> -----Original Message----- > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf > Of Vasile Surducan > Sent: 27 September 2006 04:56 > To: Microcontroller discussion list - Public. > Subject: Re: [EE] I need a circuit for a bidirectional > optoisolatedTTLinterface > > > On 9/26/06, Roy wrote: > > To through a bit more light on my goal :-) > > I think the biggest light is to forget it and program the stuff from a > laptop running only from battery as long the jtag is connected. personally i wouldn't wan't to use a laptop whoose ground bus was tied to a nasty voltage (which is i guess the reason for wanting the isolation). you don't seem to have given any details on why your doing this but one option might be to use a floating output isolation transformer to power your device from during development work (thus allowing you to tie the logic ground of your target to mains ground without breaking anything). -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist