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[Bob Cook]

Jim

There are a number of inexpensive 28-12v converters that consist of a heatsink and series regulator. The better ones have THERMAL Protection, Fused, fire protection and current limiting. Surge protection (internal) is important to avoid blowing std regulators (TO-3 case type).

I replaced the series resistor in the aircraft with a commercial unit and did a 337. This way the cig lighter is now a regulated 12v that can be used with any 12 appliance without worry. Not worth the time to build one and worry about construction!

Cost - around 25 dollars for a 8 amp unit. Heat sink can go on front firewall or over the glove box. Far safer than watching a 10W resistor glow red....

fyi

bob