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Old 9th September 2008, 09:10 PM   #521
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Yesterday I succeeded extracting an old ATX PSU transformer. I boiled a water can for 10 minutes, turned the heat off and put the transformer inside it for 10 minutes. The ferrite core 2 halves just went off the plastic. I have some questions:

What is the material used to seal the ferrite halves together ?
Should I wind the primary and secondary in opposite directions ?
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Old 10th September 2008, 01:24 AM   #522
2pist is offline 2pist  United States
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I have used 2 part epoxy with good results. I wind both primary and secondary the same direction....
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Old 10th September 2008, 06:30 AM   #523
luka is offline luka  Slovenia
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Hi

what he said or tape, rubber band,...you name it, force doesnt need to be strong, but it would be great if mechanically strong
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Old 10th September 2008, 04:44 PM   #524
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But why boiled water was able to melt this glue, is it epoxy too that melts under such circumstances
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Old 11th September 2008, 03:03 PM   #525
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Quote:
Originally posted by metal
But why boiled water was able to melt this glue, is it epoxy too that melts under such circumstances
Only epoxy will melt, nothing else, don't know where you see any glue...
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Old 11th September 2008, 04:51 PM   #526
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remove 'glue' from 'But why boiled water was able to melt this glue'

thanks alot. coz me not know that epoxy is not called 'glue'
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Old 11th September 2008, 06:48 PM   #527
luka is offline luka  Slovenia
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Hey don't get me wrong it it glue, but super strong, say epoxy and everyone will know what you mean
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Old 11th September 2008, 09:53 PM   #528
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Now I will use your schematic for the car SMPS. What wire gauge did u use and how many wires did u twist together for the primary and secondary as well as # of turns to get 40V on each rail, I do care about ur primary winding as it's most important in this case, then secondary can be calculated.

Another thing on mind, can I use those diodes in the ATX power supply.
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Old 12th September 2008, 03:46 AM   #529
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depends on your SMPS output voltage.

the diodes on the 5V supply are rated to about 30V or so and on the 12V are a little higher. you'd need around 100V for a 35V supply.
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Old 12th September 2008, 12:21 PM   #530
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Low voltage/High current. I must refer to the datasheets of the diodes I found as well. For example, BUZ11 is easy to find, what about diodes ?
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