STK-0050 replacement for SX-780 and others

Discussion in 'Pioneer Audio' started by rcs16, Jun 18, 2016.

  1. Awesomeaudio

    Awesomeaudio AK Subscriber Subscriber

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    1100 pages too !! Wow.
    That'll keep you busy for a while :D
     

     

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  2. larryderouin

    larryderouin Turn it UP, POP? PLLUUEEEZZZZZEE Subscriber

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    Yeah but 40% are PICTURES and they don't count.....unless you happen to be an ex-Torpedoman, Boatswain's Mate, or a Bloody MARINE!:D:D:D

    ( this Hospital Corpsman is going DEEP below the Layer and Silent Running!)
     
  3. rcs16

    rcs16 Super Member

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    Thanks dr! Have been looking for something like this for a while. And the price is right!

    I went through it, it covers a lot,nice addition to the library. basically what I learnt in college in the late 70-80's. Still are making 7400/4000 series logic, cpu's have come a long way. all good info to know, if it applies to what you are doing.
    As far as audio amplifier design books, go to Bob Cordell's new book, pay the $, it is worth every $, if you are serious about understanding this topic. it will be out soon, that and ltspice simulator, the defacto standard these days for linear design.

    That is how I did this STK-0050 design, ltspice and orcad. I have never made one for myself, all virtual, it is cool and rewarding to be able to do it and share it with the world. :)
    Cheers to Zeb for stepping up and making them available to everyone.
     
    Last edited: Jun 7, 2018
  4. merlynski

    merlynski Curmudgeon Electronicist Subscriber

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    Rick, attached is an SX-580 sim for STK-0050 from LTSpiceXVII. It was adapted from another of your sims. The output is way overdriven (square wave) but produces no errors or complaints from LTSpice when run. If you get the inclination to run it . . . :)
    I put the tone controls' components in the schematic because they are integrated into the power amp stage negative feedback loop, but may not be necessary to the simulation. I used two equal resistors to emulate the (centered) tone control pots.
    AK would not let me upload the .asc file, so I zipped it.
    Enjoy, and thanks for your work!

    EDIT: P.S. Please verify I subbed the correct transistors . . .
     

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    Last edited: Jun 7, 2018
  5. rcs16

    rcs16 Super Member

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    That is great Merlyn.
    I changed the level for Vin1 to 0.17 which is just below clipping. VR3 to around 110 ohms. So it works fine imo.
     
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  6. zebulon1

    zebulon1 Getting behind on work. I need help? Subscriber

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    Rick had sent a ItSpice sim to help me detail the larger watt version. I’m going to make time to learn this tool.
     
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  7. merlynski

    merlynski Curmudgeon Electronicist Subscriber

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    Made those changes in my sim and got the same result :thumbsup:
     
  8. merlynski

    merlynski Curmudgeon Electronicist Subscriber

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    FWIW, the SX-680 PA connection to its STK is identical to the SX-580's. Somebody asked in a previous post asked if the STK-0050 upgrade kit could be used there.
     

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