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LAMP_CONTROL

2016-08-06 09:50  
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LAMP_CONTROL
Phototransistor Q1 senses lamp intensity and controls firing angle of scr's Q3 and Q4 through unijunction transistor Q2.-R. L. Carvajal, Phototransistor Regulates Illumination Intensity, Electronics, 38:20, p 101.