Magic eye

I recently acquired an old EM80 magic eye tube. It seemed cool just to play around with it and maybe even make a nice sound level indicator - the thing it was made to do.The filament was OK, so I made a nice little bit of electronics around it.

The high voltage (250V) is generated by a voltage doubler and a transformer used backwards.

Here's the schematic (click for better resolution):



Pictures of the eye in action:

Darkness (long exposure):





And here's what's inside of it:


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