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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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Old 14th Aug 2020, 12:02 pm   #1
60 oldjohn
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Default 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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Old 14th Aug 2020, 2:00 pm   #2
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Default Re: Opening Choke on Computer lead.

Several methods here: https://vintage-radio.net/forum/showthread.php?t=157796
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Old 14th Aug 2020, 3:05 pm   #3
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Default 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.

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Old 14th Aug 2020, 3:30 pm   #4
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Default Re: Opening Choke on Computer lead.

How about pulling the inner cable out and carefully crushing the ferrite then?
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Old 14th Aug 2020, 5:23 pm   #5
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Default Re: Opening Choke on Computer lead.

Do you need the choke? Most of these are but a token to EMC.
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Old 14th Aug 2020, 5:33 pm   #6
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Default 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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Old 14th Aug 2020, 6:15 pm   #7
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Default Re: Opening Choke on Computer lead.

Quote:
Originally Posted by merlinmaxwell View Post
Do you need the choke? Most of these are but a token to EMC.
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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Old 14th Aug 2020, 10:22 pm   #8
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Default 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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Old 14th Aug 2020, 10:25 pm   #9
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Default 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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Old 15th Aug 2020, 1:48 am   #10
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Default Re: Opening Choke on Computer lead.

Quote:
Originally Posted by 60 oldjohn View Post
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.
I used to collect plastic 35mm film cans for that sort of thing.
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Old 15th Aug 2020, 7:14 am   #11
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Default Re: Opening Choke on Computer lead.

Might have one John, will check today, yours for postage.

Andy.
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Old 15th Aug 2020, 9:23 am   #12
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Default Re: Opening Choke on Computer lead.

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Originally Posted by Diabolical Artificer View Post
Might have one John, will check today, yours for postage.

Andy.
That is kind of you if you can find one, the larger the better, but smaller than a film can.

John.
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Old 15th Aug 2020, 2:58 pm   #13
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Default 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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Old 15th Aug 2020, 4:15 pm   #14
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Default Re: Opening Choke on Computer lead.

Thank You Andy that will be great. PM sent.

John.

Please close this thread.
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