MJLorton Solar Power and Electronic Measurement Equipment Forum
Youtube Video Episodes => YouTube Video Episodes => Topic started by: TorqueRanger on July 25, 2013, 07:15:16 AM
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https://www.youtube.com/watch?v=bHHAuDPh13Y
Where can I find the build thread or get those little pieces for the multimeter???
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Are you talking about the test leads I was using? If so chat to Franky here: http://mjlorton.com/forum/index.php?topic=227.0
Cheers,
Martin.
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Are you talking about the test leads I was using? If so chat to Franky here: http://mjlorton.com/forum/index.php?topic=227.0
Cheers,
Martin.
Sorry for the late response but I was talking about needle point pin that you used to to test the tranformer and said it could be use to pierce insulation...
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Hi Martin, newbie here.........
Looking to buy a bench power supply, but would love to make my own for education,
what's your outlook on progress with the project.
Appreciate you are a busy guy ;D
Regards, Eddie
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Are you talking about the test leads I was using? If so chat to Franky here: http://mjlorton.com/forum/index.php?topic=227.0
Cheers,
Martin.
Sorry for the late response but I was talking about needle point pin that you used to to test the tranformer and said it could be use to pierce insulation...
Aaah...that clever needle point. It was made by a viewer and sent to me.
I would post pictures to aid with making one yourself but I think you need to be very careful on how and where it is used. It's very handy, but I could see concerns about piecing insulation to get readings or do continuity tests.
Would be keen to hear what others have to say.
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Hi Martin, newbie here.........
Looking to buy a bench power supply, but would love to make my own for education,
what's your outlook on progress with the project.
Appreciate you are a busy guy ;D
Regards, Eddie
Hello Eddie,
First off, welcome aboard!
Ok...yes, life is even more manic than usual with our move to a new home and setting up a new lab again.
It's one of the goals for the (early I hope) new year...
1. Complete the initial electronics tutorial series...about two videos left.
2. One or two more videos on how to solar power your home.
3. Complete the power supply project
4. Setup multimeter selection tool website / page
5. Battery / energy storage database website / page.
I won't commit to a date as there's a fair bit to fit in between those goals...and I just end up shooting myself in the foot...but it will happen.
Cheers,
Martin.
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Are you talking about the test leads I was using? If so chat to Franky here: http://mjlorton.com/forum/index.php?topic=227.0
Cheers,
Martin.
Sorry for the late response but I was talking about needle point pin that you used to to test the tranformer and said it could be use to pierce insulation...
Aaah...that clever needle point. It was made by a viewer and sent to me.
I would post pictures to aid with making one yourself but I think you need to be very careful on how and where it is used. It's very handy, but I could see concerns about piecing insulation to get readings or do continuity tests.
Would be keen to hear what others have to say.
Would love to see and learn more about it and how it's made ...
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I look forward to the power supply been finished, as part's sit here on the shelf waiting ;)
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I too am waiting in anticipation of this project moving forward :)
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Are you talking about the test leads I was using? If so chat to Franky here: http://mjlorton.com/forum/index.php?topic=227.0
Cheers,
Martin.
Sorry for the late response but I was talking about needle point pin that you used to to test the tranformer and said it could be use to pierce insulation...
Aaah...that clever needle point. It was made by a viewer and sent to me.
I would post pictures to aid with making one yourself but I think you need to be very careful on how and where it is used. It's very handy, but I could see concerns about piecing insulation to get readings or do continuity tests.
Would be keen to hear what others have to say.
He can you post any more information about these or where to buy them ?????
Thanks
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I don't think you can buy such a device...but I stand to be corrected. Here are some pictures to try give you an idea of how it was made.
Looks like a pin in a thin nylon sleeve which is all heat shrinked onto a connector that accepts a multimeter probe tip.
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I don't think you can buy such a device...but I stand to be corrected. Here are some pictures to try give you an idea of how it was made.
Looks like a pin in a thin nylon sleeve which is all heat shrinked onto a connector that accepts a multimeter probe tip.
Thanks for the pics ..
I am not sure if you can buy them or not and that's why I am asking u cause you got them from someone .. Lol I was hoping you had access to the a build thread of those or pics without the heat shrink tubing but wouldn't ask you to destroy you set but do you remember who got them for you ????
Thanks
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I managed to find an email from the gent that made it just about a year ago. I've sent a message to him asking if he can provide build instructions / pictures. I'll post if he comes back to me.
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I've got a pair of these Taiwanese made add-on needle tips for regular probes. They don't have the insulation sleeves like the one Martin used in the video, but I suppose you can easily just add some heat shrink tubing to insulate if needed.
I might stock these if there's a demand for these things.
(http://i.imgur.com/39MMFvC.jpg)
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Trust Franky to find a solution! Good man.
I did receive a reply from the good gent (Frank) regarding his DIY option...here is the info:
Insulation piercing probe tip:
"I only have one photo of the probe tips that I made. The white horizontal pcb mount style '2mm tip jack' that I bought years ago (looks more like a capacitor in the photo) come in various styles. Here is a more commonly shaped one at Mouser for example...
http://ca.mouser.com/ProductDetail/Johnson-Emerson-Connectivity-Solutions/105-0604-001/?qs=sGAEpiMZZMs4AFwHyzhTm8V3%2fI88es6weQUA1mSWlqA%3d
I see that Element 14 carries a horizontal style 2mm, 5A max capacity tip jack that is basically similar to the one in the photo I sent you that displays the items used for my insulation piercing probe tip adapter.
http://www.newark.com/emerson-connectivity-johnson/105-0753-001/test-jack-horizontal-5a-black/dp/39F1744
These particular tip jacks are fine for probing relatively low voltage, low power circuits.
The short terminal at the end of that particular style of tip jack could have one of its sides filed flat and then a short piece of a sewing needle could be soldered against the side of that terminal (I wore safety glasses when I snapped the sewing needle in half using a pair of pliers). The whole assembly could then be covered in shrink sleeving, leaving only a minimal amount of the sharp needle tip exposed.
Honestly, any style of female tip jack could be used as long as it has the required 2mm (0.080") opening to grip a standard DMM test lead probe tip firmly."
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Hi Martin. In video #1, you mentioned using a stencil to do the lettering on your college power supply. Can you perhaps show an image of kind of stencil you used? The result looks pretty good. Thanks.
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I can speak from experience, you can without thinking stick one into one of your fingers,and yes it hurts a lot for several day's and I can also speak from experience that you can add at least 20 New swear words to your repertoire,
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I've not seen those transfer stencils for years. I did a quick search online and could not find any. It used to come in the form of an a4 sheet or other sizes with a whole host different of fonts. You then held it against the surface you were "printing" on and rubbed over the top of the sheet with a pencil that transferred and stuck the lettering onto the surface.
Perhaps ask an art supply store?
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Does look like Letraset no longer supplies them, though they still have the crepe tape in assorted widths for use as traces. They still do lettering in assorted fonts and some graphics, but it looks like the PCB layout stuff has disappeared. Not surprising as they were IIRC quite expensive per sheet, and a sheet did last for a long time.
Only thing is that you had to be aware of scale, as the sheets were IIRC available in either 0.1 or 0.15in spacing, and in either full size, 2x or 4x enlargements for photographic reduction onto acetate film to master the board, or to be used with a photographic exposure unit to directly expose the sensitised PCB sheet. I had a lot of fun with that, though I did find out the hard way ferric chloride will stain almost everything.
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Letraset: still available in the UK,WH Smith do their version, not forgetting E-Bay of course.
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How To Use Dry Transfer Lettering
https://www.youtube.com/watch?v=ed6iXQW_O1U
9.5mm Rub-On Black Letter Transfers, 'Letraset type' for Art & Craft, BL74
http://www.ebay.com/itm/181529946619
Mecanorma Dry Transfer Lettering Sheet A3, Rub-on, Letraset #65
http://www.ebay.com/itm/381090589041
http://www.archertransfers.com/AR35108B.html
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I built the DIY Bench Power Supply and it seems like the constant current will not go below about 30 MA. It would be nice to go down to 10 MA or so, to test LED's, and etc.
Anyone have any mods to lower the constant current?
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Hi Phil, I also saw a problem like that on my test circuit. Try a diode on the emitter of the 2n222 transistor (ouput of the current sense op amp ) to the negative rail. I've not tried this yet but post if it works.
Cheers, Martin.