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Simple Neon Flasher Circuits

The post details a few simple neon flasher circuits, which can create beautiful flashing light effect using ordinary neon bulbs.


The ionization potential of a neon utilized in the circuit is around 70V. To the acute left of circuit 1, a neon is connected.

Simple Neon Flasher working


A 0.47 microfarad capacitor connected across the neon gets charged through a 1 MOhms resistor.

The moment the voltage across the capacitor reaches 70V, the neon gets ignited because the capacitor starts discharging through it.

The capacitor is discharged through the lamp, creating a flash till the voltage falls below 45V, a sustainable voltage for the neon to glow.

It is a neighborhood of the circuit. Smaller values of R and C will end in a rise within the frequency and the other way around.

The other two circuits are for the second and third neons respectively. All the circuits operate an equivalent principle.
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