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PROJECTION_LAMP_VOLTAGE_REGULATOR

2016-08-04 10:47  
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PROJECTION_LAMP_VOLTAGE_REGULATOR
Circuit will regulate RMS output voltage across lamp to 100 V ±2% for input voltages between 105 and 250 VAC. Light output of 150-W projection lamp is sensed indirectly for use as feedback to firing circuit Q1-Q2 that controls conduction angle of triac Q3. Light pipe, painted black, is used to pick up red glow from back of reflectorinside lamp, which has relatively large mass and hence has relatively no 60-Hz modulation.- Circuit Applications for the Triac, Motorola, Phoenix, AZ, 1971, AN-466, p 12.