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Electrical Diodes
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Xed Sal
 


Member Since: 18 Sep 2017
Location: London
Posts: 235

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Zermatt SilverDiscovery 4
Electrical Diodes

Hi, is anyone on here clued up about diodes. Need to work out what one I need to protect reverse circuit to a relay.
  
Post #185969520th Sep 2017 5:05 pm
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NickJ
 


Member Since: 11 Oct 2010
Location: there's no f in point
Posts: 2137

2006 Discovery 3 TDV6 S Auto Zambezi SilverDiscovery 3

Sorry, could you explain further, is this for suppression across the coil?
  
Post #185971720th Sep 2017 5:53 pm
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Mr.Tom
 


Member Since: 01 Jun 2014
Location: St Neots
Posts: 1641

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Waitomo GreyDiscovery 4

Please expand? What would the relay be switching to be at risk of being reverse powered and what side of the relay.
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Post #185977420th Sep 2017 7:30 pm
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TigerRecovery
 


Member Since: 31 May 2017
Location: Long Stratton, Norwich, Norfolk
Posts: 901

Wales 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Waitomo GreyDiscovery 4

A lot of relay coils have resistors or diodes across them to reduce the back emf generated when the relay is switched off. I've seen upto 148V on a 12v system when there was only a resistor across the coil.

I think you're looking to stop voltage going back down a circuit for lighting possibly when switched on? What circuit, what component and what current are you looking at drawing?
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Post #185978820th Sep 2017 8:07 pm
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