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Thread: Cheap 5v power regulator for my usb hub

  1. #21
    Low Bitrate madmartigan's Avatar
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    Scotty the shipping could be much worse, trust me.
    Dont tell me to shut up, I'm Rick James ******!!!

  2. #22
    Constant Bitrate
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    http://www.carnetix.com/P5V.htm

    A bit expensive but a very nice and compact little piece.

  3. #23
    Maximum Bitrate Ruffy's Avatar
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    Quote Originally Posted by psyrex View Post
    Well, from the schematic, the 7805 just sets the voltage, the 2n2955 is the power transistor that actually supplies the power. It handles 16A, so it'll be fine.

    bump with a question.

    The 7805 handles 1a

    Are you saying that with that diode the circuit is capable of pushing 16a. If so why does the carnetix POL say you MUST use a heatsink on the voltage regulator in order to get 3amps out of it.
    Car : 00' Chrysler 300M
    Speakers : Rainbow Audio SLC 265 | Subs : Diamond Audio D6 12" Subs X2
    Amp's : Hifonics ZXi 6006 AB | Hifonics BXi 1606 D
    CarPC: HP Laptop AMD Sempron 3000+ | 1.5GB RAM | DVD+RW | 80GB 5400RPM HD | ATI R200 Video

  4. #24
    Maximum Bitrate crooper's Avatar
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    How about one of those cigarette lighter USB power things, and hack it apart to cannibalize the innards?

  5. #25
    Low Bitrate festy's Avatar
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    Have a look at the LM2576T-5, it's a switchmode 5v regulator in a TO220 package for about $2.
    The NS datasheet has an example circuit for a 5v/3a regulated supply using about 5 components.
    The Maxim MAX787 is similar but rated for 5v/5a if you can find some old stock.

  6. #26
    Newbie nissanboy67's Avatar
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    i found a cheap way of doing th 5V thing, went to local Jaycar store and purchased a 5v 1.0amp cig plug with USB output plug, works just great and only cost $9.95 AUD

  7. #27
    Maximum Bitrate Ruffy's Avatar
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    Quote Originally Posted by nissanboy67 View Post
    i found a cheap way of doing th 5V thing, went to local Jaycar store and purchased a 5v 1.0amp cig plug with USB output plug, works just great and only cost $9.95 AUD
    1amp isnt enough, I want over 5a. I've only found one option and its 50 shipped
    Car : 00' Chrysler 300M
    Speakers : Rainbow Audio SLC 265 | Subs : Diamond Audio D6 12" Subs X2
    Amp's : Hifonics ZXi 6006 AB | Hifonics BXi 1606 D
    CarPC: HP Laptop AMD Sempron 3000+ | 1.5GB RAM | DVD+RW | 80GB 5400RPM HD | ATI R200 Video

  8. #28
    Maximum Bitrate Ruffy's Avatar
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    Quote Originally Posted by festy View Post
    Have a look at the LM2576T-5, it's a switchmode 5v regulator in a TO220 package for about $2.
    The NS datasheet has an example circuit for a 5v/3a regulated supply using about 5 components.
    The Maxim MAX787 is similar but rated for 5v/5a if you can find some old stock.

    i looked at the LM2576T-5, i believe its the same one carnetix uses. Want more power!

    The maxim is impossible to find. already tried
    Car : 00' Chrysler 300M
    Speakers : Rainbow Audio SLC 265 | Subs : Diamond Audio D6 12" Subs X2
    Amp's : Hifonics ZXi 6006 AB | Hifonics BXi 1606 D
    CarPC: HP Laptop AMD Sempron 3000+ | 1.5GB RAM | DVD+RW | 80GB 5400RPM HD | ATI R200 Video

  9. #29
    Maximum Bitrate Ruffy's Avatar
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    Currently Consideirng the LM2678

    there are other choices that push 5a at least
    http://www.futurlec.com/ICLinearRegulators.shtml

    dont know which to get or which circuit to use. but we'll see
    Car : 00' Chrysler 300M
    Speakers : Rainbow Audio SLC 265 | Subs : Diamond Audio D6 12" Subs X2
    Amp's : Hifonics ZXi 6006 AB | Hifonics BXi 1606 D
    CarPC: HP Laptop AMD Sempron 3000+ | 1.5GB RAM | DVD+RW | 80GB 5400RPM HD | ATI R200 Video

  10. #30
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    Quote Originally Posted by nissanboy67 View Post
    i found a cheap way of doing th 5V thing, went to local Jaycar store and purchased a 5v 1.0amp cig plug with USB output plug, works just great and only cost $9.95 AUD
    Do you guys know if I were to do it this way (opening up the USB cigarette adaptor and tapping the 5V DC), will it be able to withstand the surges during cranking and engine off?

    I was thinking of cutting off the original power supply to the cigarette adaptor port and tapping it to an 'always-on' 12V unregulated, fused supply from the car batt, then I'll use this USB cigarette adaptor to 'cushion' the spikes and surges.

    Will it be good enough?

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