No LED to mains- here's a neon lamp to mains

Thread Starter


Joined Apr 28, 2012
Couldnt resist to build a blink circuit.

First with a 1uF capacitor, only good for 50v but worked the whole night. 1 M Ohm.

Then today tried out a 200V LED panelmeter- I had to lower the resistance to 120K, and increase the capacitors to 2x 4uF.

These are green phosphor coated neons by the way.

The joule thief I made a while ago by the way can be used as LED tester- only required to hold the LED on one end. Its useful when you want to test a couple of clear LEDs for their color.

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But it doesnt work with green neon lamps they need a larger voltage.

-Could try 2x batteries
-Could try different transistor
-Could try different turns ration