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Quick transformer question
Quick transformer question
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Old 20th August 2019, 12:47 AM   #1
Windcrest77 is offline Windcrest77  United States
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Default Quick transformer question

For these Antek torroids, would I hook the yellow and white together to make a 200-0-200 center tap transformer? I'll use the variac.

http://www.antekinc.com/content/AS-1T200.pdf
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Old 20th August 2019, 01:27 AM   #2
Tjj226 is offline Tjj226
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Yes, yellow and white go together to form your center tap.
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Old 20th August 2019, 01:37 AM   #3
rayma is offline rayma  United States
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Make absolutely certain (with an ohm meter) that the two wires you connect together are from different windings. Otherwise a winding will be damaged and ruin the transformer.
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Old 20th August 2019, 03:14 AM   #4
Windcrest77 is offline Windcrest77  United States
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Thanks I was gong to run a few volts ac with the scope to double verify the phases of each winding.
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Old 20th August 2019, 03:25 AM   #5
rayma is offline rayma  United States
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Great idea. To be safe you can use a signal generator set to 60Hz, with 1k resistor in series.
The colors will be correct for phase, but sometimes which pair make up one winding isn't so clear.
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Old 20th August 2019, 02:52 PM   #6
Windcrest77 is offline Windcrest77  United States
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Quote:
Originally Posted by Tjj226 View Post
Yes, yellow and white go together to form your center tap.
After asking this I decided to make the power supply fully dual-mono for L/R channels, rather than the shared CT supply full-wave the schematic specifies. Since this torroid has two secondary wingdings I'll just use a bridge and CLC on each and have two isolated supplies for each stereo channel. With no extra space needed for another transformer. Same for the DC filaments. Might be better separation I suppose (theoretically).

Come to think of it I kind of like having two identical secondary's rather than a center tapped transformer. You have more options, use them separately, in series for a CT, or in parallel to increase the current rating.

I'll have to rework the voltages for a bridge.

Last edited by Windcrest77; 20th August 2019 at 02:56 PM.
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Old 20th August 2019, 04:02 PM   #7
Tjj226 is offline Tjj226
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Join Date: Dec 2012
Quote:
Originally Posted by Windcrest77 View Post
After asking this I decided to make the power supply fully dual-mono for L/R channels, rather than the shared CT supply full-wave the schematic specifies. Since this torroid has two secondary wingdings I'll just use a bridge and CLC on each and have two isolated supplies for each stereo channel. With no extra space needed for another transformer. Same for the DC filaments. Might be better separation I suppose (theoretically).

Come to think of it I kind of like having two identical secondary's rather than a center tapped transformer. You have more options, use them separately, in series for a CT, or in parallel to increase the current rating.

I'll have to rework the voltages for a bridge.

Let me know how that goes, I have considered doing the same thing a few times.
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