Restoring multiple speeds to your auto heater/air conditioner blower by replacing a resistor module is a simple repair.

Before today, we probably would have said that scratch-built relay computers were the sole domain of only the most wizardly of graybeards. But this impressive build sent in by [Will Dana] shows ...

[2] B.R. Williams, W.R. Schmus, D.C. Dawson, Transmission Voltage Recovery Delayed by Stalled Air Conditioner Compressors, IEEE PES Transactions on Power ... For ten years, he was employed by Beckwith ...