Stackable 8x8 neon indicator bulb display
The NeonMatrix 8x8 matrix uses common neon indicator bulbs to display simple graphics.
They can be chained and controlled directly via SPI.
Operating voltage is about ~70V AC.
The circuit is pretty dangerous, all neon bulbs have high voltages on their legs, the 74HC595 shift registers are floating at mains/AC potential.
To generate a (mostly) safe high voltage neon supply, a 50 Hz mains transformer can be connected (in reverse) to the output of an audio amplifier. By playing a 50 Hz sine tone, the transformer outputs a variable high voltage:
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