Don Latham wrote:
hello the group:
I've just installed a new "mercury-free" thermostat in my shop. I looked
the thing over and realized it has everything needed to control a
"constant temperature" enclosure. There's a diode used as temp sensor,easy
to remote with two wires, a place to put two AA batteries, a pot to adjust
the set temperature, all needed circuitry for a bang-bang controller with
1deg F hysteresis, uses a latching relay so the batteries last a long
time, a low battery indicator, and an easily backengineered circuit board,
and a low price. There is provision for external power as well. The one I
bought is a rite-temp model 6005; distributed by home despot. And it's
relatively cheap, about 20 devalued rasbuckniks. All that's required is
whatever needed for a heater and its power supply. Unfortunately, not for
110 volts but I didn't look at the relay to get the capability; that may
be a lawyer problem rather than a capacity problem.
Don
probably runs on 24VAC... a "doorbell transformer" is what you need.
They're current limited. Then, a couple 12V lightbulbs or a suitable
resistor as a load.
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