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Introduction voltage probe circuit

2017-08-10 15:50  
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This article is an introduction circuit voltage probe. The circuit is very simple, I hope for your help. When the positive (red) probe is connected to a DC positive voltage and the negative probe black, red LED lighting. Reversible polarity green  LED  lighting. An AC source is connected to two probe led to continue. Led lamp current limit 40 ma @ 220 v AC and its filament starts illuminating from approx. 30 v, more bright voltage increases. Therefore, since the behavior of the filament lamp, any voltage range of 1.8 to 220 volts can be measured component values ??change. In the circuit of a two colors (red and green) can be used instead of lead D1 and D2. This circuit is not new, but it proved so useful, simple and cheap, it is worth building.

Voltage Probe


D1________5 or 3mm. Red LED
D2________5 or 3mm. Green or Yellow LED

LP1_______220V  6W  Filament Lamp

P1________Red Probe
P2________Black Probe


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