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Question about failing starter capacitors on electric motors

Discussion in 'Hobby Electronics' started by Rod Out Back, Jan 30, 2007.

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  1. Bob Parker

    Bob Parker Guest


    Good question - it sorta looks like they might be, doesn't it?
     
  2. Bob Parker

    Bob Parker Guest


    You might be thinking of Jaycar? ;)

    In the case of DSE it'd be MP3 players, cordless phones and TomToms
    etc...
     
  3. Bob Parker

    Bob Parker Guest

    The Mk2 version can do some basic checks of its own circuitry if
    there's a problem getting it working after construction. Generally
    irrelevant if you know how to solder and put components in the right
    place. ;)
    Also the automatic switch-off time is 3 minutes as against 2 minutes
    for the Mk1. Mk1 is powered by a 9V alkaline battery while Mk2 uses 6 x
    AAA cells. Mk2's front-panel typical ESR value chart is more up to date.
    There's no difference in their circuit boards or components.
    Phil's already given some possible uses. The kit notes have more
    suggestions (page 13). You can download it as a 1.3MB .pdf file from:
    http://members.ozemail.com.au/~bobpar/k7214.pdf
    There's also a lot of suggestions/hints from users at:
    http://members.ozemail.com.au/~bobpar/esrhints.htm

    Hope this answers your questions.



    Cheers
    Bob
     
  4. Bob Parker

    Bob Parker Guest


    G'day Geoff,
    Reasonably fair. What it doesn't mention is that you don't need a
    lot of accuracy to identify which electrolytic cap's causing a problem
    in a circuit. Its measured ESR will be so far above what the chart says
    (often not even giving a reading because it's >99 ohms), that it'll
    stand out like the proverbial(s). That's why the meter's only got a 2
    digit display.
    I don't agree that there's a problem with the component quality.
    No-one's ever complained to me about it.

    Bob
     
  5. Bob Parker

    Bob Parker Guest


    I agree with Phil!

    Bob
     
  6. Phil Allison

    Phil Allison Guest

    "Bob Parker"

    ** But what folk here don't know is that Bob is very large, heavily
    tattooed and very mean looking .....





    ........ Phil ;-)
     
  7. Bob Parker

    Bob Parker Guest


    DAMN!!!!
    I was hoping no-one would identify me at the aus.electronics
    get-together.
    Now the cat's outta the bag.


    Bob
    ;-)
     
  8. Tom

    Tom Guest

    That's true, both Mk1 and Mk2 are the same price, I wanted to get one yesterday and first DSE shop I went had only Mk1, had to drive to a second one but it was worth it as they had Mk2 (and few more cheap kits in stock).
    Tom
     
  9. Bob Parker

    Bob Parker Guest

    Well done! I hope the meter pays for itself before too long. :)

    Bob
     
  10. Tom

    Tom Guest

    At that price it is well worth buying even if I don't use it too often and this kit stands out of the rest - good quality PCB with overlay and nice front panel. Good work Bob!!!!

    Tom
     
  11. Bob Parker

    Bob Parker Guest


    Thanks Tom, but John and Bill in the DSE Kits Dept get all the
    credit for making it into a nice kit. :)
    See http://members.ozemail.com.au/~bobpar/dsestaff.htm

    Cheers
    Bob
     
  12. Bob Parker

    Bob Parker Guest

    Hi Terry
    Postage to NZ from the Western Island shouldn't be too pricey so
    you'll still get it at a good price. ;-)
    I hope it'll pay for itself in time saved.

    Cheers
    Bob
     
  13. Phil Allison

    Phil Allison Guest

    "Bob Parker"

    ** I picked up an ESR Meter mk2 kit from DSE's "Mid City Centre" store on
    Saturday - for a mere $25 it means I now have a spare. All the components
    look to be of good quality and the instructions even printed on decent (
    glossy) paper for once.

    However, the LTS5503AE displays included are rather dim - IMO not
    useable in the sort of light most would have on a service bench. My old one
    used the LSD5114s and is quite OK in such light.

    Farnell have common cathode HE red displays from Kingbright ( # 622-205 )
    for about $1.40 each + gst that should be a lot better.




    ........ Phil
     
  14. The Mk2 kit I got the other day also has the dim display, pretty
    annoying. But considering that I will rarely use such a meter it's not
    a big deal for me. But I can imagine it would drive a tech who uses it
    every day nuts.

    Dave :)
     
  15. Bob Parker

    Bob Parker Guest


    OK, now I can say I've had complaints about component quality. :-(
    In the original project, I specified Kingbright SC56-11SRWA 'super
    red' high efficiency displays. In fact when Jaycar were making the kit,
    they did the right thing and included them. You can almost read a Jaycar
    ESR meter in direct sunlight.
    DSE decided to supply those considerably dimmer orange displays they
    were already selling. I was never very happy about their brightness.
    Looks like they've gone to including even lower efficiency displays now.
    The Kingbright SC56-11EWA ones Phil's found appear to be a later
    version of the original SC56-11SRWA and should be brilliant. Thanks for
    the info, Phil.

    Cheers
    Bob
     
  16. Bob Parker

    Bob Parker Guest


    I never was too good at geography. :)
    Good luck with your design, and just be careful to discharge those
    caps before you touch them, let alone measure their ESR....

    Cheers
    Bob
     
  17. Well, if you want to get picky then there were also some incorrect
    pitch capacitors supplied, and some of the resistors were incorrect
    tolerance. Also, I got Orange 3mm LEDs with Red 7-seg displays.

    Dave :)
     
  18. Bob Parker

    Bob Parker Guest


    Thanks for the feedback... I like to know what people building the
    kits are experiencing, so I know what they're talking about if they
    contact me about problems.

    Bob
     
  19. Oh, and your software fault diagnostics works a treat too. Built mine
    in haste during lunch hour at work and my brain wasn't switched on, so
    accidentally installed a wrong value resistor and got the F1 error
    message :-/
    Yes, you can build it and test it (and troubleshoot it) in under 1
    hour, and still have time to each your lunch.

    Dave :)
     
  20. Bob Parker

    Bob Parker Guest


    I did the self-test function to try and reduce the number of e-mails
    I was getting from people with construction problems (mostly solder
    whiskers).
    It was amazingly successful.... I hardly get any e-mails like that
    now. :)

    Bob
     
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