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Hello there,

I like electronics, DIY, computer stuff and I thought it would be nice to share my useless hobbies. Just because ‘useless’ often means ‘fun’.

By the way, I’m French, so I can sometimes have a bad English. 😉

Have fun with silicon!




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  1. Ryan Gibson / Oct 26 2011 2:26 pm

    Hey Oryx,

    Great blog. Loving the posts. Do you have an email address I can catch you on? I have a few questions to ask you.


  2. andymanone / Jul 30 2012 4:12 pm

    Hey Oryx,
    first of all a wanna say: Great job! Well done :o)!!!

    So i´ve there a question too ;o):
    the used optocoupler (U5) for the MIDI section, is it an 4N33?
    Is it fast enough, cause i heard, that most of all other prefer e.g an 6N139?

    Regards, andY

    • Oryx / Jul 30 2012 4:28 pm

      Hi, thanks for your comment. 🙂

      I use a 4N35. It’s not the fastest optocoupler, but it is cheap and fast enough for MIDI applications.
      Its maximum switch time is 10µs, so the maximum signal frequency is 1/(2*0.00001) = 50 kHz, which is more than the 31250 bauds of a MIDI signal.

      It works fine with the ATMega USART, maybe you need faster optocouplers with some microcontrollers.


  3. andymanone / Jul 30 2012 4:35 pm

    Hi Oryx,
    thanks for your fast response :)!

    Ahh okay good to know! And as I can see it´s indeed really cheap 🙂
    Thanks for the good hint!

    Best regards,

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