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Dual or quad secondary transformer.
Dual or quad secondary transformer.
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Old 18th September 2020, 06:00 PM   #1
mchambin is offline mchambin  France
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Default Dual or quad secondary transformer.

Are they mains transformers with two equal voltage center tap secondaries ( 6 terminals at the secondaries ) ?
Or a variant four equal voltage secondaries ( 8 terminals at the secondaries ).
This is just to know wether this is popular or asks for a custom winding.
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Old 18th September 2020, 10:01 PM   #2
Vovk Z is offline Vovk Z  Ukraine
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It's a bit hard to understand your question for me, but if understand you right: you ask about whether to order a transformer with center tap or isolated windings? The answer is usually - It is almost the same for manufacturer, so you may order a variant you need.
With center tap it is only a one wire cheaper for a manufacturer.
(As for me - I prefer isolated windings).
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Old 18th September 2020, 10:12 PM   #3
ohdsp is offline ohdsp
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If I understand you want to know if 4 winding transformers are common - either 4 individual windings or 2 center tapped windings.



I would say no. Most are 2 windings, or 1 center tapped. If you pull up something like Farnell all their parts are 2 windings. If you want 4 custom would be the way to go.



Also idividual windings are more flexible than a center tapped type.
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Old 18th September 2020, 11:51 PM   #4
mchambin is offline mchambin  France
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This means: To make a dual rail PSU,
+V Ground -V, using two identical regulated PSU, with a common transformer....The only way is a two windings transformer with two diode bridges.

The extra cost of a custom transformer is likely more than the saving on 4 diodes instead of 8.
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Old 19th September 2020, 12:06 AM   #5
ohdsp is offline ohdsp
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You can use two winding transformers with 1 bridge rectifier, just join the two windings together to give you the center tap (observing phasing), use the connection between windings as 0V/ground, then the other ends go to the AC connections on the bridge rectifier, then just one set of capacitors.


However two bridge rectifiers should be better, you can get a lot of current flowing in the "center tap" (where you join the two windings, allegedly, i've never measured it). Then join the + and - of the two bridges to give 0V.



Drawing schematics might be clearer, too many though...
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Old 19th September 2020, 01:36 AM   #6
mchambin is offline mchambin  France
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You missed the requirement: Using two identical regulators.
In other words, I do not want to use a positive regulator and a negative regulator. I want to use two regulators of the same polarity.
Then you cannot join the + and - of the two bridges to give 0V.
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Last edited by mchambin; 19th September 2020 at 01:43 AM.
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Old 19th September 2020, 11:11 AM   #7
ohdsp is offline ohdsp
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Ah yes, in that case you will need dual windings, or if you did find dual centre tapped windings you would ignore and leave the centre tap disconnected, and use in the same way.
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