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Transistor 2N6027 Application Circuits

2016-05-09 02:47  
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The spark developed by the circuit is suitable for a gas ignitor. Capacitor C1 is charged through R1 and D1 toward peak line voltage. C2 is simultaneously being charged at a slower rate through R5. When the charge on C2 is sufficient to trigger the PUT, the SCR is triggered on, providing a rapid discharge path for C1 through the transformer primary. The SCR is triggered about 20 times per second with the component values shown. The L14G3 serves as a flame sensor. When ignition is achieved and sensed by the photodetector, the low VCE prevents further SCR triggering.