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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
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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