proper type of relay for this

Home / the12volt's Install Bay / Relays / proper type of relay for this (

Topic Closed)

Welcome Guest :)

Members

< Prev Topic Next Topic >

rfhelp

Member - Posts: 31

Joined: March 23, 2009

Location: British Columbia, Canada

Posted: March 23, 2009 at 12:52 PM / IP Logged

I am using an rfid module to trip a standard automotive relay. I have been told that this can damage the rfid board over time so I need to use a low power relay. I was given a radio shack relay number 275-249 which is a 5a mini pcb relay dpdt. I am told I need this to trip the larger automotive relay.

DPDT 5A at 240VAC/24VDC

Nominal coil rating of 12VDC, maximum 15.6VDC
Pickup/dropout voltage 9.6/0.6VDC

Nominal coil current 60mA

proper type of relay for this -- posted image.

Being in Canada I cannot find this relay locally and was wondering if there is "NEWARK" relay that is the same. I have called three diff electronics shops locally and they have been no help.

rfhelp

Member - Posts: 31

Joined: March 23, 2009

Location: British Columbia, Canada

Posted: March 23, 2009 at 12:56 PM / IP Logged

sorry

proper type of relay for this -- posted image.

dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: March 24, 2009 at 1:00 AM / IP Logged

You'd be much better off using a transistor driver instead of trying to drive the relay directly from your circuit. It'll draw much less current from your rfid, and protect it from the voltage spikes that the relay will put out when it turns off.

You'll be able to use any standard relay instead of needing to find a specialty low power relay.

i am an idiot

Platinum - Posts: 13,674

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: March 24, 2009 at 2:29 AM / IP Logged

Does the RFID module supply a switched ground or positive output? If ground out, you can use the following diagram. The transistor is available from RadioShack for $1.59

proper type of relay for this -- posted image.

If the module provides a positive output, purchase One of these instead. and let me know. I will have to get you a new picture.

KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: March 24, 2009 at 5:38 AM / IP Logged

The size of the relay coil won't dramatically effect the destructive coil breakdown voltage. Instead of trying to find a "different" relay simply put a diode across the coil to supress the spike.

Kevin Pierson

Sorry, you can NOT post a reply.
This topic is closed.

Printable version

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Search the12volt.com

Follow the12volt.com

Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

proper type of relay for this

Sorry, you can NOT post a reply.This topic is closed.

Sorry, you can NOT post a reply.
This topic is closed.