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Light pen interface circuit

2014-12-17 14:11  
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Light pen interface circuit
Whatever high quality photoelectric diode is fixed into exhaust pen pipe, it can face to the display screen to pick up light singal. If the diode is put in plastic lens, then it should use carbasus to sand the side of lens andto narrow the received light angle. This device is designed for matching VDM-1 display terminal. When light pen moves along the face of the screen, it can use a cathode ray oscillograph to monitor the output singal. In the dark space of screen, it will produce 5V DC level; in bright area, the level drops.

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