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Old 10th July 2012, 07:51 AM   #1
NVD33 is offline NVD33  France
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Default Audio transformer brand

Hi,

I believe that this component is a transformer (see picture). It is just before the SPDIF output connector of a CD player. Does any one know it's brand ? I would like to look for the data sheet. I tried Lundahl and Jensen but didn't find.

Thanks for any info,
Vince
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Old 10th July 2012, 09:40 AM   #2
DF96 is offline DF96  England
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If it is for the SPDIF output then it is not an audio transformer but a pulse transformer. Someone on here will probably recognise the logo, or you may be able to find a site which lists electronic manufacturers' logos. Quite likely to come from an ordinary magnetics company rather than an audio specialist as all it is doing is passing pulses.
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Old 10th July 2012, 12:51 PM   #3
NVD33 is offline NVD33  France
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Hi,

Thanks for your reply. Of course it's a pulse transformer, I did'nt use the correct wording. I browsed the web looking for the logo but did'nt find yet, I also browsed pulse transformers section of electronics suppliers (Mouser, Digikey) but no success.
Is there an easy way to know if the transformer is symmetrical? By measuring windings resistance for instance?
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Old 10th July 2012, 01:45 PM   #4
DF96 is offline DF96  England
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Quote:
I did'nt use the correct wording
. . so you didn't convey the correct meaning. I only have limited reading ability; I can only read what people write, and then perhaps (if I know them) infer what they meant to write.

Winding resistance may help, but winding inductance (when removed from the circuit) may tell you more.
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Old 10th July 2012, 02:03 PM   #5
NVD33 is offline NVD33  France
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Sorry, you are right I didn't convey the correct meaning.

I try to find a way not to remove it from the circuit (if possible) I am afraid to destroy it (may be an obsolete component), I will keep on looking for the data sheet, will see after.
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Old 10th July 2012, 02:18 PM   #6
DF96 is offline DF96  England
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It is unlikely to be a unique part, so even if you break it I'm sure you could find something to replace it with. Maybe even wind your own. It is probably a step-down transformer, as SPDIF signal voltage levels on the cable will be lower than typical logic levels in the electronics.

If it is a CD player often found in Europe (and it is sufficiently old) then you could try asking here. There are a few people there who regularly get old CD players working again.
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Old 10th July 2012, 02:51 PM   #7
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From what looks like a datecode it might be 15 years old, so it might be difficult to find a same replacement, if that is what you want.
But, as DF96 mentioned, these are rather mundane pulse transformers.
One possible source is on the data sheet for, for instance, a sample rate converter, which often have app circuits that list the app engineers' fave S/PDIF transformer.

Edit: Google 602A pulse transformer gives the attached.....

jan
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Old 10th July 2012, 04:18 PM   #8
NVD33 is offline NVD33  France
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You can see the CD player pictures here

I inserted the link but if it does work please go to the post "I don't want to bin this CD player". It's an old CD player (1995 If my memory is good) made by a French brand Cairn (does not exist anymore). In a picture you can see the transformer behind an RCA.
I hacked the dac successfully thanks to the help of 2 DIY members (they put me on the way). My idea is to take this pulse transformer which is nore more in use and put it at the input of the CS8412 to see if it would improve the sound.

Thanks for your info I will report back
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