Control Circuit2

122

01:57:05

Circuit that takes 120VAC @ 60Hz, converts to 15VDC through a diode bridge, and applies a voltage to a device (lamp) when the two potentiometers are not equal.

This is intended to be used as a temperature controller that could be plugged into household power. One potentiometer would be a Thermistor, the other would be the set point. When the ambient drops below the set point, a heating device (shown as a lamp) turns on. When the the ambient raises above the set point a cooling device (shown as another lamp) turns on.

published 9 years ago

rich11292000

9 years ago

The op amp can't put out that much amperage. Using a couple relays will help.

tayar

9 years ago

Tayar

BillyT

9 years ago

Theory is good, in practice, now days, for safety sake mains power supply is normally kept out of the control circuits. Transformers or power supplies are used to provide isolated low voltage to the control circuits, further isolation in outputs is achieved by control relays (mechanical or solid state) to drive the heating / cooling and circulation fans / vents circuits.

agiasson

9 years ago

Thanks for the insights, I was wondering about the safety of this circuit. It's been a long time since I studied any circuit design, and I'm just getting back into it. Back to the drawing board.

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