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Thread: 1500mA 5V Regulator Schematic

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    1500mA 5V Regulator Schematic

    I know this has been touched on before, but not for the 1.5 Amp requirement I am lookings for. I am intersted in building a cheap circuit to convert my car's 12V to 5V (1500mA). I know the 7805 regulator from Radio Shack will provide 5V but only at 1 amp. Could I use two of these in parallel? Could someone please hook me up with a simple schematic to build something to reach my goal?

    This is intended to power an external USB DVD Rom. Thanks

    Scott

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    Use an LM338K

    Michael
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    How would I go about wiring one of these? Can I buy it at Radio Shack or Frys??

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    Quote Originally Posted by spdyscotty
    Can I buy it at Radio Shack or Frys??
    No.

    Quote Originally Posted by spdyscotty
    How would I go about wiring one of these?
    Not that hard, needs a resistor, variable if you want to be able to change the output voltage, or fixed if you want to keep a steady voltage. You will also need a heatsink of some sort to deal with the heat dissipated. You should also use 2 capacitors.

    Other then that, it is pretty straight forward.

    Here is a basic wiring diagram. You should be able to use this with out a problem.

    http://casemods.pointofnoreturn.org/...rial-full.html

    Michael
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

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    You can also get 1.5A 7805s. Though maybe not at RadioShack.

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    Quote Originally Posted by mushin
    You can also get 1.5A 7805s. Though maybe not at RadioShack.
    7805s will work. However, since his need is 1.5 amps, it is better to use something that can handle more amperage. This reduces the heat dissipated, and also introduces a margin of error, in case he is actually drawing more amperage, or if there is amperage spike of some sort.

    Since the 338 can source 5 amps, he should be golden at 1.5, and running pretty cool. He probably won't need any forced cooling, and a small heatsink will probably be sufficient.

    But again, a 7805 will work. And I believe they are available at RatShack.

    Also, now that I think about it, Frys might have 338's. It is worth a trip to find out.

    Michael
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

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    To avoid the whole heat sink question I'd recomment a switching regulator. MAX724 or LT1074 would do the job. They are not particularly efficient at your load requirement (something like 80%) but still better than a linear regulator. You cannot buy those at RadioShack as far as I know, but you can order free samples from Maxim (www.maxim-ic.com) or Linear Technology (www.linear.com) and the circuit is rather simple, check out the datasheet at Linear since both parts are identical and Linear has more info on it.
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    The diagram linked above for an LM317. Same diagram? Also, where would I go about purchasing one of these if not at frys?

    I might give these switching regulators a look simply because they look easy to get.

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    Quote Originally Posted by spdyscotty
    The diagram linked above for an LM317. Same diagram? Also, where would I go about purchasing one of these if not at frys?

    I might give these switching regulators a look simply because they look easy to get.
    Totally don't know what diagram you are talking about, or purchasing of what? Sorry, can you rephrase that?
    I have found you an argument; I am not obliged to find you an understanding.

  10. #10
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    I was referring to the link provided in post #4 by Wiredwrx.

    But as for these switching regulators, is there a simple 5V diagram I can use?

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