Voltage spike

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=70323
Printed Date: June 01, 2024 at 12:56 PM

Topic: Voltage spike

Posted By: HICKMANAE3
Subject: Voltage spike
Date Posted: January 08, 2006 at 11:16 AM

I have 4 tv monitors in my car that is hook up to a 20 amp relay (recieves power when the car is on, and no power when the car is off). All four monitors although is pulling 6 amps of current..

When i turn the car on, i get a voltage spike on the monitors, so i gotten 2 3amp rectifer diodes. Will hooking two diodes up in parallel acrosss a relay stop the voltage spike by equaling the additional proerpty of 6 or do i need to do something else.

This is the exact way the relay is set up, where exactly would I place the diode

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No security system can beat the tow truck :(

Replies:

Posted By: hotwaterwizard
Date Posted: January 08, 2006 at 6:29 PM

Just like in this picture. Across 85 and 86.

posted_image

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: HICKMANAE3
Date Posted: January 08, 2006 at 6:41 PM

But can I wire two 3 amp diodes in parallel seris to make an additional property of 6 ampson the relay.

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No security system can beat the tow truck :(

Posted By: hotwaterwizard
Date Posted: January 08, 2006 at 7:03 PM

You are not using the Diode as a fuse.

The coil of the Relay is less than 1 amp.

The load of the coil is protected from spiking a voltage to the whole thing.

One diode is all you need for protection.

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: hotwaterwizard
Date Posted: January 08, 2006 at 7:07 PM

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: HICKMANAE3
Date Posted: January 10, 2006 at 11:13 PM

noo, its not working, I connected the 3ampdiode exactly how you posted it and im still getting that voltage spike on the screen when i start the car

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No security system can beat the tow truck :(