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LAMP_PREHEATER

2016-08-12 12:58  
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LAMP_PREHEATER
Unijunction transistor triggers LASCR (light-activated scr) late in each half-cycle, with R2 determining lamp current so filament is heated but not visible. This preheating minimizes thermal stresses during programmed operation of lamps by control beam hitting LASCR, as for theaters or fountains.-E. K. Howell, Light-Activated Switch Expands Uses of Silicon-Controlled Rectifiers, Electronics, 37:15, p 53-61.