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Pro/Car and Motorsports Forum For those geeks who dig Cars, Racing, or just aspire to some day drive one. |
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#26 |
Cooling Savant
Join Date: Mar 2001
Location: south FL
Posts: 220
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12 volt is mainly used for your drive motors, hard drive & cdrom.
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#27 | ||
Cooling Savant
Join Date: May 2003
Location: Okotoks, A.B. Canada
Posts: 726
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![]() Quote:
Quote:
is there anything that actualy uses it?
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#28 |
Cooling Savant
Join Date: Mar 2003
Location: MO
Posts: 781
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-12 was used by ISA sound cards, don't know of anything that still uses it. -5 is still used by serial ports.
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#29 | |
Cooling Savant
Join Date: May 2003
Location: Okotoks, A.B. Canada
Posts: 726
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and if you don't need the cerial port all you would need is 15.3 volts, +12 to -3.3
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"Great spirits have always encountered violent opposition from mediocre minds" - (Einstein) |
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#30 |
Cooling Savant
Join Date: Mar 2003
Location: MO
Posts: 781
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-3.3 ?? Never heard of that one.
Yup, you should be able to do it with just positive voltages for a legacy free board. And the center tap idea to get the negative voltages is overkill - easier and cheaper to use a small charge-pump to if you need the small amounts of negative voltages. |
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#31 |
Cooling Savant
Join Date: Mar 2003
Location: notts uk
Posts: 408
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i have an update on my car system. it's still work in progress and i think i am gong to change the pc but it all works.
7inch lilliput touchscreen haicom serial gps (same one from the hp system i used at the start of ths thread) HP E-PC e-vectra p2760a that work gave me to use on the project. This is a small form factor pc that uses a 19v dc power block and i use a laptop car power block that also gives me 19v at 5000ma the pc only needs 3160ma. The only thing i changed is the slim cd-rom for a dvd-rom. A customer at work made a blanking plate to go in place of my dual din car stereo and i used velcro to attach the screen to it so i can remove it. as the dash is silver and the screen is too it looks ok. For mouse if i need it i use a shuttle remote that came with my SFF XPC. It's running xp with mediacar as an interface. Navigator gps software which is not the best but was only £35 and gives full voice navigation. Media car works with a dlnk usb radio but i had trouble getting one so i used a wintv usb. This will also let me use the tv capture for rear parking camera or watching tv. I had to use radiator to get the wintv usb radio working in media car. The last part was audio and i have a small 4x30w or 2x60w amp. Now this all works apart from loads of engine noise on the audio side. I dont know if it's from the power to the pc or the amp it's self but i have very little time at the moment. I am still thinking of getting a via itx board and the opus psu instead of the hp e-pc. The itx board will fit inside the dual stereo's old home to make a very tidy installation.
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#32 |
Cooling Savant
Join Date: Mar 2001
Location: south FL
Posts: 220
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hey leejsmith, I also had alot of problems at first with noise, if you use a walkman instead of your pc you can see if its in your amps or the pc. I had some of both" alt noise and harddrive/ cdrom noise" , I ran 4 gage wire to the rear where my amps are "about 1500 watts
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#33 |
Responsible for 2%
of all the posts here. Join Date: May 2002
Location: Texas, U.S.A.
Posts: 8,302
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Putting a PC in a car is an idea I've toyed with for years, but I could never get passed the power issue.
How do you do it? Do you have to add an alternator and/or battery? |
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#34 | |
Cooling Savant
Join Date: Mar 2003
Location: notts uk
Posts: 408
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thanks for the sound tips. I was thinking of using a sound proccessor from the pc digital output but it might be a little over my budget. the usb soundblaster is a good idea. i dont think the amp i used to test is very good that could be my problem but i will test it with a walkman to see.
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#35 |
Cooling Savant
Join Date: Mar 2001
Location: south FL
Posts: 220
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ya the soundblaster mp3 is only abot $40 not bad at all.
To bigben: we use pc's that are dc micro atx, others do still go about it the hard way using inverters to power full size atx mobo, check my site to see some specs " we dont sell to the puplic yet still prototyping more software and hardware" http://hybrid-mobile.com |
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#36 |
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Location: Texas, U.S.A.
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Yeah, an inverter is a no-no: it's just too inefficient. A microATX would be ideal, I was considering the same, even one using the Epia processor, if necessary.
But how do you power it? If you use a direct line to the battery, you'll have maybe 14 volts, with a lot of bad nasty noise. |
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#37 |
Cooling Neophyte
Join Date: Dec 2003
Location: Ohio
Posts: 19
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USB and ethernet use -12V for something. I know they used to anyway. It's just a signal, ntohing big though.
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