Neon tube flasher

Posted on Nov 14, 2012

The voltage required to ignite the neon tube is obtained by using an ordinary filament transformer (240-6 V) in reverse. Battery drain is quite low, around 1 to 2 milliamps for a nine volt battery. The pulses from Ql, unijunction transistor, operated as a relaxation oscillator and are applied to Q2 which in turn drives Q3 into saturation. The sharp rise in current through the 6 V winding of the transformer as Q3 goes into saturation induces a high voltage in the secondary winding causing the neon to flash

Neon tube flasher
Click here to download the full size of the above Circuit.

The diode D1 protects the transistor from high voltage spikes generated when switching currents in the transformer.

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