HOW TO – Make an Op-Amp hot tub temperature controller

Technology
HOW TO – Make an Op-Amp hot tub temperature controller

Pcb-1Jake writes “When the temperature controller on my $50 garage-sale hot tub failed I balked at springing for another electro-mechanical thermostat so I built this one using junk box parts with the help of that classic: The Engineer’s Mini Notebook – Op-Amp Projects from Radio Shack.” Link.

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