Author - James Stewart Campbell

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James Stewart Campbell	Write for Electronic Design
James Stewart Campbell, medical design consultant, received a BSEE from Lehigh University, Bethlehem, Pa., and an MD from Albany Medical College, N.Y. Email address: jimcampbell@ieee.org
1 results found for James Stewart Campbell, displaying items 1 - 1

March 16, 2006 [Ideas For Design]
Tiny Circuit Saves Big On Relay Power
Designers frequently use special circuits to reduce the power required to hold a relay in the latched position. Analog circuits such as the "brute force" resistor-capacitor solution or the time-variable current sink tend to be very bulky or waste energy in the pass-transistor. The simple and small digital circuit shown in the figure energizes a relay coil at full power for the time required for reliable latch. It then automatically reduces the coil current by 50% to maintain the...