Two LEDs with different color (e.g., red and green), you can build 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 8-220 V. When measuring AC voltage, both diode glow, but if it is constant — lights one of them depending on the wiring polarity indicator. The scheme proposed by the Czechoslovak journal “Amaterske Radio”.
Measure the mains voltage from 110 to 220 In a short-term need. a current-limiting resistor R1 (see Fig.). In addition to the household, the indicator is used and motorists.
Czech 1NZ70 Zener can be replaced with a tense domestic stabilization 5-6 In, for example Д815А, the diodes V1 and V5 — any low-power silicon, for example D226. LEDs can be АЛ102Б (red) and AL 102V (green).
Recommend to read
LIGHT CONTROLS THE DOOR
Device for automatically switching-off the lights in the bathroom (dressing) room are designed to seamlessly allow the following situations: 1. In the served room is unoccupied, the...
TRAILER FOR MOTORCYCLE
Many owners of motorcycles seek how to more effectively use their existing vehicle. In the construction of various buildings, the improvement of the gardens and doing other chores there...
