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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: What's re the smaller TX's for? (NT) posted by Owen on June 18, 2002 at 05:00:15:
What's the point of balancing the signal after it's already entered the chassis? .. Simple man, it gives you choice, if half your inputs are balanced, and the other unbalanced, then you route one set through a transformer to drive the either balanced or unbalanced TVC..Except that the TVC's input is inherently balanced (floating) and can be driven directly from either a balanced or unbalanced source. In other words, there's no separate configuration of the TVC for balanced or unbalanced sources.
I paid a visit to Sowter's web site and Brian has updated the application schematics for the TVC which includes a configuration using an added input transformer. The purpose of the added transformer isn't to balance the signal after it's entered the chassis, but rather for improved common-mode noise rejection at the primary input.
The Sowter TVC has rather poor common-mode noise rejection, only 50dB at 50Hz. Using a dedicated input transformer in front of it such as Sowter's 3575 would provide better input common-mode noise rejection than could be achieved with the TVC alone.
Sowter doesn't give any common-mode rejection specs for their 3575, but a good input transformer should be able to offer upwards of 100dB or more of common-mode noise rejection.
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Follow Ups
- Re: What's re the smaller TX's for? (NT) - Steve Eddy 09:53:29 06/18/02 (0)
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