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SparkFun will be closed May 25, 2015 for Memorial Day. Orders placed after 2pm on Friday the 22nd will ship out on Tuesday. Thanks!

Member #144536

Member Since: July 29, 2010

Country: United States

  • An important point for power relay drive. Supressing the coil flyback with a freewheeling diode D1, is a poor practice. This prevents the relay from being able to open as entusiastically as it should. Ideally the circuit would use a zener in series with D1 (to limit the flyback to maybe 2x the rail voltage) and appropriate protection for the LED. Along the lines of http://relays.te.com/appnotes/app_pdfs/13c3311.pdf

  • An important point for power relay drive. Supressing the coil flyback with a freewheeling diode D1, is a poor practice. This prevents the relay from being able to open as entusiastically as it should. Ideally the circuit would use a zener in series with D1 (to limit the flyback to maybe 2x the rail voltage) and appropriate protection for the LED. Along the lines of http://relays.te.com/appnotes/app_pdfs/13c3311.pdf

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