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In the Forum: Melquiades Amplifier
In the Thread: Building Melquiades: Chronicle of full-range
Post Subject: Re: Amateur things and grounding of secondary.Posted by hagtech on: 6/24/2006
 Romy wrote: |
| ...what is your view about grounding of secondary in output transformer? I keep secondary lifted in the Super Melq as I have in there 6 phase switching relays... |
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Not sure I understand. You run the speakers floating from ground? Are you doing polarity swithing on the outputs?
First, it just doesn't seem right to me to phase switch the amplifier outputs. I'd rather do it to the inputs. Not sure I like the relay contacts on the larger currents. Of course it works. I just wonder what is being lost.
Second, I don't know if it's bad to float the outputs. Seems like maybe there will be some common mode issues. Maybe noise injection or some HF instability. Possible feedback of external noise source reflected back into primary. My personal preference is to run balanced secondary. Or more specifically, a center tap to ground (or some earthly reference). I like the balanced transmission of signal. This too, reduces any common mode interactions. I think grounding one amplifier output is a mistake brought on by cost considerations. Unfortuantely, it is near impossible to find an output tranny with the right characteristics. But to float? I wonder if you can get charge buildup or some other wierdness.
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