need a 12v dc relay with coil res 60 ohms
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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=131640
Printed Date: May 14, 2025 at 10:44 PM
Topic: need a 12v dc relay with coil res 60 ohms
Posted By: yohojo
Subject: need a 12v dc relay with coil res 60 ohms
Date Posted: June 18, 2012 at 2:41 AM
i need a 12 volt dc relay with a coil impedance of 60 ohms, i have checked jaycar and farnells both in australia and i can not find anything, the closest i have found it a 24 volt relay with the correct impedance
any help with what really and were to buy would be greatly appreciated
Replies:
Posted By: KPierson
Date Posted: June 18, 2012 at 7:21 AM
Why does it have to be 60 ohms?
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Kevin Pierson
Posted By: howie ll
Date Posted: June 18, 2012 at 11:20 AM
X 2 with Kevin, why 60?
Most Bosch/Tycho automotive relays are if I remember about 85-95ohms, I believe KP knows more about this than me, surely for most circuits (and a description of what the circuit is would help) 60-100 ohms, the difference doesn't matter.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: yohojo
Date Posted: June 18, 2012 at 7:15 PM
It's for a project I need to source parts it just says I need 12v relay a 60 ohm coil no other specs as to why, it can't be any greater than 60 ohms now because that would change the base current needed to saturate my transistor
Posted By: Ween
Date Posted: June 18, 2012 at 10:46 PM
determine the resistance of the Bosch/Tyco relay, add resistor in parallel to reduce total value to the 60 ohms needed.
mark
Posted By: howie ll
Date Posted: June 19, 2012 at 1:25 AM
Good thinking Mark, I'll measure one in a couple of hours and post back the results.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: howie ll
Date Posted: June 19, 2012 at 6:42 AM
I tried two different Bosch style automotive relays, one was 78, the other 85 ohms, start with 80ohms resistance as described by Ween and play till you get the required impedance.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: KPierson
Date Posted: June 19, 2012 at 7:01 AM
I checked four of mine and they were 88 ohms, 91 ohms, 90 ohms, and 91 ohms.
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Kevin Pierson
Posted By: oldspark
Date Posted: June 19, 2012 at 7:15 AM
I too question why 60 Ohms.
I would normally interpret that as "no less than 60 Ohms" - ie, no more than a ~200mA load. (It's not driven by a 555 timer per chance?)
I have Jap relays that are ~60 to 68 Ohms, but using a common relay and a parallel resistor is the best suggestion.
But again, I doubt that needing to be as low as 60 Ohms is really that critical. (And Silicon Chip "Circuit Notebook" info is often erroneous.)
Posted By: howie ll
Date Posted: June 19, 2012 at 11:59 AM
Omron list G8JR-1A7T-R-DC12, automotive cube type, with the built in resistor it's 64.5 ohms, but they state +/- 15% tolerance.
Forget what I said about 80 ohms, I'd now suggest nearer 1.5kR.
I suggest you Google OMRON and go to the relay section and start looking!
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
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