the impedance of the relay.
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www.electronic-circuits-diagrams.com/sensorsimages/sens...
www.electronic-circuits-diagrams.com/sensorsimages/sensorsckt8.shtml
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Light/Dark Detector, schematics ... This handy little circuit can tell the difference between darkness and light, making it very useful for switching on and off signs, porch lights or other things when it gets dark or light. ... Home Projects Security and other sensors and detectors Light/Dark Detector...
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www.electronics-lab.com/projects/sensors/022/
www.electronics-lab.com/projects/sensors/022/
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20MHz LIGHT RECEIVER FRONT-END CIRCUIT; SIGNAL OUT; LIGHT POWER TO VOLTS CONVERSION = APPROX. 20mV/uW; S G D; TOP VIEW; FET; 20MRVR2.DSN A; 20MHz LIGHT RECEIVER FRONT-END CIRCUIT; A; Wednesday, June 14, 2000 1 1; Title;
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www.discovercircuits.com/PDF-FILES/20mrvr2.pdf
www.discovercircuits.com/PDF-FILES/20mrvr2.pdf
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When light falls on the phototransistor, ... The challenge: if we substitute an led as the detector (let's say because our junkbox has leds, resistors, and transistors lying around...but dont have any photo transistors)...can we redisign a simple circuit that operates in a similar manner using two LEDs...one for input,
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www.evilmadscientist.com/article.php/nightlight
www.evilmadscientist.com/article.php/nightlight
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