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Thread: 2 LM7805's in Parallel

  1. 12-11-2005, 02:02 PM #1
    bruha
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    2 LM7805's in Parallel

    Is it possible to hook two LM7805 regulators up in parallel to give a +5V 2A supply (as opposed to a +5V 1A supply)?
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  2. 12-11-2005, 02:12 PM #2
    DJiK
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    Looks like they've done something similar here.
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  3. 12-11-2005, 02:14 PM #3
    agentloveless
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    Yes, hooked up in parallel they should give 2A. Be sure they sit far enough apart that both are allowed to disipate there heat.
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  4. 12-11-2005, 03:11 PM #4
    bruha
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    Quote Originally Posted by DJiK
    Looks like they've done something similar here.
    It looks like that is two separate regulators with two separate outputs.
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  5. 12-12-2005, 04:49 PM #5
    jcdillin
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    it won't work very well, most the time one of the regulators will try to take all the load and shutdown. Your much better off going with a switching regulator for a load that high. The carnetix POL works really really well in this situation and gives you 3A
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  6. 12-12-2005, 08:06 PM #6
    bruha
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    Quote Originally Posted by jcdillin
    it won't work very well, most the time one of the regulators will try to take all the load and shutdown. Your much better off going with a switching regulator for a load that high. The carnetix POL works really really well in this situation and gives you 3A
    Yeah thats what I figured. I just wanted a cheap alternative to the carnetix POL; since the LM's are only <$2.00 each.
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  7. 12-12-2005, 11:58 PM #7
    Fox_Mulder
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    You can use a TIP2955 Transistor to increase the current output.
    Eg: http://www.mitedu.freeserve.co.uk/Ci...er/1230psu.htm
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  8. 12-13-2005, 01:23 AM #8
    shotgunefx
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    Or just use a LM123 regulator. It's 5v 3amp regulator.
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  9. 12-13-2005, 03:01 PM #9
    bruha
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    Quote Originally Posted by shotgunefx
    Or just use a LM123 regulator. It's 5v 3amp regulator.
    Nice, the LM123 is essentially what I'm looking for. Do you know any cheap places to buy them?

    Thanks
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  10. 12-13-2005, 05:19 PM #10
    shotgunefx
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    Quote Originally Posted by bruha
    Nice, the LM123 is essentially what I'm looking for. Do you know any cheap places to buy them?

    Thanks
    I got mine at mouser, not sure what I payed for em.
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