snowsh
Well-known member
As part of my soon to be revealed project, I am working on a circuit that offers both 5 pin DIN MIDI and 3.5mm TRS jack conectors. I have a load of TRS switching jacks which are readily available.
Please take a look at the attached schematics. I am second guessing myself as I am not sure I have pins 4 and 5 correct on the 5 pin DIN. Also if you notice any glaring errors in the optoisolation on the MIDI in and the use of the hext inverter to protect the MIDI outs.....
I am also going by the pin out of the TRS that 5 is the tip, and 2 is the sleeve. I will endeavour to test this tomorrow....
Re the 74HC14 hex inverter, I ported this approach from the tSynth project, I suppose the idea is to use two passes on a hex inverter to offer some level of protection... As well as USB midi, my project offers 1X Serial MIDI in and 2X serial MIDI out connectors using both 5 pin DIN and these switching TRS connectors. By using the TRS the DIN socket is bypassed.
the jacks are: https://www.amazon.co.uk/HALJIA-Socket-Headphone-Stereo-Connector/dp/B07422MCSX
I have gone with MIDI TRS type A as this is suggested to have become the defacto standard as mentioned here: https://minimidi.world/
Thoughts?
Please take a look at the attached schematics. I am second guessing myself as I am not sure I have pins 4 and 5 correct on the 5 pin DIN. Also if you notice any glaring errors in the optoisolation on the MIDI in and the use of the hext inverter to protect the MIDI outs.....
I am also going by the pin out of the TRS that 5 is the tip, and 2 is the sleeve. I will endeavour to test this tomorrow....
Re the 74HC14 hex inverter, I ported this approach from the tSynth project, I suppose the idea is to use two passes on a hex inverter to offer some level of protection... As well as USB midi, my project offers 1X Serial MIDI in and 2X serial MIDI out connectors using both 5 pin DIN and these switching TRS connectors. By using the TRS the DIN socket is bypassed.
the jacks are: https://www.amazon.co.uk/HALJIA-Socket-Headphone-Stereo-Connector/dp/B07422MCSX
I have gone with MIDI TRS type A as this is suggested to have become the defacto standard as mentioned here: https://minimidi.world/
Thoughts?