This circuit takes benefit of the voltage drop across bridge rectifier diodes to provide a 5-position variable voltage supply to a DC fan or other small DC motor. It is not as environment friendly as a change-mode circuit but it has the advantages of simplicity and no swaping hash. The 4 full-wave bridges are linked so that every has two pairs of sequence diodes in parallel, giving a voltage drop of about 1.4V, relying on the burden present.
Circuit diagram:
DC Motor Speed Controller Circuit Diagram
The rotary swap should have \"make before break\" contacts which will have to be rated to take presents as a lot as about an amp or so. For better currents, better rated bridge rectifiers and a suitably rugged rotary swap (or solenoids) will most definitely be required. If you want to have smaller voltage steps, that you must use the commoned AC inputs on the bridge rectifiers to provide intermediate steps on the velocity swap.
Author: Stephen Butcher,
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