Barry Gershenfeld wrote:

> >And the circuit is probably completed by the nice bright arc on your switch
> >contacts.
> >
> >Bob Ammerman
>
> Now we're getting somewhere!  I've puzzled about this long and hard.
> That energy HAS to go somewhere.  It starts by jumping the switch,
> as Bob pointed out.  But you can open a switch faster than the
> energy goes away.  Or you can use an electronic thingie.

Yep, it's called a diode across the motor. Or the
relay coil, or across anything inductive you are
switching on and off. Unless you are deliberately
building an ignition coil and spark plug! :o)
-Roman

PS. If you put your diode across the motor and
current sense resistor (them in series) the diode
will still allow PWM etc and the resistor will
still allow current sensing AVERAGE of the motor.
-Roman

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