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Old 9th January 2006, 09:23 PM   #1
Jonhny is offline Jonhny  Sweden
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Default Transformer/rectifier wiring

I have a transformer with 5 wires. Two mains, a centertap and the two hot wires. 2x27 VAC
Can I wire it and the rectifiers/caps in a way that I get 27x1,41~1x38 VDC with as much current as possible?
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Old 9th January 2006, 09:26 PM   #2
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you could use a full wave rectifier (two diodes) but the current capability will be severely compromised..
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i am currently using 60,000 uF of capacitance in my preamplifier..
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Old 9th January 2006, 09:55 PM   #3
K-amps is offline K-amps  United States
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Why not parallel the secondaries to double the current at 27vac? Perhaps I misunderstand your question...
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Old 9th January 2006, 10:16 PM   #4
Jonhny is offline Jonhny  Sweden
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Since it is a center tap and I can't access the two windings seperatly I don't know exactly what to do. If I put the two hot wires together I'm pretty sure there will be a fire since they are out of phase.
Double full-wave bridges with outputs connected?
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Old 9th January 2006, 10:21 PM   #5
K-amps is offline K-amps  United States
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Pardon me, you are correct, here in the US, most of the new Toroids come as dual sec windings which you rig up for Center tap OR parallel connection. I do know that some are hardwired as a center tap. I just made a few Toroid connections in my projects and was in "that" frame of mind.

Cheers.
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Old 9th January 2006, 10:27 PM   #6
Jonhny is offline Jonhny  Sweden
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I'm used to transformers with seperated wires too, but this one is free so I can't complain. Worst case scenario is that I have to open it up and see if I can get another wire out of it.
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Old 9th January 2006, 10:56 PM   #7
lineup is offline lineup  Sweden
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I found a webpage
that gives formulas for different possibilities
to make DC out of transformer.

Formulas is to decide what is minimum rating for trafo
when you need a specific DC voltage and max current.

These formulas can be rewritten to give you resulting DC voltage
and max Current for a given Trafo and method of rectifying.

Also if you use a filter capacitor will effect result.

Transformer VA Calculations

Quote:
Half Wave Rectifier (HWR)
Full Wave Center Tap (FWCT)
Full Wave Bridge (FWB)
Dual Complementary Rectifies (DCR)
Adding A Regulator
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Old 9th January 2006, 11:02 PM   #8
K-amps is offline K-amps  United States
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Quote:
Originally posted by lineup
I found a webpage
that gives formulas for different possibilities
to make DC out of transformer.

Formulas is to decide what is minimum rating for trafo
when you need a specific DC voltage and max current.

These formulas can be rewritten to give you resulting DC voltage
and max Current for a given Trafo and method of rectifying.

Also if you use a filter capacitor will effect result.

Transformer VA Calculations

Good page! I put it in my favs.


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Old 9th January 2006, 11:17 PM   #9
Jonhny is offline Jonhny  Sweden
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Thanks!
The full wave center tap is not that bad, at low voltages at least. Guess I will try it.
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Old 4th February 2006, 09:02 AM   #10
Cortez is offline Cortez  Hungary
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I have a shield copper-foil layer on the primer, and the core has also a wire for grounding.
Where should I connect these wires ? To the earth on the primer side, or to the GND on the secunder (DC) side ?
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