> > My car MP3 player was built on a standard Pentium 100 mobo with a > > soundblaster card. I built my own 12V AT-style PSU. > > Mmmmm 12 V power supply mmmmm > > How do you deal with variable output from the supply? What about > powering off - how does the machine shutdown gracefully?
The supply is regulated, so you only have to worry about variable output from the car's electrical system, except you don't because the output is regulated. I built my PSU to a design by Bob Blick (www.bobblick.com). It shuts down gracefully by having a PIC (permanently powered) monitoring the ignition. When the ignition goes off the PIC sends "!" to the serial port for 30s, and the PC starts shutting down the first time it sees the "!" character. After 30s the PIC assumes the PC has shut down gracefully and cuts the power. > We Want Details! Anytime. > Build a web page and put it on the OSTC server? Or I'll host it if you > want. Sure, I have the majority of the web pages I used to have, and pictures. I brought the box to a CLUG meeting and had a bunch of people look at it and nod sagely. Mail me off list if you're really interested. Thanks, Andy
