Ferrite rings

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Ferrite rings

This topic has 19 replies, 14 voices, and was last updated 20 March 2016 at 21:45 by Dod.

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18 March 2016 at 12:43 #230566
peak4
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@peak4
I know Google or similar should be my friend here, but struggling to find the right item.

I have a Gunson Superstrobe timing light for the car, but the ferrite ring on the HT pickup is cracked, so obviously doesn't work any more.

It's a square U shape and square cross section, as per the attached photos.

There is a sliding cover with a bar ferrite encapsulated to complete the magnetic circuit, and a coil round one leg of the U. I did try using a slice out of a round ferrite ring, but can't get it to work.

Anyone any thoughts for a supplier please?

I did contact Gunson, who put me in touch with their spares supplier, who in turn would only quote for a full replacement lead; Can't remember the exact price, but it was north of £50.

The U shape is dimensioned as follows;

i.e. approx 6mm x section, 16.5mm high, & 25mm wide

Edited By peak4 on 18/03/2016 12:44:03
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18 March 2016 at 12:43 #29585
peak4
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@peak4
18 March 2016 at 13:19 #230569
Jon Gibbs
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@jongibbs59756
You might have luck with RS here…

**LINK**

Good luck.

Jon
18 March 2016 at 13:26 #230571
Chris Evans 6
Participant
@chrisevans6
Not many of us use these now so keep an eye on the usual sites for someone selling a complete one.
18 March 2016 at 13:31 #230572
peak4
Participant
@peak4
Posted by Jon Gibbs on 18/03/2016 13:19:43:

You might have luck with RS here…

**LINK**

Good luck.

Jon

Unfortunately, unless I'm missing them, they only list 2 U ferrites, which are far too big, but thanks anyway.

Regards

Bill

Edited By peak4 on 18/03/2016 13:35:00
18 March 2016 at 13:34 #230573
peak4
Participant
@peak4
Posted by Chris Evans 6 on 18/03/2016 13:26:12:

Not many of us use these now so keep an eye on the usual sites for someone selling a complete one.

Thanks Chris, I already did that and have a working one now, but I'm trying to get my old one up and running too.

It's the later model with a dwell meter as well, but I've been keeping an eye out for a cheap one of either style as I assume the ferrites will be the same.

I don't really want to spend a load of dosh on another working one, as I'll still have the current one awaiting repair. Shades of Groundhog day.
18 March 2016 at 14:17 #230577
Ian P
Participant
@ianp
Have you tried gluing the broken one together?

I would expect that if the two faces were in good contact (a miniscule glueline) that it would work as well as it originally did.

Ian P
18 March 2016 at 14:25 #230578
john fletcher 1
Participant
@johnfletcher1
If you go onto Vintage Radio or Golborne Radio, you could put in a request, some one may be able to source one for you or know an equivalent. They are very knowledgeable people. John
18 March 2016 at 14:27 #230579
Les Jones 1
Participant
@lesjones1
Have you checked that the winding has not been damaged. Check with a meter that it is not open circuit. If the original core is stuck togeter with superglue or a THIN film of araldite I think it should work. I did a search on ebay for "ferrite transformer core U" and found this current transformer that may do the job. When I built one many years ago I just used a ferrite ring and it worked.

Les.
18 March 2016 at 15:36 #230589
Muzzer
Participant
@muzzer
As suggested, you should just glue it together again. As long as no significant fragments got lost and you don't make a large gap anywhere, it should work just fine. For production, these are generally glued together with cyanoacrylate or epoxy adhesives, the former often with an activator to make it "go off".

If you don't want to try that but can find a core of the correct physical dimensions, you shouldn't need to worry too much about the magnetic properties. As long as it's ferrite, rather than eg powder core I'm sure it will work fine.

Murray
18 March 2016 at 17:37 #230612
peak4
Participant
@peak4
Many Thanks folks, I'll give it another go.

Much appreciated.

bill
19 March 2016 at 09:28 #230688
Chris Evans 6
Participant
@chrisevans6
Bill is that a Marlin on your avatar ? In my car trial days they always did well on things like the MCC long distance trials. So much more comfort than a Dellow !
19 March 2016 at 09:56 #230695
John McNamara
Participant
@johnmcnamara74883
Many computer power supplies have leads wrapped around ferrite rings, they are used for reducing electrical noise

If you can get hold of an old one try pulling it apart You may find a ring that will work

Regards
John
19 March 2016 at 10:47 #230706
Andy Holdaway
Participant
@andyholdaway
Chris, the Marlin may be comfier, but it's no where near as cute! See my avatar!

Andy
19 March 2016 at 13:59 #230739
peak4
Participant
@peak4
Posted by Chris Evans 6 on 19/03/2016 09:28:48:

Bill is that a Marlin on your avatar ? In my car trial days they always did well on things like the MCC long distance trials. So much more comfort than a Dellow !

It is indeed, but not a trials car. This one's a Berlinetta, built by the previous owner from a Mk3 Cortina; 2l Pinto with a 5 speed type 9 box.

He did make a decent job of the build,as his day jow was something to do with building limos for Jaguar Daimler.

I just wish he'd discovered rivnuts though. As I work on bits, I'm gradually replacing loose nuts with captive ones.

My other Avatar's a Lightwight Landrover. (V8 auto)
19 March 2016 at 14:35 #230746
frank brown
Participant
@frankbrown22225
Lightweight Landrover, that's an oxymoron.

Frank
20 March 2016 at 09:05 #230818
Ian S C
Participant
@iansc
There are lots of Ferrite cored transformers etc with cores about the size you want in modern electronic gear, you'v got to be a right magpie to get a good junk box.

Ian S C
20 March 2016 at 18:17 #230937
Tim Stevens
Participant
@timstevens64731
The Lightweight Landrover was an actual model, and not the first contradiction in naming cars.

The preferred name is 'Air Portable', and they are the ones with the corners chamfered.

Cheers, Tim
20 March 2016 at 19:01 #230946
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Tim Stevens on 20/03/2016 18:17:32:

The Lightweight Landrover was an actual model …

.

Quite so, Tim … and a fine early example of MoD Procurement 'manipulation'

**LINK**

MichaelG.
20 March 2016 at 21:45 #230966
Dod
Participant
@dod
Yup, a friend of mine bought one from an auction of ex-military vehicles, went a bit pale when I asked him if it had been air dropped on the parachute pallet.

No top, no heater and half doors so he really froze driving it from Leeds to the south coast of the Moray Firth in August

Edited By Dod on 20/03/2016 21:47:31
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