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).
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SOCKET WITH SWITCH
Many household electrical appliances have their own switch. To use them will be much easier if you install a receptacle push-button switch.
“TRAP”… FOR FISH
It is not intended for fishing and for retaining fish during cooking to cleaning her scales. Anyone had to do this knows how difficult it is to hold slippery fish. However, secure on the...
