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Category: Sensors Detectors / Light Sensing Circuits This circuit is also crossed to: Alarm Circuits , Lighting Views: 1702 Rank: 0 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) The sun shining on this device will provide a high to one of the NAND gates. This will cause another NAND gate to oscillate which will drive another gate to output a 100hz tone. The transistor provides drive for the speaker. visit page.
Related circuits The LX1970 light sensor can be used in conjunction with an LCD Front or Back Light Controller such as the LX1992 for LEDs or the LX1689 for CCFLs. This application note describes how to design in the LX1970. The circuit provides illumination when darkness comes. By using the gain available in darlington transistors, this circuit is simplified to use just a photodarlington sensor, a darlington amplifier, and three resistors. LIGHT DETECTORS WITH AMIBIENT LIGHT COMPENSATION These circuits were taken from a few application notes on infrared remote control devices. They use a current compensation method to separate the modulated light pulses from ambient light. They appear to have limited bandwidth and may only work at the 30KHz to 50KHz frequencies often used by TV... BROAD BAND 5MHz OPTICAL FIBER RECEIVER II If the above circuit it still too slow, you can try this circuit. What it lacks in sensitivity it makes up for in speed. The circuit attaches a plastic fiber optic PIN photodiode assembly to a small box containing a small 3v battery and a standard BNC plug. When the box is plugged into to the... 10MHz TO 20MHz LASER LIGHT DETECTOR This circuit was originally designed to detect laser light pulses for an optical Ethernet communications system. It has good ambient light immunity. FET INPUT HIGH SPEED LIGHT DETECTOR This circuit is yet another design that converts current from a PIN photo diode to a voltage. It has a bandwidth that extends beyond 50MHz. For a dark photocell, high resistance, the vohage across the diac rises rapidly with the line voltage due to the current through C 1, triggering the diac early in the cycle. Line-voltage-automatic-night-light This circuit has stable threshold characteristics from its dependence on the-photo diode current in the Ll4Cl to generate a base emitter voltage drop across the sensitivity setting resistor. The double phase shift network supplying voltage to the ST-4 trigger insures triac triggering at line... Wakeup on Day Light Alarm Circuit and Explanation
DIY Accelerometer Car Alarm
Comments
ishel wrote on Jan 6, 2009
can i have the procedure in making this sun-up alarm?
for my project.thank you
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