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  1. Old Comment
    abraxalito's Avatar

    Chinese class D amp modules.

    If you're playing music (not continuous duty sinewaves) then a crest factor of at least 12dB seems reasonable, hence for a 500W amp a 50VA transformer will suffice. Agreed its still fairly heavy and bulky.
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    Posted 27th August 2016 at 05:12 AM by abraxalito abraxalito is offline
  2. Old Comment

    Chinese class D amp modules.

    An OPT is not practical in my ap. I want to keep the weight down and traffo's aren't cheap or compact at 500 wrms!
    Hopefully someone has managed to snuff out the RFI without killing the high end frequency response. My guess is that a dual choke 3rd order filter is a must have. There dozens of these Chinese modules and Alibaba. If you haven't already guessed it, my audio background is pure analogue
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    Posted 26th August 2016 at 01:41 PM by Stage Sound Stage Sound is offline
  3. Old Comment
    abraxalito's Avatar

    Chinese class D amp modules.

    I use output transformers, this is primarily to improve the SQ but also has the desirable side-effect of reducing the EMI.
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    Posted 26th August 2016 at 06:07 AM by abraxalito abraxalito is offline
  4. Old Comment

    Chinese class D amp modules.

    You might start a thread about this in the Class-D forum. That is likely to get more responses than a blog post...
    permalink
    Posted 25th August 2016 at 04:50 PM by CharlieLaub CharlieLaub is offline
  5. Old Comment
    davym's Avatar

    Exploring laptop sound

    Was a cure for this ever found?
    permalink
    Posted 13th August 2016 at 04:12 PM by davym davym is offline
  6. Old Comment
    rjm's Avatar

    RJM Audio discrete op amp (circuit schematic)

    Thanks. Nice diagram, I appreciate having all the voltages written on there. Yes, I expect if I put the current sources back in to my circuit I will end up with something very similar. The main difference in the topology is just that my version has a follower/buffer before the VAS.
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    Posted 8th August 2016 at 05:35 AM by rjm rjm is offline
  7. Old Comment
    permalink
    Posted 8th August 2016 at 05:15 AM by FritzS FritzS is offline
    Updated 8th August 2016 at 05:31 AM by FritzS
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