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Source for regulator/buck used in J1Sys Boards

Discussion in 'EthConGateway by Joshua 1 Systems' started by Wolfie, Dec 17, 2015.

  1. Wolfie

    Wolfie Full Time Elf

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    Does anyone have a line on where to buy the 5v regulator/buck that he uses on most of his boards?

    Its this little beastie I am looking for:
    [attachimg=1]

    No, I didn't burn one. I want more for some other projects to I derive 5v from 12v pixel feeds.
     

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  2. David_AVD

    David_AVD Bite my shiny metal ass!

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    You can get them from Digikey or Mouser (both in the USA). Part number is OKI-78SR-5/1.5-W36-C
     
  3. pagrosse

    pagrosse New Elf

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    You can also get 3amp ones a bit larger in size for around a 1$ each on eBay shipped. Search for buck converter. I use them on my 5v pixels. Plus u can sent them to any voltage. I set mine at 5.5-5.7v
     
  4. David_AVD

    David_AVD Bite my shiny metal ass!

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    Just remember that the eBay DC-DC converters often use counterfeit parts and often fail to meet the claimed specs.

    That said, I sometimes use them for non-critical applications and never near their rated max specs.
     
  5. OP
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    Wolfie

    Wolfie Full Time Elf

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    Thank you for the part #s! I will hit mauser tomorrow.

    I want them to power Max485 chips so I don't have to send 12v and 5v as well as the twisted data pair down the wire to the pixels. Almost no current so the tiny ones will suffice. I won't be driving pixels with them if thats what yall were thinking.
     
  6. David_AVD

    David_AVD Bite my shiny metal ass!

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    You could use a standard 7805T regulator with a couple of capacitors instead of the OKI if you're only powering the MAX chip.
     
  7. OP
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    Wolfie

    Wolfie Full Time Elf

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    Aren't they fairly inefficient compared to these buck types? I don't want to waste pixel power on inefficient regulators that turn 12v into heat.
     
  8. multicast

    multicast Senior Elf Generous Elf

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    you said it was tiny current. So the amount of power you are talking about wasting is going to be small.
     
  9. OP
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    Wolfie

    Wolfie Full Time Elf

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    Yes. But I thought they wasted quite a bit of power doing what they do, even for low current applications. Typical use also requires (or at least recommends) use of filter caps which makes its footprint actually physically larger than the tiny buck converter.

    So the buck consumes less power, makes less heat, and is smaller.

    These are going to be used away from a PSU at the end of a cable run. I don't want to loose any more pixel power than I have to which is why I was looking for the buck.
     
  10. multicast

    multicast Senior Elf Generous Elf

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  11. OP
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    Wolfie

    Wolfie Full Time Elf

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    It is linear isn't it. Doh! I think it still takes more space with the extra caps than the buck.
     

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