• Beginz


    I am reasonably new to this, and I am trying to find the calculations used to choose the component values in this circuit.

    Concerning the Optocoupler( an article about optocoupler: http://www.apogeeweb.net/article/69.html), from what I can work out:

    6N139 Forward Voltage = 1.4V Supply Voltage = 5V

    so: 5-1.4/220= 16.36mA through the optocoupler.

    But the MIDI standards state that it should be 5mA current loop?

    Also, how was the other values calculated? Thank you

    posted in technical issues read more

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