On-off controller

  
The ac line-operated on/off controller is a simple, reliable solid-state alternative to a motive driven cam switch. Time 1 and time 2 are programmed by diodes to be 8 hours and 20 hours respectively. The TIM1 output is buffered by a transistor to supply gate current to a triac which switches the output load
On-off controller - schematic

When power is applied to the circuit, the output load is switched on for 8 hours then off for 20 hours repeatedly.




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