Hi John,

Use a mosfet wiht low Rsdon at a gate voltage of  3V.
P channel is very easy to use.
Just connect the source to positive (3V), drain to your load
and gate to negative to turn on and off your load.

Best regards,

Rubens


At 20:15 13/8/2008, you wrote:

>Hi All,
>
>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 don't even 
>want to use a transistor as a switch, because when it is saturated, 
>there is a certain volt-drop across it, hence some power is lost in 
>the transistor. Is there any component (or methods) that could be 
>used as a switch and at the same time the power loss in the switch 
>itself is very low?
>
>Thanks in advance!
>John
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