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Old 7th November 2006, 12:08 AM   #1
bal704 is offline bal704  United States
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Default Power Supply Transformer

I'm getting ready to start on the LM4780 kit from AudioSector.

http://www.audiosector.com/lm4780.shtml

I happen to run across a pair of 24V transformers, but they only have single secondaries. Is there any way to get it these to work for this circuit, or do I need dual secondaries?
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Old 7th November 2006, 01:48 AM   #2
Sherman is offline Sherman  United States
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Default Re: Power Supply Transformer

Quote:
Originally posted by bal704
I'm getting ready to start on the LM4780 kit from AudioSector.

http://www.audiosector.com/lm4780.shtml

I happen to run across a pair of 24V transformers, but they only have single secondaries. Is there any way to get it these to work for this circuit, or do I need dual secondaries?

You can use two transformers that have single secondaries. Just use one trafos secondaries for the AC1 H&N and the other secondaries for the AC2 H&N.
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Old 7th November 2006, 03:13 AM   #3
CarlosT is offline CarlosT  United States
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Bal where did you see the single secondary transformers? Were they toroids?
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Old 7th November 2006, 12:13 PM   #4
bal704 is offline bal704  United States
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I bought them locally. They are Mercury Magnetics 24V transformers. I've attached a pic.

Also, if I have to use 2 of them, can I connect both xfmrs to the same AC plug, or will each xfmr need it's own?
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File Type: jpg xfmr.jpg (9.0 KB, 255 views)
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Old 7th November 2006, 03:01 PM   #5
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You can use one line cord to power both transformers. You should also install a fuse. Be careful about getting the line cord "polarity" correct.

The nature of your question leads me to believe you have never wired anything like this before. I recommend that you find someone local to you who has some experience with this sort of thing and have them check your work before you connect power to it.

Test your power supply before you go to the trouble of building and connecting the amplifier circuit.

Good luck!

I_F
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Old 7th November 2006, 03:52 PM   #6
bal704 is offline bal704  United States
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Thanks for the help. This is my first PS project, and I intend to build and test it before I hook it up to my amp.

Thanks again
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Old 7th November 2006, 05:27 PM   #7
CarlosT is offline CarlosT  United States
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What do you do if the tranny has dual 115V primaries? I just wanna run 115V coming in...
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Old 7th November 2006, 05:29 PM   #8
CarlosT is offline CarlosT  United States
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BTW I just found a super deal on Avel Lindberg encapsulated toroidals...90VA 20V+20V 7% regulation for $20 each. Would this make a decent transformer for a single LM3875?
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Old 7th November 2006, 05:31 PM   #9
bal704 is offline bal704  United States
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Where did you find that deal? Send a link.
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Old 7th November 2006, 05:34 PM   #10
CarlosT is offline CarlosT  United States
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No link...email me if you're interested cdtres@mindspring.com
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