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    Outside Air Exchange Control

    Outside Air Exchange Control

    This tool demonstrates the use of two thermostats to provide a control system for an air exchange fan that draws cold outside air in to cool a storage room for winter crops. The control essentially provides a differential temperature control which may also be applicable to other processes (curing, solar hot water, etc.)

    Inexpensive Variable Speed Control Using a Light Dimmer Switch

    Inexpensive Variable Speed Control Using a Light Dimmer Switch

    This tool uses a modern light dimming switch to provide variable speed control of a motor (fan, pump, etc.) It turns out these dimmers use silicon controlled rectifiers (SCR's) which allow for very nice voltage control, and hence speed control in motors common to farm applications. More on SCR here: https://www.quora.com/What-is-the-difference-between-the-SCR-and-a-voltage-regulator.