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need a 12v dc relay with coil res 60 ohms


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yohojo 
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Posted: June 18, 2012 at 2:41 AM / IP Logged  
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
KPierson 
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Posted: June 18, 2012 at 7:21 AM / IP Logged  
Why does it have to be 60 ohms?
Kevin Pierson
howie ll 
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Posted: June 18, 2012 at 11:20 AM / IP Logged  
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.
yohojo 
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Posted: June 18, 2012 at 7:15 PM / IP Logged  
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
Ween 
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Posted: June 18, 2012 at 10:46 PM / IP Logged  
determine the resistance of the Bosch/Tyco relay, add resistor in parallel to reduce total value to the 60 ohms needed.
mark
howie ll 
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Posted: June 19, 2012 at 1:25 AM / IP Logged  
Good thinking Mark, I'll measure one in a couple of hours and post back the results.
howie ll 
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Posted: June 19, 2012 at 6:42 AM / IP Logged  
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.
KPierson 
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Posted: June 19, 2012 at 7:01 AM / IP Logged  
I checked four of mine and they were 88 ohms, 91 ohms, 90 ohms, and 91 ohms.
Kevin Pierson
oldspark 
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Posted: June 19, 2012 at 7:15 AM / IP Logged  
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.)    
howie ll 
Pot Metal - Posts: 16,466
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Posted: June 19, 2012 at 11:59 AM / IP Logged  
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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