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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.
    permalink
    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
    permalink
    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.
    permalink
    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.
    permalink
    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
  8. Old Comment
    Tea-Bag's Avatar

    Salas Board Minikits and Full Kits

    Quote:
    Originally Posted by Liliya
    Hello Teabag

    I intend to build a a positiv shunt regulator for my miniDSP 4x10. I have not had time to readt he hole thread, but as far as I can see, there have been some changes from the first version. As I have both 2SK170BL(and PF 5102), IRF240 and IRF 9240, I do hope that all this component can be usedand do the changres according to you first version?
    The transformer I have is 11.8V AC and 108VA. MiniDSP 4x10 work properly from 6V DC to 15V DC. I want to go for the max version that can handle 3A. Can all my "wishes" be realized. I need your advice before starting up this prosject and ordering the PCB.

    Eivind Stillingen
    I think using the DCB1 board, gives you a lot more flexibility here.
    permalink
    Posted 31st July 2016 at 01:48 PM by Tea-Bag Tea-Bag is offline
  9. Old Comment
    alexcp's Avatar

    First Watt B1 clone

    Hi Marc, sorry I was away from diyAudio for a few months. Thank you for the positive comment. To your question, I did not source the relay selector but designed and built it myself - there is not much to design there, so it was mostly soldering.
    permalink
    Posted 30th July 2016 at 02:43 AM by alexcp alexcp is offline
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