The lamp provides no indication below the strike voltage of the neon lamp, and so cannot detect certain hazardous leakage conditions.
22.
When turntable contained built-in strobes, it was almost always just such a neon lamp ( with or without the rectifier ).
23.
If the threshold element is a neon lamp, the circuit also provides a flash of light with each discharge of the capacitor.
24.
So what gets " used up " in a neon lamp, when it is not operated at excessively high voltage or current?
25.
Neon lamps are used both to produce light as indicators and for special-purpose illumination, and also as circuit elements displaying negative resistance.
26.
This may be a sign of aging of the indicator bulb, and is exploited in the decorative " flicker flame " neon lamps.
27.
Another form of tester uses a miniature neon lamp; the negative electrode glows, indicating polarity on DC circuits, or both electrodes glow, indicating AC.
28.
A neon lamp takes very little current to light, and thus can use the user's body capacitance to earth ground to complete the circuit.
29.
The neon lamp produces a brief flash of light each time it conducts, so the circuit can also be used as a " flasher " circuit.
30.
Because of their comparatively fast response time, in the early development of television neon lamps were used as the light source in many mechanical-scan TV displays.
