I'm too new to this list to have the circuit previously posted, but I do have
something that_should_ work. Haven't tried it yet but see no reason it would
not work powering the guages ( thermal type )in my Ford Ranger.
Radio Shack Adjustable Regulator
For a _negative_ ground system use 276-1778 $ 1.99 ( LM317T is the industry
# ) This regulates voltage on the _positive_ side of the rail.
For a _positive_ ground system use one that regulates on the _negitive_ side
of the rail. ( Sorry, don't have a PN and RS does not sell a adjustable one).
The Adjustable v regs use a minimum of 2 external parts, you could add a
capacitor on the input and output to smooth things out. But with a thermal
type gauge they might not be needed. There is a circuit on the back of the
Radio Shack package.
RS also sells fixed voltage regulators. They show a _negitive_ regulator (
use with a _positive_ground car ) that runs at a fixed 10 Volts. No external
parts are needed, three wires Power in, Ground, Power out. RSU 11513777 $
1.49 ( Special order, shipping might be extra.)
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