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VDR stands for voltage dependant resistor,
Similiar to a MOV (metal oxide varistor) that only conducts after a certain
voltage threshold is reached.
Normally having a high impedance, it rapidly drops its impedance value to absorb any spikes that may be present.
Voltage dependant resistor is term that was used a lot about 25 years ago, they used to be used in TV sets.
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