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Old 25th May 2011, 08:56 PM   #11
gpapag is online now gpapag  Greece
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“Old” x-former

First att.:frequency response
Second att.:Intermodulation distortion (60Hz & 7kHz)
Third att.: Noise
Forth att.: Total harmonic distortion
Attached Images
File Type: png fr.png (5.6 KB, 113 views)
File Type: png imd.png (8.7 KB, 110 views)
File Type: png ns.png (9.7 KB, 110 views)
File Type: png thd.png (8.4 KB, 108 views)
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Last edited by gpapag; 25th May 2011 at 09:01 PM.
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Old 25th May 2011, 08:59 PM   #12
gpapag is online now gpapag  Greece
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"New" x-former

First att.:frequency response
Second att.:Intermodulation distortion (60Hz & 7kHz)
Third att.: Noise
Forth att.: Total harmonic distortion
Attached Images
File Type: png fr.png (5.6 KB, 109 views)
File Type: png imd.png (8.7 KB, 12 views)
File Type: png ns.png (8.1 KB, 9 views)
File Type: png thd.png (8.4 KB, 9 views)
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["Second Law is a bitch." - SY] ["The Road To Heaven:Specify the performance & accept the design. The Road To Hell:Specify the design & accept the performance"-Bruno Putzeys]

Last edited by gpapag; 25th May 2011 at 09:01 PM.
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Old 26th May 2011, 07:54 PM   #13
gpapag is online now gpapag  Greece
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Tony
You've got PM
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Old 29th May 2011, 09:28 AM   #14
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Hi George, I saw it along with about 6 others I got that day, some of the others were a bit of a surprise (in a different way to what yours was ) and I've been a bit distracted for a few days I'll return it now, I just completely forgot, I'm terribly sorry about that!

I like the transformer winding jig, simple but functional I've got to get myself some wire and wind some coils for my speakers, I hadn't yet worked out how I was going to do it, but now I at least have an idea

The orientation of the transformer really makes a big difference to the Ch1 out with the old transformer, but with the new one the difference is minimal, does the new one have a 1:1 turns ratio?

Tony.
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Old 29th May 2011, 03:05 PM   #15
gpapag is online now gpapag  Greece
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Quote:
I just completely forgot, I'm terribly sorry about that!
Tony, I have no equal when it comes to forgeting No reason to be sorry.

Quote:
I like the transformer winding jig, simple but functional
Thanks. I built it from scratch in an argent need to unwind-measure turns-rewind a burned out radio output transformer. It has provided a lot of service to me since then.

Quote:
does the new one have a 1:1 turns ratio?
No.

Old is 3.56:1
New is 2.54:1

But I already wound a bifilar 1:1 (same core as the previous two). Measurements are in progress.

Regards
George
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Old 29th May 2011, 09:45 PM   #16
gpapag is online now gpapag  Greece
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As I wrote above, I wound a third x-former using a same core.
This time primary and secondary were wound simultaneously (bifilar).
Turns ratio is 1:1. Each of them consists of 3110 turns on 66 layers.
Winding time 2 hours

Attached below are the results of manual measurements.

Two encouraging observations.
The –6db HF roll-off is at 250kHz and no resonance up to 2MHz, which is my signal generator’s limit. (This is not shown in the attachments.)
The Vpr/Vsec linearity versus signal amplitude is much better than the previous two x-formers.

Regards
George
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Last edited by gpapag; 29th May 2011 at 09:49 PM.
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Old 29th May 2011, 10:06 PM   #17
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Much more linear! also interesting is the primary to secondary capacitance, MUCH higher, I guess that is due to the bifilar winding the two wires together would be making one very long capacitor

BTW I'm surprised it only took two hours! did you actually count the turns or do you hjave a turn counter as part of your rig?

Tony.
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Old 29th May 2011, 11:22 PM   #18
gpapag is online now gpapag  Greece
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Quote:
did you actually count the turns or do you have a turn counter as part of your rig?
I count. Every some number of turns I draw a line on a paper. Then I add these lines….
I may upgrade to a higher technology though. Get myself an abacus.


Quote:
BTW I'm surprised it only took two hours!
It was two hours for winding the x-former. One more hour for winding (transferring) wire from one spool to an other (two feeding spools are required for bifilar winding), half an hour to dismantle the x-former, half an hour to clean the laminations and another half to assemble it again. A few cigarettes -no alcohol, no sex- in between.
Half an hour dipping into shellac and 2 hours baking at 100-120d Celsius. Repetitive sex during baking
A lot of afterwards

Regards
George
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File Type: jpg Picture.jpg (331.8 KB, 40 views)
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Old 30th May 2011, 09:19 PM   #19
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LOL George both at the abacus and at the extra curricular activities

Tony.
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Old 31st May 2011, 06:45 AM   #20
gpapag is online now gpapag  Greece
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Originally Posted by wintermute View Post
LOL George both at the abacus and at the extra curricular activities

Tony.
Just to make it clear, the “extra curricular” activity during baking time was in lieu of the “rent” for using my wife’s electric oven.
And that was X 3 (three x-formers).

This project has drained me off.
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