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  1. #16
    Join Date
    Dec 2018
    Location
    NSW
    Posts
    586

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    The machine I've pulled apart often had 2 of them wired in (not a bossweld). Is there a second one to compare it to?
    As for wiring them, pretty simple if you know which rectifier you need to install. Solder them with inputs opposite each other, and outputs opposite- I-O-I-O if you were to read it going clockwise. Doesn't matter which wire goes where on the input side as it just inverts the AC waveform. This was for the square format rectifiers. For all intents and purposes, 4 diodes wired in the same config would give the same result, but maybe not the longevity.

    Probably a good start to read the markings on your rectifier and dig up a tech sheet for that product online thru somewhere like RS components, mouser, or similar.

  2. #17
    Join Date
    Sep 2007
    Location
    Wentworth Falls NSW 2782
    Age
    77
    Posts
    134

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    Some pictures here of Bossweld MIG 186 PCB.

    https://www.bobthewelder.com.au/PCB-...ig186-156.html

    Findlay.

  3. #18
    Join Date
    Mar 2011
    Location
    Southern Flinders Ranges
    Posts
    1,536

    Default

    This is the only picture I have of the one from my old one. You could try PM’ing Lamestlama he bought it from me, and may be able to assist further.

    The AC attaches on the lugs sticking up, the rectified DC goes out on the plates marked +/-
    The polarity of the DC will be relative to which way you put the AC into it. Check it with a digital meter without the DC leads attached.
    Attached Images Attached Images

  4. #19
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    72
    Posts
    3,102

    Default

    Quote Originally Posted by racingtadpole View Post
    .....
    The polarity of the DC will be relative to which way you put the AC into it. .....
    That is not correct: no matter how you connect the AC, the DC output is always the same, as dictated by the diodes.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  5. #20
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    72
    Posts
    3,102

    Default

    Quote Originally Posted by MacPuddock View Post
    Some pictures here of Bossweld MIG 186 PCB.

    https://www.bobthewelder.com.au/PCB-...ig186-156.html

    Findlay.
    That is the PCB of the wire feed only. It's pretty well a generic Chinese one. They are genrerally quite reliable and haven't changed in decades. The blue relay switches the welding transformer on when you pull the trigger.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  6. #21
    Join Date
    Mar 2011
    Location
    Southern Flinders Ranges
    Posts
    1,536

    Default

    Quote Originally Posted by jhovel View Post
    That is not correct: no matter how you connect the AC, the DC output is always the same, as dictated by the diodes.
    Indeed, I was thinking of something else altogether when I wrote that...

  7. #22
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    6,446

    Default

    Hi Johhny 808

    We have a great bunch of members who are always ready to help a fellow member.

    There plenty to look at by going to FORUM in the left top CNR and click FORUM HOME.

    The page brought up scrolls down and shows the help pages and Sub Forum interests. Please read our TOUs Terms of Use at the top.

    Don't forget to check out the sub forum and the Stickies with helpful information about the help pages and/or forums.

    Welcome to our Forums

    Grahame

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