solid state flashing lamp schematic

220V Solid State Flashing Lamp with 555

This 220V mains operated solid state flashing lamp circuit uses a 555 timer IC to control the ON and OFF times of a triac which controls power to the load. The power supply for the IC is obtained by half wave rectifier (D1), a stabilizer circuit (D2 and R1) and filter capacitor C1. The lamp stays ON for about 1 second and OFF for about 0.7 seconds. You can change these times by choosing other values for R2 and R3.

Flashing Lamp Circuit Schematic

solid state flashing lamp schematic

220V mains operating flashing lamp circuit schematic


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  • a couple questions

    Latest thought: the relays might face insufficient triggering current problem…

    Perhaps only the most sensitive might work i.e. the 5V High sensitivity Omron needs a 30mA triggering current (
    I say so, because the TRIAC BT136 ( has a similar 30mA triggering current in your T2-G+ configuration.

    Or do you recommend a phototriac optocoupler optocoupler like the Vishay VO4154D?


  • a couple questions


    nice and simple.

    Question 1: I want to use an incandescent bulb of <60W (pure ohmic load) no problem I suppose.

    Question 2: I do have a small mechanical relay 12V (240V 8A) to use instead of the TRIAC.

    Question 3: If I use a full 4 diode rectifier I think the filter capacitor C1 can be smaller value. Anyway small difference.

    When I built it I will post back.

  • mohammedshifaa

    what is the input voltage please??

    • Srood Max

      Mohammed, if you look at the title of this article it obviously says (220 V), and it repeats that in many places in the article.

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