What is bulb

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Vindhyachal Takniki

Joined Nov 3, 2014
482
1. In attached pic what is this bulb. In circuit it is directly connected to 220Vac manis via a 470k resistor as you can see pic.
It has two filaments is it as you can see. What ac is applied it both glows. But when ac is given by clipping negative half by a diode, only one filament glows.
 

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MaxHeadRoom

Joined Jul 18, 2013
19,747
A Neon is also used in the tester type mains screwdrivers that use body conductance to earth to indicate a live circuit, the pocket clip has to be held in order to complete the circuit for the neon to light.



Max.,
 
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