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Simple DC or AC Voltage Indicator Circuit

2015-01-12 14:06  
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This circuit is a circuit diagram is not a novelty, but it proved so useful, simple and cheap that it is worth building. When the positive (Red) probe is connected to a DC positive voltage and the Black probe to the negative, the Red LED will illuminate. Reversing polarities the Green LED will illuminate. Connecting the probes to an AC source both LEDs will go on. The bulb limits the LEDs  current to 40mA @ 220V AC and its filament starts illuminating from about 30V, shining more brightly as voltage increases. Therefore, due to the bulb filament behavior, any voltage in the 1.8 to 230V range can be detected without changing component values. The following is a schematic drawing:


Simple DC or AC Voltage Indicator Circuit Diagram Simple DC or AC Voltage Indicator Circuit


P1 = Red Probe
P2 = Black Probe
D1 = 5 or 3mm. Red LED
D2 = 5 or 3mm. Green LED
LP = 1220V 6W Filament Lamp Bulb


Source :extremecircuits.blogspot.com


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