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Thread: `NEW' Small DC-DC ATX Power Supply

  1. #81
    C4M
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    Originally posted by KaBoom
    Well, met up with my friend today and found out that the power supply is all done!
    Great news KaBoom!

    Now that you have the parts side sorted, and are finalising testing, are you able to give us an indication of likely cost? I'm waiting on power supply before I build the enclosure, and your efforts are one of the candidates.

    C!
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  2. #82
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    thanks eugenen

    power supply works now thanks to the power good signal.

    specs and measurements are going to be taken in the next few days. some modifications are going to have to be made.

    pricing is going to be worked on now that we have it up and running.

    no fans no heatsinks, just gets warm.

    i'll keep you guys posted, looks like a winner

    -pete

  3. #83
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    Sounds like good news





    Weeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

  4. #84
    Maximum Bitrate eugenen's Avatar
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    FYI for Americans, digi-key lists these parts, 27.60 each. They charge shipping, but min order is only $25. I've ordered on a Monday and received my stuff on Wed using UPS ground before. I have to make a trip this weekend and since I haven't finished my linear I will be running off my inverter/atx supply but I may order a couple next week. Kaboom, they don't list 12v part numbers what are you doing for that?

    digi-keys address is www.digikey.com, you want pt6621 and pt6625 for 3.3v and 5v. TI's like is here http://focus.ti.com/docs/prod/produc...tNumber=PT6625

    seems a little bit pricy, but you get 6A out of both rails for $60 without heatsinks. If you added up all the sproogy prices it may be about even, I probabally paid close to that for all the little parts for my linear p.s. when you add up the regs, mounting hardware, heatsink, grease, etc.

    Straying off topic, I reinstalled my mp3player with XP to see how the hibernation works. I have a 3G HDD with nothing but XP, awinamp and the lcd plugin. Filled it up and can't even take all my music with me, but over half of my mp3's are rips from cd's I own and I still don't have all my cd's ripped, plus I have a few dups where I dl'ed and ripped them, so I'm pretty decont on owning all my music, some of the ones I don't own are older that I probabally can't buy anyway.

  5. #85
    Low Bitrate backpack09's Avatar
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    bump.
    im interested too, whats u got for dimensions and a price?


    dan

  6. #86
    Maximum Bitrate eugenen's Avatar
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    He seems to have disappeared. Check out TI's site, these are real simple, in, out, ground, and if you want a switch input (seems like it was designed for ATX). You could just buy a pair and hook them up easily. I was going to order one today, but got too busy at work, darn users anyway. If I order tomorrow, I'll still have it by the weekend.

  7. #87
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    @eugenen

    If you are really planning to build your PSU with these simple regulators, you should have a look at the Linear Technology types LT 10xx.

    They have a lot of different ones, adjustable or fixed, different loads (up to 10A), and they are a lot cheaper, around 7-10 over here in Europe.
    I took some of them (the LT 1074) for the Sproggy because I didn't have enough MAX 7xx, and they work great.

    cu
    tsingsu

  8. #88
    Maximum Bitrate eugenen's Avatar
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    Saw those, by the time I added on the external components the price was about even anyway.

  9. #89
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    sorry, didn't dissappear

    my one friend who has all the testing equiptment at his lab is away in seattle for the time being. he's working on putting out another pcb that'll fit all the components on.. i'm waiting on him to provide me the complete parts list so i can start pricing.

  10. #90
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    @all

    I have to come back to that again because I'm also working on a selfmade PSU now with parts easily available (regarding the big problems I had to get all the Sproggy parts):

    why are you so keen on these TI chips?
    Did someone ever have a closer look at the regulators that Linear Technology manufactures (the biggest supplier for regulators on MoBo's)?

    If you compare e. g. the LT 1083 CP-5 with the PT6625 you see that:

    - the LT is working from 6,5 - 20 V input
    - the LT gives up to 7,5A
    - the LT has an efficiency up to 90%
    - the LT cost about 7-10$ each

    So where is the advantage of the TI PT6625 ?

    Don't misunderstand me, I don't want to be a "jerk" (is that the right word?), but I want to develop something now as optimised as possible.

    cu
    tsingsu

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