The switch, in this case, is off. The second diagram shows a very similar circuit but with the resistors connected to the opposite supply lines.

In DC voltage applications, the RC snubber network is typically wired across the relay contacts, whereas in standard AC ...

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Instead, it uses diodes or other switching elements to transfer charge between capacitors in stages. Each stage will effectively increase the voltage by the supply voltage — in theory.

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R 1 ‘s voltage drop limits the zener diode’s voltage value that the circuit measures. If R 1 ‘s value is 1Ω, then the voltage drop across it is insignificant and, in millivolts, is equal to the zener ...

With the diodes in opposition allowing the current to flow both ways, they provide separate paths through the circuit, producing a pulsing DC current that performs work on a load resistor.

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2. Typical voltage-clamping protection circuit showing distortion due to diode junction capacitance (20-dBu output). Dotted trace is the measurement floor, i.e. diodes removed.