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 Since: June 26, 2010

Country: United States

  • Help! I connected the optoisolator to a ringer detection circuit which puts 2.3V across the input, but it doesn’t switch. HV line is 5V. Are these values too small?

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