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12-28-2003, 12:02 PM
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#1
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Low Bitrate
Join Date: Oct 2003
Location: Philly, PA
Posts: 59
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does anyone have a shutdown controller design they can share?
I want to build my own shutdown controller, does anyone have any schematics for one?
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Pontiac Grand Am
building CarPC useing BookPC and Lilliput 7 inch TS.
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12-28-2003, 05:30 PM
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#2
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FLAC
Join Date: Nov 2003
Location: Marietta, GA
Posts: 1,113
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Check out page 14 of this
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MikeH
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12-28-2003, 05:53 PM
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#3
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Constant Bitrate
Join Date: Nov 2003
Location: France
Posts: 139
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Thank you very much for your link,it is a MUST read for all with Epia Mini-Itw motherboards 
Quote: Originally Posted by MikeH
Check out page 14 of this
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01-01-2004, 02:07 PM
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#4
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Low Bitrate
Join Date: Oct 2003
Location: Philly, PA
Posts: 59
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is that just a shutdown controller? or also a tank circuit?
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Pontiac Grand Am
building CarPC useing BookPC and Lilliput 7 inch TS.
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01-01-2004, 02:20 PM
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#5
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FLAC
Join Date: Nov 2003
Location: Marietta, GA
Posts: 1,113
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DJ
Quote:
is that just a shutdown controller? or also a tank circuit?
Are you referring to the ITPS? It is a turn-on/shoutdown controller plus a (somewhat unusable) 12V regulator. As I understand, a "tank circuit" usually consists of a diode feeding a large capacitor, which attempts to hold enough charge to continue feeding 12v to you carpc during engine cranking. The ITPS DOES NOT do this. However, they have recommended the following as a way to help overcome the crank issue. This approach should work much better than a capacitor:
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MikeH
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01-01-2004, 08:39 PM
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#6
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Raw Wave
Join Date: Jun 2003
Location: London UK
Posts: 1,818
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MikeH,
Some has already tried this solution, and surprised the ITPS barely work. This is due to the fact that the ITPS already need 13.3V atleast to output a regulated 12V, loosing another 0.6V throught the diode make the matter worst.
The battery symbol is drawn funny 
Last edited by Ricky327; 01-02-2004 at 12:46 AM.
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01-04-2004, 02:49 PM
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#7
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Low Bitrate
Join Date: Oct 2003
Location: Philly, PA
Posts: 59
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i just want a design simmilar to jeffs...
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Pontiac Grand Am
building CarPC useing BookPC and Lilliput 7 inch TS.
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01-05-2004, 04:24 PM
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#8
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FLAC
Join Date: Nov 2003
Location: Marietta, GA
Posts: 1,113
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Ricky
Quote:
Some has already tried this solution, and surprised the ITPS barely work. This is due to the fact that the ITPS already need 13.3V atleast to output a regulated 12V, loosing another 0.6V throught the diode make the matter worst
Agreed, but I have bypassed the onboard 12v regulator. I'm using the laptop (Radio Shack) regulator before going into the ITPS. Therefore, there should only be a .1v drop across the switching FET on the ITPS. If my backup battery is fully charged, I should be able to get 11.3v+ or so (marginal, but should keep the mobo from rebooting) at the output of the ITPS during cranking. Obviously, I haven't tried it yet, so I'll let you know how it works when I do.
Quote:
The battery symbol is drawn funny
Yeah, looks funny to me too. It should have more cells...looks like an asymmetrical capacitor.
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MikeH
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01-12-2004, 05:10 PM
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#9
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Low Bitrate
Join Date: Oct 2003
Location: Philly, PA
Posts: 59
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all i wanna do is build a fairly simple shutdown controller.
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Pontiac Grand Am
building CarPC useing BookPC and Lilliput 7 inch TS.
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01-14-2004, 05:01 AM
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#10
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FLAC
Join Date: Jul 2000
Posts: 1,017
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Check out my "old" mp3car project page. In the hardware section you should see Jeff's shutdown controller (original) which I built a first working prototype of and its schematic.
http://home.comcast.net/~danielsoh/shutdown.htm
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01-15-2004, 12:48 PM
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#11
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Low Bitrate
Join Date: Oct 2003
Location: Philly, PA
Posts: 59
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thanks alot, exactly what i was looking for. I got one question, i tried to add the "2N3904-ND NPN SML SIG G.P. AMP&SWITCH TO92" to my shopping cart on digikey and they dont have that exact product. Which one of these would be the best substiute? http://www.digikey.com/scripts/DkSea...S&Cat=30999646
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Pontiac Grand Am
building CarPC useing BookPC and Lilliput 7 inch TS.
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01-15-2004, 01:12 PM
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#12
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FLAC
Join Date: Jul 2000
Posts: 1,017
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01-15-2004, 03:05 PM
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#13
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Raw Wave
Join Date: Jun 2003
Location: London UK
Posts: 1,818
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MikeH,
No I meant it was drawn upside down 
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01-17-2004, 04:39 PM
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#14
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Low Bitrate
Join Date: Oct 2003
Location: Philly, PA
Posts: 59
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got recommendation for a good bread board for it?
__________________
Pontiac Grand Am
building CarPC useing BookPC and Lilliput 7 inch TS.
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01-17-2004, 08:46 PM
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#15
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Constant Bitrate
Join Date: Dec 2002
Location: Netherlands
Posts: 172
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Quote: Originally Posted by Ricky327
MikeH,
No I meant it was drawn upside down
Exactly, this way of connecting stuff might give the carpc a typical R2D2 response. Whhheeeeee... and emit some smoke 
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white bream working on a trilogy: CARGO - UNIGO - MERGO
CARGO = the Car Computer
Intel Celeron M, [P]SDC, uBlox GPS, GPRS, WLAN, Silabs FM, RDS, TMC,
Dual-audio, Onecable TFT, Microsize: 45 x 108 x 168mm (1.8 x 4.3 x 6.6")
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