DIY Car Electronic Modification Sourcebook: ...for everyone interested in electronically modifying their car

I had fitted an electric engine fan and needed to control it. I used the circuit described in the book. Not only did I get a much better controller than the standard one from the auto shop I also have a dashboard digital read out, precision set point control plus other hysteresis controls from the dashboard . The total cost of everything including the book came to less than the cost of a standard auto shop controller.