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  1. #1
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    Default Moore and Wright charger

    G/day guy's, I grabbed a Moore and Wright 2000 micrometer off US ebay (90 bucks) and as expected the charger is 110 volt.
    I went digging in a box of old chargers in the shed and have found what I think will be a suitable replacement?
    However I thought that I would post photo's here as I don't want to plug the charger in and damage the micrometer.

    Will this Chinese charger be ok ?
    Attached Images Attached Images

  2. #2
    BobL is online now Member: Blue and white apron brigade
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    Have you actually checked the output of the chinese charger?

    The worst ones I have seen for a so called 12V was; on the high side was 18.5V ; while on the low side 7.5V.

    The other thing might be the cleanliness of the OP but that is usually less of a prob.

  3. #3
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    Ok thanks Bob, I will measure the voltage tomorrow.

  4. #4
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    Might be tricky to measure the voltage. According to the diagram the outer conductor is both +ve and -ve and the centre conductor is nothing.

    Dohicky.jpg

    I wonder how you would get approval for that.

    Dean

  5. #5
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    Just another thing to consider apart from what BobL has mentioned. The original device is a battery charger (to trickle charge delicate batteries), whereas the other plug pack you have is a power supply (to replace batteries). It's a bit hard to make out but it looks like the charger is limited to a current of 80mA whereas the plug pack has an potential output of 0.9A, which is over 10 times the amount of the charger. If the voltage on the plug pack isn't regulated very well, you could do some serious damage to the batteries in the unit if you hook it up.
    Depending on the construction, you might be able to either replace the main transformer of the charger with a 240V primary one, or you can get a small 240-110V 'step down' transformer and plug the charger into that. Something like this https://www.jaycar.com.au/50va-240va...ormer/p/MF1091
    Good luck with it.

  6. #6
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    Thanks Lovey71, 10 x ........ sheez !!!! damned electwonicals

    I will buy that stepdown transformer.

    thanks again, shed

  7. #7
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    Hi there,

    that AC/DC adaptor looks a bit suspect to me with contradictory approval markings, and an undefined output polarity marking, although in general it will be positive on the plug inner, but the reverse polarity is sometimes found.

    I wonder if the approval is real?

    The measured unloaded output voltage for this type of nominal 12 volt (trickle) charger can be up to 18 volts and this is normal.
    The charging voltage under load, ie when charging a good battery will normally fall to the correct nominal charging voltage.

    If you really want to try that adaptor as a charger, you might want to measure the voltage when charging.
    It should be slightly higher, eg 5-10 % higher, than the nominal battery voltage, and check that the battery temperature rise is not too high over say 30 minute intervals.
    The problem will arise that you cannot trust that adaptor as a charger on for a longer period of time, and that is the reason why original chargers are best, as the charger manufacturer will ensure that the charger in general can be left on charge without damage to either battery or charger.

    There is usually a lot of engineering involved with these things, but it often appears otherwise to a casual observer.

    I would buy a small 240-110 transformer, as suggested, and use the original charger, unless you could buy an original 250 V charger on say eBay.

    good luck, mike

  8. #8
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    Default it's a dud

    I found a 240 to 110 v transformer in the kitchen, it was bought to power a 110v ninja (food musher) that my son had bought.
    The batteries won't take a charge but the mic powers up from the charger ok.
    There is a problem with measurement repeatability, when I switch the mic on it reads as all zero's and each time that I open and close the mic, say 1/4" I get differing readings, it could 3 thou one time, open and close it again and it could 4 1'2 thou, if I open it say 1/32" it will show a negative reading when closed, if I open it to its maximum then when it closes it will give a reading somewhere between .0015" - .035".
    A bit of a search turned up this webpage whereby the fellow looks to me to have the same problem Moore and Wright Micro 2000 digital micrometer - UK Vintage Radio Repair and Restoration Discussion Forum and it appears that he didn't repair his problem as the problem was an IC that was special to these instruments and is unobtainable, well that was the gist of it what I could decipher from words that are quite alien to me.
    So at this stage I think I have an ornament, I'm thinking that maybe I could put a gold chain on it and wrap up it for a prezzie for the missus on her birthday

    cheers, shed

  9. #9
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    G'day Shed,
    if you haven't already done so remove the batteries, or they might leak and damage or destroy the inside of the battery compartment.
    I started reading that linked post about the IC as I was heading off to sleep and my eyes started glazing over , I'll have another look when I'm awake again.

  10. #10
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    G'day Shed,
    I had a read through that thread and unfortunately it looks like you might be out of luck. I've had a quick search for that part number and I got a few hits from obsolete parts sites, but they're are all based o/s and there's no pictures of the part. It depends on how far you wanted to go in getting it repaired as to how hard you try and chase down a replacement part. Sorry I couldn't be more help.

  11. #11
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    Thank you for your time and effort Lovey71, I don't think that I will persist with this as it is likely not worthwhile throwing any money at it, I'll look for something else I reckon.

    cheers, shed

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