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4hv.org :: Forums :: General Science and Electronics
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Transformer Questions

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Steve Conner
Wed Jun 19 2013, 11:28AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		The gap will just make the magnetizing current a bit bigger than it would be otherwise. It'll probably still work fine.
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Patrick
Wed Jun 19 2013, 05:00PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
currentkills91 wrote ...

I figured as much, I dont have anything handy I could use to grind it down, I have a toroid core that would work if I had to use it.

Is there any good places to buy ungaped E cores?



what material is the toroid made out of?

I have several toroids that are powdered metal, and have an equivalent distributed air-gap...so be careful.
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currentkills91
Wed Jun 19 2013, 06:27PM
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
 		The core was from the power transformer in the amp so I imagine ferrite.
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Patrick
Wed Jun 19 2013, 10:15PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
currentkills91 wrote ...

The core was from the power transformer in the amp so I imagine ferrite.
can you see ferrite? do you know what mode the transformer was operated in?

there are distributed gap, powered metal cores... these will have the same horrible magnetizing current as a physically gapped core.

I presume you have already read the TI/Unitrode SMPS pdf files...
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currentkills91
Wed Jun 19 2013, 10:27PM
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
 		The power supply in the amp was a push pull setup, its a dark green colored so I can't actually see anything.
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