Member Since: December 29, 2006

Country: United States

  • I generally prefer the polarized connector approach for minimum cost. But using a MOSFET like the following link is best when the device is powered by replaceable batteries.(unless the battery contacts are mechanically polarized.) If you can’t afford the diode drop of option one, the fet is a great solution.
    Power supplies using a Li coin cell or just one or two AAA cells will really benefit from this trick. I am partial to the IRLML2502 in this circuit because of it’s low cost, Rds, Vgs, and high drain current limit.

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