At 06:50 PM 01/24/08, you wrote:
>I've been searching for a very simple circuit that could turn on a,
>maybe, 10 watt resistor at 12 volts, when the temperature drops to
>perhaps 30F or so. Anyone have a reliable favorite?
>
>Laryn K8TVZ
Use a simple heating thermostat, available at Home Depot. Have it
key a 12v relay, the contacts handle the load current.
The auto junkyards have gobs of 12v relays, available for pennies...
grab one designed to run a heater fan ,they have 20amp contacts and
100-200ma coils).
Mike WA6ILQ