Sequential ac flasher

  
This circuit uses a ring counter made up of Q3, Q4 and Q5. Q2 acts as an oscillator which triggers the SCRs Q3, Q4 and Q5 in sequence. When an SCR fires, a 0.2µ¥ capacitor provides commutation, shutting off the previous stage.
Sequential ac flasher  - schematic

Triacs Q6, Q7 and Q8 control lamps 1, 2 and 3 respectively.




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