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ESR Meter MK-II

Discussion in 'Electronic Repair' started by Wayne Tiffany, Sep 16, 2004.

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  1. I just wanted to share my recent experience with building the ESR meter,
    batch number 7214211 for anyone interested. I ordered from John's Jukes
    Ltd. and was told to expect it in a week or so. Heck with that - I got it
    in 3 days! So, that weekend I started on it. I had already read all the
    instructions before starting (I know, one of those...) so the start of
    assembling was easy - unpack things into a small tray and have at it. Not
    knowing for sure what I was going to receive, I had printed out the
    downloaded instructions in color to pre-study and assist me. Keep in mind
    that these are only comments to help Bob & others, not complaints - I am
    well pleased with the kit and the meter.

    1. The kit came with a set of printed instructions in black and white and I
    found my color ones to be a handy reference for verification.

    2. The kit also came with a page with 2 corrections. It would be nice for
    Bob to get the internet copies updated.

    3. Page 9 is missing the identification of figure 7. I was trying to do
    this project slowly & carefully and it took a bit to find it and make sure I
    understood the point.

    4. I chose to put longer wires on the switch & posts so I could separate
    the front panel from the circuit board. User preference.

    5. I wasn't able to bend the battery holder tab on the large one far enough
    to directly solder it to the smaller one per the instructions. I had to
    join them with a short piece of wire. Not a problem.

    6. The annotation on Fig. 13 for the tape that holds the battery holders is
    mis-spelled in that it's missing an "l". Then you could also go to the
    point that all tape has 2 sides... :)

    7. I found that the schematic called for D3 & D4 to be 1N4002, when in fact
    the supplied ones were 1N4004. Fig 9a & the parts list show them as 1N4004.

    8. For me the easiest way to install the components was to pick a resistor,
    bend all of that value, and then install them. That way it was a double
    check right then as to whether or not I had found them all. When I got down
    to the last two resistors, I hunted all over the board to find a home for
    them. Upon not finding them, I finally went back to the Parts List and saw
    that they were only for calibration and didn't have a home. Guess I didn't
    *completely* read the instructions. :-(

    9. I only used about 10% of the included solder. It was certainly more
    than plenty, but better than running out.

    10. The silk screening verbiage didn't exactly match the diagrams, but it
    wasn't a problem.

    Bottom line is that all the parts were there and in good condition. I was
    able to assemble the kit, run the diagnostics (all ok), and use it without
    having to ask anyone anything. Good job guys! Bob, consider this my
    returned Quality Control Card.

    WT
     
  2. JURB6006

    JURB6006 Guest

    the supplied ones were 1N4004.

    1N4001 through 4007 are the same family of diodes with 4007 having the highest
    ratings. You can always use a higher number within that range.

    In a way you could consider it a free upgrade.

    JURB
     
  3. That was my conclusion also. Thanks for the confirmation.

    WT
     
  4. david

    david Guest

    4. I chose to put longer wires on the switch & posts so I could separate
    http://members.ozemail.com.au/~bobpar/esrmeter.htm

    I just built one of them found it a great kit, but I just had to mod it by
    drilling holes under the pots so they can be adjusted
    without removing front panel. I did then have to reroute a track with a
    resistor leg :)

    my 2cents worth

    David
     
  5. Bob Parker

    Bob Parker Guest

    Hi Wayne and everyone,
    I've sent all your comments to the people in the Dick Smith
    Electronics Kit Department, to refer to next time they update their
    kit notes.
    I'm also trying to get hold of the corrections so I can put them on
    my website.
    Thanks for taking the time to write down all your experiences and
    thoughts. I hope you find lots of defective caps with your new meter.
    :)

    Regards,
    Bob
     
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