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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 28th Sep 2020, 11:17 am   #1
stuart_morgan_64
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Default What are these?

Just in case they maybe useful, does anyone know what these are?
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Old 28th Sep 2020, 11:43 am   #2
M0FYA Andy
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Default Re: What are these

Coil formers?

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Old 28th Sep 2020, 11:51 am   #3
stuart_morgan_64
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Default Re: What are these

Posible there are gaps for the windings to go from oe section to another
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Old 28th Sep 2020, 12:55 pm   #4
HamishBoxer
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Default Re: What are these?

Some sort of RF choke??
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Old 28th Sep 2020, 1:08 pm   #5
sortedradio
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Default Re: What are these?

Are the made from aluminium? If so they look like some push on transistor heatsinks I've seen.
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Old 28th Sep 2020, 1:13 pm   #6
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Default Re: What are these?

Those slots would have been expensive to cut in an aluminium heatsink, and not necessary. Bushes for threads wouldn't have been needed either.

If a hard plastic or bakelite, then I think they're coil formers'

Any clues in where they came from?

David
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Old 28th Sep 2020, 1:59 pm   #7
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Default Re: What are these?

To me those slots on the base look like they are for some form of locking mechanism. I am fairly certain I have seen a similar method of locking before but my memory fails me.
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Old 28th Sep 2020, 2:10 pm   #8
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Default Re: What are these?

Can you read the text in the recess?
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Old 28th Sep 2020, 2:33 pm   #9
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Default Re: What are these?

I suggest formers for wirewound resistors. I had a Pye potentiometer unit with a number of similar coils for high stability close tolerance resistors for the decade multipliers. I am assuming the material is ebonite.
A much larger version of the sort of bobbin we see inside an Avo 7 or 8, or the Universal Avominor.
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Old 28th Sep 2020, 6:39 pm   #10
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Default Re: What are these?

I was going to say a coil former for a spark transformer off a gas appliance but then again they're normally quite cheap plasticky things, this looks rather more robust
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Old 28th Sep 2020, 11:39 pm   #11
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Default Re: What are these?

TO5 sized transistor heatsinks.

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Old 29th Sep 2020, 7:05 am   #12
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Default Re: What are these?

"TO5 sized transistor heatsinks." was going to suggest that too as Martin did but "Those slots would have been expensive to cut in an aluminium heatsink, and not necessary." as David says, same goes for the threaded inserts and look at the size, way too big for TO5.

Also being made out of ali & not a ferrite type material EG a conductor without a insulated covering rules out coil formers surely.

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Old 29th Sep 2020, 7:11 am   #13
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Default Re: What are these?

Possible that it’s a shaft coupling in a drive system. This acts as a damper for slight miss alignment of the two shafts. Motor to reduction gear box – pump etc.

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Old 29th Sep 2020, 3:44 pm   #14
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Default Re: What are these?

Quote:
Originally Posted by Bobdger View Post
Possible that its a shaft coupling in a drive system. This acts as a damper for slight miss alignment of the two shafts. Motor to reduction gear box pump etc.

Bob
It does look a bit like one of those. I have one somewhere because one day it will 'come 'in'. But its a flexible plastic and has much thinner rings, joined in different places. Similar to this one: https://uk.rs-online.com/web/p/couplings/4106512/
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Old 29th Sep 2020, 4:24 pm   #15
stuart_morgan_64
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Default Re: What are these?

Thanks, lot's of suggestions. They are plastic. The text reads A.P. 5461 J.D. the chap who they came from worked on medical equipment in a hospital. They are rigid. Plug is for size guide.
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