The acousto-optic circuit diagram of electron gun targeting

Published:2011/6/23 23:01:00 Author:Nicole | Keyword: acousto-optic, electron gun, targeting | From:SeekIC

The optical control monostable trigger circuit is composed of 555 and luminescence resistance RG, RP, R2, C1. When there is no light, RG is high resistance, time base circuit 555's 3 foot is low level, then LED1, LED2 which have blue light are lighted, the audio circuit does not work; when the infrared beam which is emitted by infrared electron gun hits the uminescence resistance RG of the small hole's target circuit, RG turns to low resistance, 555's 2 foot is low level(<1/3 VDD), the monostable circuit reverses, 3 foot turns to high level, then LED3, LED4(blue)are turned off, LED3, LED4(green)are turned on, at the same time, the audio circuit is triggered, it sends out sound. The acousto-optic duration time is decided by the temporary stability time of the monostable circuit, namely, td=1.1R2C1.



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