A.1 is an input to the PIC so it can read the switch state.

To turn power off, set A.0 low.


At 09:46 PM 6/11/2007, you wrote:
>Hi all,
>I need to ask for help on something cause I obviously don't know what I'm
>doing ;-)
>
>I took this circuit here:
>http://www.pic101.com/pushpush.gif
>And I replaced the pass transistor with a P channel FET.  I can get it to
>turn on and latch with taking the pic pin A0 high, However I can't turn it
>off by getting 5V on pin A1.  I put a 10K resistor on the A1 line to 5V but
>don't get a high.  I tried it with the 4.7K from collector to Gate as shown
>and without.  I tried a 1Mohm resistor from Gate to Source in place of the
>10K.  No difference in any case.  I can't see a 5V signal at A1.  Help with
>what I'm doing wrong is greatly appreciated.
>Thanks,
>FJ
>
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