Re: [CAD_CAM_EDM_DRO] Re: err/res circuit(updated picture)

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>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "cnchomeman"
><cnchomeman@y...> wrote:
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>>here is the new picture of what I want to do.
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>>http://www.e-zflight.com/files/ncnczi.jpg
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You have +5 V going through a relay contact and then to the base of an
NPN transistor. You need to put a series resistor (say, 10 K Ohms) in
series with the wire to the base, or it will draw lots of current and
destroy the transistor (and possibly the drive, too).

Jon