Universal indicator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Universal indicator. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Indicators, detectors, metal detectors

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On two LEDs with different glow colors (for example, red and green), you can assemble a simple indicator for voltages from 4,5 to 220 V. It is also able to determine the polarity of the source in the range of 8-220 V. When measuring AC voltage, both diodes glow, and if it is constant, one of them lights up, depending on the polarity of the indicator connection. The scheme was proposed by the Czechoslovak magazine "Amaterske Radio".

It is necessary to measure mains voltages from 110 to 220 V for a short time so that the current-limiting resistor R1 does not overheat (see Fig.). In addition to household use, the indicator is also used by motorists.

Universal indicator

Czech zener diodes 1NZ70 can be replaced with domestic ones with voltage stabilization of 5-6 V, for example D815A, diodes V1 and V5 - with any low-power silicon ones, for example D226. LEDs can be AL102B (red) and AL 102V (green).

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