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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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14th Aug 2020, 12:02 pm | #1 |
Dekatron
Join Date: Dec 2004
Location: East Yorkshire, UK.
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Opening Choke on Computer lead.
Is it possible to open the annoying little choke on end of power supply lead ? I need to re-purpose one from an old lead, instead of waiting for a snap together one from China.
John.
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14th Aug 2020, 2:00 pm | #2 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,637
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Re: Opening Choke on Computer lead.
Several methods here: https://vintage-radio.net/forum/showthread.php?t=157796
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14th Aug 2020, 3:05 pm | #3 |
Dekatron
Join Date: Dec 2004
Location: East Yorkshire, UK.
Posts: 3,959
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Re: Opening Choke on Computer lead.
Thank you Bill, but not much help, as I need the case and not bothered about breaking the Ferrite core. I expect they are moulded on the cable with no easy way of removing them. I think I will have to order one of the snap together ones from China and wait ... and wait... not ideal when I could have used it yesterday.
John.
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14th Aug 2020, 3:30 pm | #4 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,637
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Re: Opening Choke on Computer lead.
How about pulling the inner cable out and carefully crushing the ferrite then?
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14th Aug 2020, 5:23 pm | #5 |
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Re: Opening Choke on Computer lead.
Do you need the choke? Most of these are but a token to EMC.
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14th Aug 2020, 5:33 pm | #6 |
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,801
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Re: Opening Choke on Computer lead.
Most of them are a complete sleeve/toroid core and are not split. They went on the cable before the connectors were fitted.
Making a split core pair is VERY expensive. The ferrite needs to be ground to a very flat very shiny finish to avoid air gapping. The one-piece ones are just sintered in one go. There's something like a 20-fold difference in manufacturing cost. Often the plastic housing is moulded straight over the core and cable. David
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14th Aug 2020, 6:15 pm | #7 |
Dekatron
Join Date: Dec 2004
Location: East Yorkshire, UK.
Posts: 3,959
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Re: Opening Choke on Computer lead.
No, I just need the empty plastic case to hide a small circuit on an audio lead. It should look better than a bulge of heat shrink tubing.
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14th Aug 2020, 10:22 pm | #8 |
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Re: Opening Choke on Computer lead.
Ah, now I understand. A slice through one side along the cable axis with a new scalpel should let you peel the shell away, dunking in hot water will help. They are injection moulded and the plastic tends to stick to the original cable, but not too well. Practice on a duffer.
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14th Aug 2020, 10:25 pm | #9 |
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Re: Opening Choke on Computer lead.
And a dunk in boiling water will restore it after all the mangling needed to get it off.
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15th Aug 2020, 1:48 am | #10 |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,676
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Re: Opening Choke on Computer lead.
I used to collect plastic 35mm film cans for that sort of thing.
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15th Aug 2020, 7:14 am | #11 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
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Re: Opening Choke on Computer lead.
Might have one John, will check today, yours for postage.
Andy.
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15th Aug 2020, 9:23 am | #12 | |
Dekatron
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Re: Opening Choke on Computer lead.
Quote:
John.
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15th Aug 2020, 2:58 pm | #13 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
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Re: Opening Choke on Computer lead.
Here you go John, see pics. Dimensions are 1 1/4" long, 7/8" sq. Drop us your address if of any use. I have four of them.
Andy.
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15th Aug 2020, 4:15 pm | #14 |
Dekatron
Join Date: Dec 2004
Location: East Yorkshire, UK.
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Re: Opening Choke on Computer lead.
Thank You Andy that will be great. PM sent.
John. Please close this thread.
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