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Voltage, otherwise known as electrical potential difference (denoted ∆V and measured in volts) is the difference in electric potential between two points (adapted from Wikipedia). Voltage can be constant (DC) or varying (AC).

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Adjustable over voltage protection

I want to build an over voltage protection with adjustable voltage limiter. Operation range would be 5-12 volts. … So the relay will be switched on if voltage is > 5 volts, (set by VR), and again in will be switched off if voltage goes under 5 volts. …
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