Brian,
    Yes, It is possible that this and several other modifications can make
this circuit operate at lower voltages. However you will loose the ability,
for the user to turn off the device. Taking out the resister from the
collector of the transistor, and changing the values of the resisters will
not allow the port B pin from the switch to give feed back to the
microcontroller. If you want the microcontroller to be the only one to make
the decision to turn it off you could operate down to the gate turn on
voltage of about 2V.

Gordon Varney


> In response to "Gordon Varney (personal)" <varney@CLAS.NET>:
>
> Wouldn't this change make it work better at lower voltages?
>
> See attached GIF file.
>
> Also note how much smaller a GIF is for a diagram like this compared to
the
> size your JPG was.
>
> Brian Gregory.
> bg@catlover.com
>
>
>


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