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Chip Amps Amplifiers based on integrated circuits

Toroidal Transformer Hookup Sticky
Toroidal Transformer Hookup Sticky
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Old 13th February 2009, 05:46 PM   #1
snknby123 is offline snknby123  United States
diyAudio Member
Join Date: Aug 2006
Smile Toroidal Transformer Hookup Sticky

For some reason I have a problem when it comes to reading the schematic and hooking up transformers. Dual primaries/secondaries which set gets connected where, parallel or series etc. Don't even include a center tap or I'm done for sure.

For us noobie's that may be in the same boat would it make sense if we had a sticky that everyone could list:

xformer Brand
VA rating
Primary config
Secondary config
Center tap?

Maybe even more info like your setup and if it hums, don't like it or whatever.

Here are mine:

(2) Avel Lindberg 250VA 2x25v Dual Primary and Secondary

Primaries: Purple/Blue go to AC Hot and Grey/Brown go to AC Neutral. Using them with chipamp's brds with dual mono block and rectifiers. These have an audible hum and one was DOA. Bought from parts express.

(2) Antek AN-4225 400VA 2x25v Dual Primary and Secondary

Primaries: Red/Red go to AC Neutral and Blk/Blk go to AC Hot. Currently using one with audiosector's dual mono block and rectifiers with premium components. These are large. I ordered 300VA but they sent me 400VA cuz they were out of stock. They also have a slight hum at startup then is barely audible. Ok build quality and are cheaper at $45

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Old 13th February 2009, 09:32 PM   #2
JohnnyP00 is offline JohnnyP00  Canada
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Join Date: Nov 2007
I have an Antek as well and thought Red would be AC hot
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Old 13th February 2009, 09:38 PM   #3
snknby123 is offline snknby123  United States
diyAudio Member
Join Date: Aug 2006
Not according to their Tech support guy. THe said red to neutral and that's the way I currently have it hooked up and it's working but i guess that doesn't mean he's right.

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Old 13th February 2009, 10:04 PM   #4
Moose is offline Moose  Canada
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Join Date: Apr 2004
Location: Vancouver, B.C.
It shouldn't matter which one goes to hot and which one goes to neutral so long as you are consistent between the two primaries.

To wire for 230V you would wire the black from the one primary to the red of the other primary, and then connect the two remaining leads to AC hot and AC neutral.
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