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tebl / BulkyMIDI-32

A HW build of the MT32-PI project, allowing you to emulate a Roland MT-32 using a Raspberry Pi. Includes enough additional modules to build a MIDI-mountain as well as adapters for connecting to most things retro.
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About expanding additional THRU ports #5

Open zwrr opened 1 month ago

zwrr commented 1 month ago

Thank you for creating this project. I have used the Input Switch module and combined it with the MT-32 Pi into one unit.

Now I have a problem and hope to get your help. There are 3 THRUs in your design. I use them for the built-in MT-32 Pi and two external connections MU90 and SC-88PRO. I recently got the SC-55 and SC-55MKII, and there are no extra THRU ports available.

According to your design drawings and the information of 74HCT14, can I use the four idle pins 1, 2, 3, and 4 of 74HCT14 to manually expand the additional two THRU ports?

I am a beginner in circuit design and hope to get your help. Thank you.

midi-2 midi-1

tebl commented 3 days ago

I'm sure that you've figured it out by this point, I'm not always up to date on what's going on everywhere. As for the two extra gates, you need to pull the the inputs (1 & 3) out of the socket and run a wire to pin 10. You'll need four 220 Ohm resistors when connecting up the connector pins. That's a really cool build btw :-)