Peter, Second thought, the MOSFET may need more gate voltage to turn it on fully. Typically, one needs 8 volts. The 5 volt logic MOSFETS may work.....have not tried it at this low voltage. David ----- Original Message ----- From: Peter Homann To: Sent: Sunday, May 30, 1999 5:20 PM Subject: Reverse Polarity Protection for 3V PIC Circuit. > Hi, > > I need to protect my PIC16LF84 against reverse polarity. Currently I'm > running the circuit of 2 x 1.5 N cells (2/3 AAA). I want to protect the > circuitry from the batteries being inserted the wrong way. > > I'm not keen to put a diode in series with the batteries as I'll loose 0.6V. > > Thanks, > > Peter. > --- > Peter Homann Email: peterh@adacel.com.au > Adacel Technologies Ltd _/_/_/ _/_/_/ _/ Phone: +61 3 9596 2991 > 250 Bay St, Brighton _/ _/ _/ _/ Fax: +61 3 9596 2960 > Victoria 3186 _/_/_/ _/ _/ Home: +61 3 9555 5603 > AUSTRALIA _/ _/ _/ _/_/_/Mobile: 0414-494578 > ------------------------------------------------------------------------ >