John Waters wrote:
> I need to turn on and off a load that takes very little power (a few
> ma at 3V). I want all the power I supply to the circuit goes mostly
> to the load itself but not the switching device. I couldn't use a
> relay since the relay coil consumes too much power. I

Look up "transistor".  Both bipolar and FET could be appropriate depending
on details.  You also need to decide whether you can switch the high side,
low side, or either.  All else being equal, it's ususally easier to switch
the low side.


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