I used a piezo tranducer between PA0 and GND on a PIC84 with no apparent
ill-effects.  I don't think you should have any problems with the transducer
between two pins.

Andy
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Andrew M Errington                               Tel: +44 1524 593678
Microcomputer Consultant                         Fax: +44 1524 844011
Lancaster University                      a.errington@lancaster.ac.uk
Lancaster LA1 4YW     http://www.lancs.ac.uk/people/cpaame/cpaame.htm
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>I want to connect a Piezo-disk across two output pins of either a
>pic84/pic71 and drive it directly by toggling the pins, ie pa0=1,pa1=0
>pa0=0,pa1=1,,,pa0=1,pa1=0. can anbody see a problem with capacitance.
>Would it be necessary to put a load resistor across the transducer..?
>The 84/71 will be driven from a 2.5-3v psu.
>Its function is to beep on a key press and use minimum power.
>comercial dc units use more power than I have to spare.