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50w rms into 8 ohm load amplifier circuit using single dc power supply

Discussion in 'Audio' started by Jemz143, Oct 17, 2018.

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  1. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    The last couple of days I've been designing a circuit where I needed to work to ensure I'm staying inside the SOA for some components. Given that there is a significant possible range of values such as Vgs(th) I needed to do just that to ensure the circuit will not only continue to work, but won't self destruct with an unfortunate combination of parts. I'm not sure I'd ever see the extreme cases, but it's comforting to know that operation is somewhat guaranteed.

    I don't do this all the time, but sometimes you really need to.


    May 20, 2017
    It always pays to design for worst case. Which should include an appreciation of the limitations of the components you hope to use.

    Edit: Another useful tool is the Failure Modes and Effects Analysis (FMEA) which forces you to analyse your design in minute detail and to try to predict what might happen if a component fails and what its effect might be on the rest of the circuit.
    Almost every time I performed one, it resulted in a modification of some kind. They can be quite tedious but in the long term can save a lot of embarrassment and preserve job security.
    The analysis process is also a good starting point when you come to write up your design and develop any necessary set up and test procedure.
    Last edited: Jan 5, 2019
    hevans1944 likes this.
  3. hevans1944

    hevans1944 Hop - AC8NS

    Jun 21, 2012
    Well, if you are in the somewhat fortunate position of designing something that will be replicated in million-lot or greater quantities (cell phones come to mind), you really do need to. Recalls (like paybacks) are really expensive.
    (*steve*) likes this.
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