Member Since: December 21, 2010

Country: United States

  • For those wishing to use a lower voltage signal to energize the coil (e.g. 3.3v as per a few comments) change the resistor network feeding the transistor base so that it provides more current - though be sure to limit the current to something your signal can source. There is a good writeup of the calculations here: If you are switching this thing with something sensitive you might think about swapping out the transistor with an optoisolator e.g.

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