Posted by Bob on January 31, 2010 at 21:02:27 from (69.178.228.68):
In Reply to: Re: Ballast resistor posted by Whiskey Bent on January 31, 2010 at 19:29:16:
Generally, the TRUE 12 Volt coils such as the IC14SB are simply wound with enough wire in the primary to work on 12 Volts, rather than having an INTERNAL resistor. (There MAY be exceptions, but I don't know of any.)
ANYHOW, a TRUE 12 Volt coil needs NO external ballast resistor.
So-called "12 Volt" coils that DO need an external resistor are generally marked "Use with external resistor". Of course, there exceptions to that, as well, and you need to know the part number and be able to look up "specs" or accurately measure the primary Ohms.
A 6 Volt coil or 12 Volt "use with external resistor" coil will generally have about 1.75 to 2.5 Ohms of primary resistance and a "true" 12 Volt coil will probably have 3.5 to 4.5 Ohms of primary resistance, or thereabouts.
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