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Thread: Farnell Pieces for Sproggy's PSU

  1. #1
    Constant Bitrate
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    Post Farnell Pieces for Sproggy's PSU

    Well, I've been searching the Farnell website for some time now, and I was able to figure out a few of the pieces that I need. However, many pieces pull up several hits when I search for the part number in Sproggy's part list.
    Most don't even have any difference except the item number... these I figured that I can use any one that I choose.

    For some however, (the low ESR cap is one example)... I can't figure out which one to get. Can anyone help me by letting me know the order code (SKU) for these parts?

    I really would like to know the order code for almost all of the Farnell pieces, so any information or tips that I might follow would be greatly appreciated.

    Thanks in advance.
    -Miles
    Near Completion: Intel P166 MMX, 32MB ram, 13GB Hard Drive, Keypad, 4x40 LCD. Sproggy MK2.6 ATX PSU. Win98SE with Winamp and Mark Zehnder Plugin. (Web-site: very soon)

  2. #2
    Newbie
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    I think the different caps have different voltage ratings, thats all I can think of...
    You could get ones that are something like 16volts, or just get the highest voltage ones they have..

  3. #3
    Raw Wave Rob Withey's Avatar
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    Originally posted by SkinnyBoy:
    <STRONG>I think the different caps have different voltage ratings, thats all I can think of...
    You could get ones that are something like 16volts, or just get the highest voltage ones they have..</STRONG>
    Wrong, there is a lot more difference than the voltage rating...!

    Low ESR (Equivalent Series Resistance) are capacitors more suitable to use in switch mode power supplies than the more commonly available cheaper ones. Using the wrong type of capacitor will limit the performance of your switcher.

    Essentially, afaik, at high frequencies (such as those apparent at the output of a switcher), a capacitors ability to smooth the output by absorbing peaks and filling in the dips (simplication), can be limitted by its effective source/drain resistance. A low ESR capacitor is better suited to smoothing the output of switchers with their high frequency components.


    Rob
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

  4. #4
    Constant Bitrate
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    Okay, Thanks Rob... however, there's nothing in the catalogue that mentions the ESR type of the caps. There's also very little info on the diodes, the cmos and some other stuff... I can't even find the relay!

    Please excuse my incompetence, but I'm quite confused over this matter. SKU's would be very very helpful.
    Near Completion: Intel P166 MMX, 32MB ram, 13GB Hard Drive, Keypad, 4x40 LCD. Sproggy MK2.6 ATX PSU. Win98SE with Winamp and Mark Zehnder Plugin. (Web-site: very soon)

  5. #5
    Constant Bitrate
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    Okay, here's the horror story:

    I just spent the last 2 hours checking and confirming that I have the right pieces in my shopping cart at Farnell. And finally I go to submit my order, and it says "The shipping address must be in the United Kingdom"!!!! AAAAAGH I live in California!.

    So, I decided to try to order everything from digikey, but I can't find a damn thing there (with Farnell, I got the SKUs from the MK2.5 part list, and I figured out the extra things needed for the MK2.6 on my own).

    Does anyone, have a receipt from digikey, or some other place that will have all the pieces (and ship them to me)????

    This is getting really frustrating

    -Miles
    Near Completion: Intel P166 MMX, 32MB ram, 13GB Hard Drive, Keypad, 4x40 LCD. Sproggy MK2.6 ATX PSU. Win98SE with Winamp and Mark Zehnder Plugin. (Web-site: very soon)

  6. #6
    Low Bitrate
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    Talking

    Okay, here's where I got mine in the US
    www.mouser.com
    140-ESRL25V470 470uF 25v Low ESR $0.86/each.
    140-ESRL25V330 330uF 25v Low ESR $0.62/each.
    140-ESRL25V220 220uF 25v Low ESR $0.57/each.

    This is also one of the very few sites I could find the 1800uf cap at. Quick service, too
    CarMP3 system:
    200mhz, 20gb hotswapable drive, 128mb, Winamp w/full-screen vizes, (upgrading to WinAmp3 in near future), 5" LCD screen, controled by numberpad, Sproggy PS under construction, custom mounting case under construction.

  7. #7
    Constant Bitrate
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    cool, I try this place for some of the other stuff that I'm having a hard time finding.
    Thanks.
    -Miles
    Near Completion: Intel P166 MMX, 32MB ram, 13GB Hard Drive, Keypad, 4x40 LCD. Sproggy MK2.6 ATX PSU. Win98SE with Winamp and Mark Zehnder Plugin. (Web-site: very soon)

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