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RE: What's the advantage?

Posted by Michael Koster (M) on September 29, 2009 at 14:55:19

In Reply to: RE: What's the advantage? posted by 6AS7_6SN7 on September 28, 2009 at 23:43:08:

"Last but not least, you can use economic AC mains transformers (the same as for linear power supply) instead of expensive audio transformers (because of the perfect balance of the bias current)."

You're not mentioning the downside of off-line operation; for example:

What's the voltage test/isolation rating on your input transformer? Most of the low level transformers I own are rated/tested at 500VDC. What kind of isloation would be required for agency approvals if you were going to make this as a product, and how would that impact the cost? How would it impact the signal quality aspect of the input transformer, e.g. coupling, inductance, voltage headroom, frequency response in circuit?

What other construction is necessary to double isolate the exposed case and user controls, and how does that impact cost?

Cheers,

Michael

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