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Silly? question about Triad split bobbin transformer
Silly? question about Triad split bobbin transformer
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Old 27th September 2019, 09:44 PM   #11
mchambin is offline mchambin  France
diyAudio Member
Join Date: Mar 2011
The data sheet tells wiring in parallel or wiring in series.

It doesn't tell leave some winding unused.
I see no advantage to do so. And the datasheet tells to not use them independently.

I would follow the datasheet.
Primaries in // for 110V mains, in series for 230V mains.
Secondaries in // for 5 V, in series for 10V ( with center tap 5V 0V -5V )

Silly ? YES, the datasheet is perfectly clear.
Transistor junction temperature is not transistor case temperature.

Last edited by mchambin; 27th September 2019 at 09:51 PM.
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Old 27th September 2019, 10:24 PM   #12
eduard is offline eduard  Netherlands
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Join Date: Sep 2002
Location: Holland
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Like i have written before i was expecting a higher voltage by creating a 5V that can supply 6A with a load of only 2A.
But problem is solved.
greetings, Eduard
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Old 3rd December 2019, 03:55 AM   #13
gorgon53 is offline gorgon53  Finland
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Location: Finland
I guess it is a core type transformer and therefore both windings must be used.
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Old 3rd December 2019, 10:48 AM   #14
mandu is offline mandu  Singapore
diyAudio Member
Join Date: May 2010
You ignore the data sheet. It only show the connection possibilities from the terminals. Connect the primary as per data sheet. Series or parallel. This is must. You can have the secondary in series or parallel or use only one or use each of the two secondary windings to different application. No harm. Just do not exceed the current rating of that winding. Regards.
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Old 3rd December 2019, 11:06 AM   #15
wg_ski is offline wg_ski  United States
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Join Date: Oct 2007
Do not exceed the voltage rating either, which implicitly is the end to end voltage of one of the secondaries. Do not get tempted, for instance, to power the heater of the rectifier tube off one and a rectifier and regulator for a DC heater for output or line stage tubes off the other. That puts B+ between adjacent turns and will result in a fireball, eventually. You could power two separate low voltage circuits off of it, provided both never got far above ground and that high isolation (including noise) was not required. The manufacturer still makes no guarantee the two circuits will remain isolated, and if it concerned safety in any way it would not get certification.
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