• on Miscellaneous Electronics
  • Published in issue 3/2006 on page 0
About the article

Energy Recovery

Design Tip

If a relay is driven by a transistor switching stage it is usual to connect a flywheel diode in parallel with the coil to short out the back EMF produced when the relay current is switched off. If an LED is wired in series with the flywheel diode it will flash every time there is an inductive spike with the transistor turns off.
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