5.5V----->|---------+---PIC | 3.5V----->|---------+ This will drop your voltage a little (use Schotkys). Just an idea, maybe not what you meant. Gabriel ----Original Message----- From: Andy Kunz To: PICLIST@MITVMA.MIT.EDU Date: Wednesday, May 12, 1999 4:20 PM Subject: PIC select Vcc >I want to have a PIC switch it's power supply between 5.5V and 3.5V. Any >ideas? It needs to default to 5.5V on powerup. And it can only use 1 pin. > >I was thinking: > > 5.5V > | > | > -------------o > | | > \ | > /470 | > \ | > | 10 | >PIC--o---\/\/-- FET > | > | > | > Vcc to circuit > >This would work for the 5.5V supply. How do I do a 3.3V supply now? > >I'm using a FET because of the load I'm drawing. > >Thanks. > >Andy > >================================================================== > Montana Design Tech Support - http://www.montanadesign.com >==================================================================