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12VDC/2A power adapter to power two systems?

  1. Feb 4, 2017 #1

    perplexabot

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    Hey!
    So I have a raspberry pi that uses 5V/1.2A and a LCD monitor that uses 12v/0.2A. I would like to power both using a single wall power outlet. I found a power adapter that converts 100-240VAC/50-60Hz/1.2A to 12VDC/2A.

    I was wondering if it is as easy as cutting off the connector on the other side of the adapter, and using the +12/-12 wires to power the LCD (which I'm sure would work), then I would also tap the +12/-12 wires to a LM317T so that it outputs a regulated voltage of 5V (to the pi).

    Will this work?

    Thanks.
     
  2. jcsd
  3. Feb 4, 2017 #2

    davenn

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    yup .... ensure the 317 is well heat sunk ... it's going to dissipate a lot of watts of heat
    namely 7 x 1.2A = 8.4W

    edit .... also note that @ 1.2A that is right near the max for the LM317 .... best to use the TO3 case not the TO220 case version
     
  4. Feb 4, 2017 #3

    perplexabot

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    Thank you for the quick reply! Great to hear it is that simple! Unfortunately now I have to solder together a new circuit for the TO3 instead of using an older circuit i had with the TO220.

    Oh well, shouldn't be too bad. Thanks again.

    EDIT: DAMN! Those TO3's are 40 bucks on digikey!
     
  5. Feb 4, 2017 #4

    davenn

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