Flashing Neon lamp for Soldering iron


message: How can I make a flashing neon lamp – 240 volt AC

I have been trying for 3 hours ( R-C circuits) but no success. I want to include it in my soldering iron socket to show the power is on.

Mail from HJ of UK

These circuits may help, let me know if this works.

Neon Lamp Multivibrator ASCII Circuits

    I am sure a reading of above will help make your own. do not forget, i like a feedback.


    For the 1 Meg use two 470K in Series for 230V AC, that is safer. The circuit is live, so take precautions. The 0.47 Micro Farad can be increased if you want a slow flash. If the Mains 50/60 Hz Flicker is too much, the 1 uF can be made 2 uF, or use 4 – 1N4007 as a bridge rectifier.


    Flashing Neons (NE-2 / NE-51) second from top

    User Feedback –

    R1 of 4.7M and C2 of 0.47uF Works well at 230V AC. Try your own Combination. Less than 1M may damage Neon.



    Product Design - Industrial Automation and Instrumentation.

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