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Old 8th June 2005, 02:58 AM   #1
diyAudio Member
Join Date: Apr 2005
Location: Simcoe Ont
Default Pls help me understand transformer

I studied this stuff in school 20 years ago. That makes me a newbie. My transformer has output as follows:
RedA + RedB= 48V
RedA + Black= 24V
RedB + Black =24V
WhiteA + Yellow =16V
WhiteB + Yellow =16V
WhiteA + WhiteB =32V
I tried other combinations and got different voltages, these were the obvious patterns.
I would like to use this power supply for bipolar 18V, 48V for phantom power, 5V and if I am fortunate, bipolar 15V for other ICs.
First I would like to understand the trans, then please suggest next step.
Thank you
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Old 8th June 2005, 04:55 AM   #2
Stocker is offline Stocker  United States
diyAudio Member
Join Date: Dec 2003
Location: Austin
You have a dual-secondary transformer, or at least dual-voltage secondary.

red/black/red is 24V-0V-24V or 48V with a center tap
yellow/white/yellow is 16V-0V-16V or 32V center tapped.

red is relative to black and to the other red. You can use either set of wires to use the voltage on them. Note that if you use the red-red voltage it will be only positive; if you use the red-black voltages it can be positive or negative or both. Similarly the yellow/whites.

Rectified, the DC voltage can be either 0.707 or (more usually) 1.414 times the voltage AC off the transformer. This tranformer seems suitable for any of the voltages you mentioned, if a voltage regulator is used.
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Old 8th June 2005, 06:41 AM   #3
diyAudio Member
Join Date: Apr 2005
Location: Simcoe Ont
Default Power supply

So I can take the red red, that can be rectified and will give me 48VDC but will be higher and needs to be regulated?
The yellow white yellow will goive me +-15 but actually higher after rectifying and will have to be regulated to 18V?
Is that correct?
What is my next step?
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