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Glen, before I go mad with the soldering iron, I was wondering about the PWM's role in this system.
I can understand that by reducing the voltage being supplied to the TEC you can exercise some control over the aggressiveness of the cooling. But isn't that what the Temperature Controller does anyway? Is the PWM necessarily adding anything to it? In a mobile rig, I appreciate that power saved is a good thing. But in a permanent installation, where 24o AC is available, it's not generally an issue.
And as a side issue, do you plan on placing the PWM between the temp controller and the TEC or between the 12VDC source and the temp controller. The reason for the question stems from my temp controller having a separate outlet sending power to the TEC fans. I wouldn't think it a good idea to run those fans too far below their nominal 12VDC input levels.
Peter
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