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Archive for March 9th, 2012

Peltier PWM Temperature Control: Thermistor Brick

Having figured out the dual-thermistor circuit, I made a small mold from cut-up credit card-ish things, laid down a layer of JB Weld epoxy, and positioned the thermistor assembly just above it:

Thermistor brick - mold layout

Thermistor brick - mold layout

A generous dollop of epoxy filled in the rest of the mold and it cured overnight:

Thermistor brick - curing

Thermistor brick - curing

Extract the final result, file off the rough edges, and then epoxy it to the thermal block:

MOSFET thermal block

MOSFET thermal block

And then it’s all good!

The thermal resistance from aluminum-to-thermistor seems to be no big deal compared with the thermal inertia of the block and Peltier module.

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