• 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.

What is a VDR

Status
Not open for further replies.

bryan

Member
I have a circuit that call for a VDR acroos the contacts of a relay. I assume this is to protect against noise, or relay arcing. But what is a vdr?
 

Artie Ziff

New Member
bryan said:
I have a circuit that call for a VDR acroos the contacts of a relay. I assume this is to protect against noise, or relay arcing. But what is a vdr?
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.
 
Status
Not open for further replies.

EE World Online Articles

Loading
Top