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220V Dual Alternate Lamp Flasher Circuit

Last Updated on January 19, 2025 by Swagatam 13 Comments

This is a mains operated transformerless flasher circuit that can be used for alternately switching a couple of CFL or similar 220V/120V lamp to produce a decorative lighting effect.

Table of Contents
  • Circuit Operation
  • Power Supply

Circuit Operation

The below shown design depicts a simple mains operated dual or alternate lamp flasher, which is designed to flash or blink two mains operated lamps alternately at a specific rate as determined by the 100k pot adjustments.

warning message: electricity is dangerous, proceed with caution
220V Alternate Lamp Flasher Circuit diagram

The circuit stage built around T1 and T2 is an ordinary astable multivibrator wherein the transistors switch alternately at a given rate as set by the values of C1, C2 and /or the values of the pots VR1 and VR2.

VR1 and VR2 can be discretely adjusted to produce different sets of flashing rates for the two lamps, or can be fixed in the middle for generating a uniform flashing pattern for the lamps.

The lamps are switched through the indicated triacs whose switching is controlled by the switching rate of the transistors, during the transistor OFF periods the traics are switched ON and vice versa, this effect is not simultaneous, rather implemented alternately for the traics giving rise to the proposed alternate flashing effect for the lamps.

Power Supply

THE CIRCUIT IS NOT ISOLATED FROM MAINS AC, AND IS THEREFORE EXTREMELY DANGEROUS TO TOUCH IN POWERED CONDITION AND WITHOUT AN INSULATED ENCLOSURE. EXTREME CAUTION IS ADVISED WHILE TESTING OR BUILDING THIS CIRCUIT.

The entire circuit is powered through a simple 12V stabilized transformerless power supply made by using a high voltage capacitor 474/400V, a rectifier diode and a 12V zener diode.

The 100uF capacitor filters the 12V stabilized half rectified output from the 1N4007 output and feeds a clean DC to the rest of the circuit for the intended operations.

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Filed Under: Lamps and Lights Tagged With: 220V, Alternate, Dual, Flasher, Lamp

About Swagatam

I am an electronics engineer and doing practical hands-on work from more than 15 years now. Building real circuits, testing them and also making PCB layouts by myself. I really love doing all these things like inventing something new, designing electronics and also helping other people like hobby guys who want to make their own cool circuits at home.

And that is the main reason why I started this website homemade-circuits.com, to share different types of circuit ideas..

If you are having any kind of doubt or question related to circuits then just write down your question in the comment box below, I am like always checking, so I guarantee I will reply you for sure!

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