Peter Todd <pete <at> petertodd.ca> writes:


> Got a link to an explanation? I couldn't figure out what configuration
> to put them in for zero drain when I was playing around.

Use fixed font to view:

             PFET
batt+ --+--- S G D -----+--- Vsw
        |      |        |
        +-C1---+        |
               |        |
               |        |
               D        |
           NF  G--------+
               S        |
               |        C2
               |        |
               +--------+
               |
              GND

C1 prevents spurious switch on C2 is a filter cap on the switched side and
serves the same function for NFet as C1 for PFET does. The start switch bridges
the PFET DS. You can tie the gate of NFet to a microprocessor output (use a
pullup 10Meg). A bleeder resistor across Vsw and GND may be ncessary to achieve
reset (turn off).

Peter P.

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist