This energy saving, 12-V controller is nearly universally applicable. In addition to controlling battery powered lighting in a car, boat or caravan it is also quite able to control the speed of a model train. In essence, this circuit converts the 12-V DC voltage into a rectangular pulse train with a duty cycle that is adjustable from 0 to 100%. The circuit can be divided into four sub-circuits: the saw-tooth generator built around IC1, reference network P1/R3/C3, comparator IC2 and driver stage T1/T2. The comparator compares the generated sawtooth voltage (1) with the reference voltage (2).
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