1st July 2008, 12:45 PM
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#1 (permalink) |
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GTR Register Member
Join Date: Jun 2002
Location: Aberdeen
Posts: 2,057
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resistors....
i have an inlet temp display that works on 5v. I have found a supply that puts out 5v when the key is turned to ACC, but goes upto 6.1v when the car is running.
What resistor will be best to fit inline to lower this 6.1v to <5v
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'91 R32 GTR - TimeAttack Club Class - Sponsored by Ultralite & The Garage '81 Porsche 911 SC 3.0 '08 Navara Outlaw Track Scotland |
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1st July 2008, 03:33 PM
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#2 (permalink) | |
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New Users
Join Date: Feb 2007
Location: Black R33 GTR V-Spec
Posts: 1,629
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I wouldn't use whatever it is you've found. Best thing would be to find some in-car gadget with a ciggy lighter type power supply putting out 5v, and use the power supply.
Anything which can be used on USB generally uses 5V, so hacking the power adaptor is easy. Using a resistor depends on the current the device draws, so without that info a value can't be suggested.
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2nd July 2008, 12:31 AM
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#4 (permalink) |
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GTR Register Member
Join Date: Jan 2008
Location: Sunny Belgium...right :)
Posts: 387
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Little off topic here, but does someone know where to get the inlet temp displays from? Cheapish...
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Using the fireblade for now...As it takes ages to get a foreign car registered in this anti-petrolhead land off french fries eating maniacs :) |
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2nd July 2008, 09:07 AM
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#5 (permalink) |
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GTROC Member
Join Date: Apr 2006
Location: Scotland
Posts: 674
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Hi Adam,
Maplin have a few things that would help you: Maplin > In-Car Power Adaptors I've not had time to look through them but there must be something in the above that will give you 5V inside the car from 12V. |
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