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Old 8th December 2002, 03:23 PM   #11
Rarkov is offline Rarkov  England
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It is not easy to build a class d from discrete components. Firstly, you need an extremely fast sawtooth or triangle wave. That usually requires an opamp at least. You need a comparator to generate the PWM there's another high speed opamp. After that you need under/over sampling protection etc etc and then you have the discrete output that all the circuits have. In other words you still have to have chips unless you make up discrete opamps...but these are not really in the signal path (apart from the comparator). You shouldn't really take noise into consideration (by comparing discrete/chip) since you are totally dismantling the signal anyway! You will get far better results from an H-bridge driver or dedicated Class D driver...and it'll be a whole lot safer!

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Old 9th December 2002, 08:30 AM   #12
hacknet is offline hacknet  Singapore
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i will look into class h
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Old 9th December 2002, 09:38 AM   #13
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hi hacknet

The subwoofer-modules i meant in an earlier post are made by the German manufacturer RCM Akustik.
They seem to be quite cool (in more than one sense) but they don't come cheap.
The 300 Watt one is about 300 Euros for example.
look under Products => Detonation => Datasheet


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Old 9th December 2002, 08:12 PM   #14
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Mueta chips looks very interesting for electrostatic loudspeakers.
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