Well, the main component of it is probably the microcontroller.
I've talked to Jeff about making a two-stage timer that sends an ATX power-button momentary pulse after the first timer and cuts off power after the second.
He thought it was something he could do, but I think he's real busy with those power supplies at the moment. :P
Player: Celeron II 633MHz, 256MB RAM, 20GB IBM 9mm 2.5" Laptop HD (180G/2ms), onboard ethernet/sound/video/tvout, 10"11"x3" case, MPBS1 70W DC-DC PS w/auto-shutdown controller, in-dash lighted switches, 7" NTSC TFT widescreen in-dash LCD, touchscreen, rear-window brake light installed Garmin GPS35 GPS, credit card sized IR remote w/IRMan, mini-wireless keyboard/mouse (sits under seat), PowerMate black knob, MP3s and GPS Navigation (Winamp, CoPilot, SA8.0).
Car: 1993 Nissan Maxima, Black Emerald
Hmm, you could also do something based on my circuit:
http://www.astron.nl/~smirnov/poweroff.html
Just cascade two of them (i.e. power output of the first circuit goes to Vacc of the second. The second circuit won't need a diode or a power-off button.) to get a two-stage timer. The only tricky part is actually generating the momentary pulse when the first timer fires. Let me think about it for a bit...
Custom Linux system on an '89 VW GTI 16V Edition One
Jogdial volume control, Sony joystick, IR remote...
Used to be the fastest Linux on the road, until all these NOS types came along...
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