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Neon tubes brightness adjustement

2018-02-28 12:31  
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The brightness of a neon tube can not adjust as easily as that of a bulb with Incandescent tube because it starts only when a voltage much higher than that of the network, then remains on at electrical network voltage.
Normally, the high starting voltage is obtained by the interruption of current which circulates through a choke coil. This is usually a starter to ensure a sufficiently large current through the tube filaments.
These starter functions are taken over by circuit presented which also allows adjustment of the neon brightness.

When we switch on the neon tube, the brightness control potentiometer, P1, should be placed on the position of maximum brightness of the tube, to facilitate the start.

Schematic of neon light adjustement circuit


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