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Indicator mains power allows you to visually define, lowered, increased or normal voltage.
Schematic diagram of the indicator, when typed in the figure, consists of two neon lamps MH-5, SN-1 or SN-2 and four resistors.
The resistors chosen experimentally in such a way that would when the rated voltage of burning a, when the voltage - two lamps and low-voltage does not light no lamp.