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Old 31st October 2016, 11:55 AM   #1
pl802 is offline pl802  United Kingdom
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Default A lesson learned!! What's yours?

In the process of building an amp I've been using crocodile clips in the psu section.I'd been experiencing some odd behaviour when checking actual voltages on test.I put this down to house mains variation.After all it was making sound.But last night I noticed a mini thunderstorm in the jaws of the clip lead at power on.Wish I had a recorded footage of it.Amazing to see!
On pulling back the protective covering here's what I came across.The maker didn't even bother to solder the leads.Penny pinching?

First pics are of the offending sod of a lead,the rest my repair job.
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File Type: jpg Crocodile Leads...Short.jpg (873.9 KB, 183 views)
File Type: jpg Crocodile Leads...Short3.jpg (730.1 KB, 172 views)
File Type: jpg Crocodile Leads...Short4.jpg (492.6 KB, 168 views)
File Type: jpg Crocodile Leads...Short1.jpg (225.6 KB, 168 views)
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Old 31st October 2016, 03:04 PM   #2
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by pl802 View Post
The maker didn't even bother to solder the leads.Penny pinching?
Yeah, pretty standard practice for that kind of item. You may even find that the "copper" of the wire is in fact magnetic....
Probably some advance in the quantum material physics....
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Old 31st October 2016, 04:50 PM   #3
DF96 is offline DF96  England
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Cheap 'test leads' with croc clips on the ends are almost always badly made. Even if they are soldered you can't be sure it is a good joint.
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Old 31st October 2016, 05:40 PM   #4
pl802 is offline pl802  United Kingdom
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By the way after soldering the leads I noted an increase of 20 Vdc in my B+ supply.Interesting no.
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Old 4th November 2016, 05:07 AM   #5
dangus is offline dangus  Canada
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I generally buy Mueller alligator clips and make my own leads. Their clips are little works of art, with jaws that mesh perfectly.
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Old 4th November 2016, 11:03 AM   #6
pl802 is offline pl802  United Kingdom
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Solid copper !! Those are nice.....and available at digikey.
Cheers dangus

meuller.com
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File Type: jpg Mueller BU-60C1. Solid Copper Alligator Clips..jpg (43.7 KB, 81 views)

Last edited by pl802; 4th November 2016 at 11:04 AM. Reason: spelling error
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Old 4th November 2016, 11:07 AM   #7
pl802 is offline pl802  United Kingdom
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Edit that should be

http://mueller.co/wp-content/uploads/DS-BU-60C.pdf
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