This flashing light circuit uses triacs to generate an intermittent light with variable frequency. Additional components are the D1 diode and semi adjustable potentiometer R2. The trigger capacitor C1 is increased from 0.1 µF to 220 µF so that the triacs can be ordered for several successive periods. C1’s loading time is longer, so that the lamp flashes with one pause of several periods.
Blinking frequency can be adjusted with P1. Semi-adjustable potentiometer R2 regulates the current gate. This setting affects the lighting duration of the lamp because it also establish the C1’s discharging time.