Oscillator made with resistor, capacitor and neon lamp.

Oscillator made with resistor, capacitor and neon lamp. 90 Volts D.C. is put across a series RC circuit. A neon bulb is in parallel with the capacitor. When the capacitor charges up to 80 volts, the neon bulb flashes (breakdown voltage for this neon bulb is about 80 volts), draining the capacitor charge. The capacitor then begins to charge again, and the cycle repeats. The period T of the flashes of the bulb is the product of the Resistance and Capacitance (RxC). The resistance can be varied from 0 to 5.5 M ohms, and three different capacitors can be plugged in: 2 micro f, .47 micro f, and .01 micro f.