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From: JosephKK on 4 Oct 2009 07:46
On Wed, 30 Sep 2009 13:31:23 -0500, Vladimir Vassilevsky
<nospam(a)nowhere.com> wrote:

>
>
>Jan Panteltje wrote:
>
>> On a sunny day (Wed, 30 Sep 2009 10:26:16 -0700 (PDT)) it happened mkr5000
>> <mikerbgr(a)gmail.com> wrote in
>> <6710fdbd-7150-4c96-a548-6f0477a43177(a)g19g2000yqo.googlegroups.com>:
>>
>>
>>>I'll be darn -- don't know why I haven't considered that before and
>>>for
>>>a power amp you don't want a regulated supply.
>>>
>>>Is the added ripple a problem?
>>
>>
>> No problem, that chip has good supply rejection, typical 70 dB.
>
>BTW, 70dB is not much at all for audio purposes.
>
>There is a problem. The consumption of the audio amp is not symmetrical.
>There is going to be significant DC current in the transformer, and the
>rail voltage unbalance as well. I would unrecommend using that kind of
>voltage doubler for audio power amp. Use the traditional diode bridge
>with center tap, or the single supply bridged amp topology.
>
>Vladimir Vassilevsky
>DSP and Mixed Signal Design Consultant
>http://www.abvolt.com

Well one end of the transformer is connected only to capacitors, how
do you get a DC current in the transformer?
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