Neon flicker panel.

A panel of standard neon indicator lamps wired as 9 parallel circuits of six, each circuit is fed from a simple neon relaxation oscillator which fires each row of neons with a stream of very fast pulses. The first neon to strike clamps the voltage down preventing the rest in that line from striking until the capacitor is discharged, and the pulsed nature means that the neons tend to strike randomly and are affected by external factors like light and electrical fields. This results in a very random shimmering on the surface of the panel, which changes during the day. The circuit uses a single rectifier diode to charge all the capacitors from the mains supply via individual 470K resistors (on a 240V supply, use lower for 110V). The capacitors are all 10nF and the series resistors to the parallel neon circuits are all 1K. This panel operates at mains voltage.