So here it is: the COSDB (seems that abbreviations are hot in classD
).
I've been looking at this forum for the past 10 years, and never before has so many classD-designs been available for us amateurs. But a lot of these designs apparently don't care about EMC, EMI and switch mode-circuits.
Chokoholic's thread here: http://www.diyaudio.com/forums/class-d/224052-systemd_2kw-any-interest-open-design.html looks like the most thought-through and ambitious project so far. I have no doubt that Chokoholic have forgotten more about classD than I'll ever know, but I still dare to present an alternative to his fantastic effort.
I'm thinking that "we" need a platform to experiment with classD. The platform I envision shall strive to meet these points:
I've done preliminary schematic and PCB-suggestion. I'm not sure that I'll find the time to actually build the amp, but the design-process is fun as well.
I'm hoping that all the knowledgeable members here will chime in and perhaps someone will make a few PCB's to verify the function.
We can never design a PCB that will fit every need or cater for every wish, - that's simply not possible with classD because space around the critical components are so limited.
The component-values on the presented schematic is not final. Some of them are probably way off. At this stage we are focusing on the connections in the schematic as these will dictate PCB-design.
[IMGDEAD]http://i49.tinypic.com/30shlit.png[/IMGDEAD]
PCB will follow if there is any interest.
Regards
I've been looking at this forum for the past 10 years, and never before has so many classD-designs been available for us amateurs. But a lot of these designs apparently don't care about EMC, EMI and switch mode-circuits.
Chokoholic's thread here: http://www.diyaudio.com/forums/class-d/224052-systemd_2kw-any-interest-open-design.html looks like the most thought-through and ambitious project so far. I have no doubt that Chokoholic have forgotten more about classD than I'll ever know, but I still dare to present an alternative to his fantastic effort.
I'm thinking that "we" need a platform to experiment with classD. The platform I envision shall strive to meet these points:
- TO220 mosfets on underside of PCB
- Only tracks on bottom of PCB. Top reserved for GND plane(s)
- Lots of SMD. 0805 minimum
- Best possible layout with regards to EMC, but still homemade
- Regulated supply for mosfet-driver and modulator
- Daughter-PCB's for: modulator, protection and Mosfet-driver
- Usable up to +/-65V, 10A minimum
- Usable as "real amplifier" but focus on development and learning
I've done preliminary schematic and PCB-suggestion. I'm not sure that I'll find the time to actually build the amp, but the design-process is fun as well.
I'm hoping that all the knowledgeable members here will chime in and perhaps someone will make a few PCB's to verify the function.
We can never design a PCB that will fit every need or cater for every wish, - that's simply not possible with classD because space around the critical components are so limited.
The component-values on the presented schematic is not final. Some of them are probably way off. At this stage we are focusing on the connections in the schematic as these will dictate PCB-design.
[IMGDEAD]http://i49.tinypic.com/30shlit.png[/IMGDEAD]
PCB will follow if there is any interest.
Regards
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