Enhanced Circuit Yields Versatile, Efficient Switch-Mode Solenoid/Relay Driver (.PDF Download)

Several years ago, Paul Rako, in collaboration with the late, great Bob Pease, wrote a terrific article about the finer theoretical and practical points of electromagnetic solenoid-driver circuits.1 It noted that most solenoids need less power to sustain actuation after the plunger is pulled in than is needed to actuate them in the first place. Important power saving and heat reduction without loss of mechanical performance are therefore possible if drive voltage starts out high

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