All the information you need to build a simple Precision Temperature Controller - using a few cheap off-the-shelf components.
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Breadboard Layout Choosing Parts Testing Your Circuit More Thermostats Firefox Optimised

Constant Temperature Controller - Photograph

Free Circuit

Simulation

Circuit Board

This is a photograph of the Constant Temperature Controller. It works like an automatic dimmer switch. Every second - it makes one-hundred fine adjustments to the heater's output - in order to maintain a stable preset temperature.
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