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Thread: newbie seeking help

  1. #1
    Newbie
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    Jul 2002
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    Australia
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    Unhappy newbie seeking help

    Im a uni student over the other side of the planet to u guys (the good old land down under) and am looking to do a mp3 player on the cheap.

    I cant afford to have it stuff up the car or draw heaps of power as I only own an old reliable KE30 corolla so the battery dies quick. I know this kind of car doesnt seem worth the effort but it needs to last me the (very long) time until I can afford something better. Plus i had the computer lying there doin nothing.

    Anyway to the point...

    I found this site by a guy in Australia for a DIY DC to DC power supply. http://www.bettanet.net.au/gtd/mp3.htm I was wondering if someone could take a look at the plans for the design (just the power supply) and tell me if...

    Is it any good
    Could it damage the computer or car in anyway (ie could a voltage spike knock something out which then blows something else...)
    Is there a cheaper and better way?
    (note our dollar is worth about .50c American)
    (bearing in mind i live in australia so dont say buy a product from this store as postage would be a bundle)

    my electrics knowledge is fairly limited and so are my tools.

    thanks
    one confused guy

  2. #2
    Banned
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    Hello Fellow Aussie, I was looking for that site, thanx, not for teh supply, but because I had a printout, and some pages were missing, I was interested in teh buttons interface... Ahh, that powersupply.. hmm... It uses linear regulators.... waht system are you planning on running?? linear regs are too hot.. That circuit will only give 2 amps on teh 5volt rail, and 1 amp on teh 12volt..... won't it??? How did he run a Cyrix 333 off it then?? hmm... I think he REALLY should redraw his schematics.. lol well, if your on a budget, your best bet would probably be an inverter.... or, linear regs, but not many people have had any sucsess. . I am also on a budget, and could probably knock up a basic MP3 system for free..
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  3. #3
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    Wha!!!! that guy says his entire system only draws 1.8amps @ 5volts and 1amp @ 12volts, including a 4.3gig HD spun up.. :P ahh, is this right??? isn't that one SUPER CPU or what??? My P200MMX and mobo suck about 5amps @ 5volts.. :P WOW!!!
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  4. #4
    Low Bitrate
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    How does a power supply that will give bout 10A on the 3.3 and 5 and bout 4A on the 12....... for the cost of solder, board, and cap's???

    Hopefully my site will be up in the next week or two showing DIY... parts arriving monday to begin my build.

    Cyrix processors are VERY low power in comparison to Intels. It would seem Intel could do with having an electricity bill budget, not just on for their coffee.
    C@sper - Layer-3 Project

  5. #5
    FLAC MP3DUB's Avatar
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    New cryrix's are designed to be low power and cool running (c3), but the originally cyrix's (ah the days of the pr) were more power hungry than equivalent intel chips, and ran hotter.
    -Nick

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  6. #6
    Variable Bitrate
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    What a load of crap!!! Im running that exact Cyrix chip (see my sig) and I have to use TWO Maxim switch modes giving 10amp AND 3 5v linear regs bringing the total up to 13amp, and its literally on the limit. If I try and put anything extra on the 5v line everything shuts down in seconds.
    -------------------------------------------
    (=========-) 99% complete
    --------------------------------------------
    AMD K6/2 500 @ 450mhz to keep heat and power usage down, 64Mb, slim CDrom drive, 64mb USB pendrive for MP3 transfer, 10Gb 2.5" drive for MP3, USB>RS232
    All jammed in external CDROM drive case.
    Kenwood KVC-1000r In-Dash LCD. x-10 MouseRemote. Destinator V2 Gps. DC-DC with onboard Shutdown controller.
    ----------------------------------------------

  7. #7
    FLAC MP3DUB's Avatar
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    The only way i could think of to pull off amp's that low would be to use a c3 (modern cool, low powered cyrix), and underclock it even further.
    -Nick

    _____________________________
    Since when is insanity a bad thing?
    Monthly MP3Car Chicago Meets
    www.mp3vw.com Last updated: 07/07/2008

  8. #8
    Low Bitrate
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    ur 333 processor is using 65w of power? are you sure that its your processor, not peripherals like hdd's cd-roms???
    C@sper - Layer-3 Project

  9. #9
    Variable Bitrate
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    My HDD draws 0.45amp on 5v and 0.60amp at 12v ( I have measured this). I do not use a CD Rom drive, the only peripherals are sound card, video card, and GPS antenna. Replacing the Cyrix with a celery drops the current draw right down. Trust me, its the Cyrix. It gets VERY hot, they always do.
    -------------------------------------------
    (=========-) 99% complete
    --------------------------------------------
    AMD K6/2 500 @ 450mhz to keep heat and power usage down, 64Mb, slim CDrom drive, 64mb USB pendrive for MP3 transfer, 10Gb 2.5" drive for MP3, USB>RS232
    All jammed in external CDROM drive case.
    Kenwood KVC-1000r In-Dash LCD. x-10 MouseRemote. Destinator V2 Gps. DC-DC with onboard Shutdown controller.
    ----------------------------------------------

  10. #10
    Banned
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    boy, I got that nice and off topic nice and quick.. lol
    2 week temp ban (spam and complaining about deleted posts)
    register another account and you're gone for good.

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