I need someone to explain this to me.

Handy Bench PSU’s


I thought everyone was going with cheap PC based power supplies(I did), but some people just have to take it to another level. [andrew] built this bench PSU with -12V, -15V, +5V, +12V, +15V, variable and one +35VDC unregulated output. He based it on this design, but added a few tweaks of his own.
Yes, Hack-A-Day took a bit of an unplanned hiatus on Saturday, but I’ll have some extra stuff for you this week as things return to normal. If you’ve got something interesting, use the tips line.

Comments

  1. nOObY says:

    Could you please add a mirror / cache for that?
    It runs on a home server and is not aviable for now.

    Thanks anyway for the great post,
    nOObY

  2. PsyKotyk says:

    I thought this one was pretty slick, albeit much more complicated. Variable voltage, variable current PIC controlled.

    http://www.linuxfocus.org/English/November2002/article251.shtml

  3. Andrew says:

    In general, linking to people hosting on their private ISP line is a no-no…

  4. Bas Withagen says:

    comment @ PsyKotyk:

    it uses an AT90S4433 fomt Atmel. not a pic ;)

  5. strider_mt2k says:

    Dude we all know it will never look this good again.
    It’s part of the process.

    Let go, remove the plastic from those meters.

  6. andrew says:

    a. #5, the plastic on the led meters looks tacky but makes it much easier to read. overhead fluorescent lighting and the fact that each led segment that is off is white in color makes it very hard to read in normal conditions.

    b. i don’t understand, #4, i’ve hosted from my home for years. hackaday has linked to hacks hosted right here on at home many times in the past with no problems (that I have heard of). right now i’m able to connect just fine away from home, but if there *are* problems please email me.

  7. andrew says:
  8. carlton says:

    nice psu, with one big caveat. still bugs me, keep seeing psu’s up on hackaday with *no current limiting*. seriously, why is no one implementing it? it really isn’t that hard. also, keep seeing designs (like this) using the old LM7xxx series of linear regulators. would like to see some designs using smps regulators. then you won’t have to worry about all that heat when going from 35V to 5V (14% efficiency means lots of heat). makes me laugh, psu drawing less than 1A requiring *that* much heatsinking.

    oh well, time for a new project.

  9. Dave says:

    These are drop-in SMPS replacements for LM7xxx regulators. Same pins, small package, very efficient, very little heat.

    http://www.trossenrobotics.com/store/c/3088-Voltage-Regulators.aspx

  10. Myself says:

    #8, I await your design. :) Seriously, I just learned about SEPIC topology and when I take my electronic training-wheels off, I plan to build a number of SEPIC-based power converters for various applications.

    In the meantime, if someone with the requisite skills wants to take that ball and run with it, I think it’s really an underutilized technology that hobbyists would enjoy. Particularly if the control function can be done with an ATtiny13 and offboard FETs instead of some dedicated chip.

    Why do hobbyist supplies always stop at 30 or 35 volts? That’s such crap. There’s plenty of fun gear in the 48-volt range, and powering it is a pain!

  11. Alex McCown says:

    i use a pcu as my powersupply but the peek i can get is 24v (12 and -12) i need to feed 40v in to my flyback drivers so i like this hack

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