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Old 5th October 2012, 12:01 AM   #121
AJT is offline AJT  Philippines
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use whatever is available to you as long as it is thick enough for the job...

as you deviate from the square core cross-section and the more rectangular it becomes, then the mean length per turn becomes longer and with it the resistance of the winding goes up, but this is mitigated somewhat by the fewer turns required with bigger cross-section magnet wire....

use of insulation varnish after the built up traffo is good, the varnish not only insulates the windings but also goes in between the laminates and this reduces eddy currents as well....what i do is to dip the built up traffo into a bath of varnish lifting it up when bubbles dissapear, this is done at least three times.....
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Old 5th October 2012, 02:02 AM   #122
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Ok, that great
you just point it out right what I need
now my hesitation has gone...
This time good transformer is the final result
I will built it slowly so the varnish cure & the trafo can be used instantly


Thank you Tony
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Old 5th October 2012, 03:58 AM   #123
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tony, the winder you are using on the phils website seems
to be different to the one photographed here. The one here
is better, it seems sturdier ?
Can you remember specifically where you got it ?
How come you don't attach a small motor using gears or something
so it would free up your other hand ?
Thanks
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Old 5th October 2012, 04:47 AM   #124
AJT is offline AJT  Philippines
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Quote:
Originally Posted by JOHN BALI View Post
Ok, that great
you just point it out right what I need
now my hesitation has gone...
This time good transformer is the final result
I will built it slowly so the varnish cure & the trafo can be used instantly


Thank you Tony
you can pretest yout finsihed traffo right after completing it to see that all voltages are ok.....and then you can dip the whole thing in varnish....

it is better to wait 3 days if using air drying varnish....
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Old 5th October 2012, 04:59 AM   #125
AJT is offline AJT  Philippines
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Quote:
Originally Posted by donnyab View Post
tony, the winder you are using on the phils website seems
to be different to the one photographed here. The one here
is better, it seems sturdier ?
Can you remember specifically where you got it ?
How come you don't attach a small motor using gears or something
so it would free up your other hand ?
Thanks
yes, i have 2, one is with a digital/mechanical read-out, but i dumped it because it had a tendency to stop counting in the middle of a winding run.....really annoying...

winders like those are easily available in RAON in Manila for about U$20 you can have one...

i like the dial wheels better, and quite accurate too...the two winders are same size really...

i have plans to motorize it, but too lazy at the moment...
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Old 31st December 2012, 05:38 AM   #126
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Hi, It is more than a year...
I don't finnish anything yet, sorry
I hope next year that can be done...

Happy New Year to all people here
hope Goodwill to you

Best Regards

John
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