1. MrCokeacola

    OP MrCokeacola Xbox Connoisseur
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    Using a GDEMU in a dreamcast and having trouble with the PSU getting hot and having to keep aligning the pins too as they keep going misaligned.

    As I'm too cheap to go with the obvious choice a Pico PSU I decided to use some resistors instead pictured below.
    IMG_20200216_021757.jpg

    The thing is the resistors get very hot and one touched the case and even melted it! I've since arranged them better so they don't hit the top of the case but it does seem like things are still getting really really hot.
    IMG_20200216_021809.jpg

    Should I be afraid of the heat the dreamcast is making or ride it out until the PSU goes kaput then finally mosey up the cash for a Pico? Also any other ideas to keep the system cool?
     
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  2. Jokey_Carrot

    Jokey_Carrot ̶g̶b̶a̶t̶e̶m̶p̶ Heroin Addict
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    That's an electrical fire waiting to happen.
     
  3. MrCokeacola

    OP MrCokeacola Xbox Connoisseur
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    Not really, the resistors and just metal and carbon so if they go nothing will really happen (in theory). Also all they are doing is being connected to the 12V rail (which is used for the disc drive) and feeding that power to ground (so everything is grounded which is also good). Using resistors is recommended when using a GDEMU to reduce heat, but it does not seem to be working. :/
     
  4. subcon959

    subcon959 teh retro
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    You could remove the voltage regulator to get rid of the 12V altogether.
     
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  5. MrCokeacola

    OP MrCokeacola Xbox Connoisseur
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    That is an idea, do you happen to know of any tutorials for doing that?
     
  6. subcon959

    subcon959 teh retro
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    Last edited by subcon959, Feb 16, 2020
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  7. koffieleut

    koffieleut GBAtemp Advanced Fan
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    Isn't the 12V for rgb scart? Can't remember that it's for the discdrive. I installed a Pico psu and connected the 12V.
     
  8. alexander1970

    alexander1970 Austrian Guy - allowed make grammatical Errors
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    Hello.:)

    I use the same MOD like you

    P1360294.JPG P1360295.JPG

    but the Resistors getting warm to really warm but not soo hot.:huh:

    Your PSU looks different from mine.
    Because of NTSC/PAL Dreamcast ??
     
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  9. MrCokeacola

    OP MrCokeacola Xbox Connoisseur
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    Interesting, so after running your Dreamcast for about 45 minutes to an hour your resistors don't get very hot? (I mean I can still touch them but they pretty hot) Also yes the North American Dreamcast has a totally different PSU that has the pins touching the other side.
     
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  10. alexander1970

    alexander1970 Austrian Guy - allowed make grammatical Errors
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    Yes I tested it before (about an Hour) and they get a bit more then warm.Not really hot.
    The Upper Housing Cover gets also warm on the Spot above where the Resistors are located.

    The Air which is blown out from the Fan is warm.Not hot.
    The Bottom of the Dreamcast gets also warm.
    But not really hot.:)
     
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  11. subcon959

    subcon959 teh retro
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    It could also be related to different versions of PSU and different regions (110V or 220V). I have a UK PAL DC (240V) and it doesn't get very hot at all so I didn't even need to use the resistors. I did put a second fan in the back as an intake just because I had a spare one.
     
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