Which chip and whatever happened to Mueta and UCD? - Page 23 - diyAudio
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Class D Switching Power Amplifiers and Power D/A conversion

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Old 20th July 2004, 07:32 AM   #221
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That's true, I've no idea what kind of value Cc would need to be, will try simulating in a day or so but all the same..

Sounds like a nice way to make your speaker up btw.

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Old 20th July 2004, 07:49 AM   #222
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If you want to bridge two UcD's, tie a 47nF cap between the outputs. The amps will synchronise quite nicely.
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Old 20th July 2004, 08:00 AM   #223
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Old 20th July 2004, 01:51 PM   #224
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This topic talks about Mueta and UCD, i think the last one is pretty good when i look to all the posts about it and i will certainly try one in the future when i learned more about all the (for the moment to me still difficult) things about it.
But what happened to SODA?
I made a SODA for myself (based one an existing one), like i said in another topic, and it performed pretty good.
I read about the good output filter correction and everything round this of the UCD.
Has the SODA much other disadvantages then the UCD?


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Old 20th July 2004, 02:03 PM   #225
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In black box terms indeed the main difference lies in how output filter control is handled (first soda: only fb at the switches, 2nd soda composite feedback, ucd only fb after the filter).

Since then, the power stage has become a bit more practical too. It uses only N-fets, and you can turn it on and off at will (this is entirely normal for circuits with IC drivers, but for a number of reasons, mainly cost, driver ICs were not an option).

(for information to the other readers, soda typically used an LM311 comparator, an emitter follower pair as driver, ac coupling with zener DC restoration and a P/N pair. Needless to say startup of this circuit was a bit tricky)

Sonically speaking, soda cooks up a nice sounding "soup". With UcD you get the ingredients
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