LTC and mb-6582 question

MIDIbox SID
1

hello

i want to ad a midi thru to my 6582…

so let’s for a part of ltc but i need just the minimal parts …

if i understand i keep ic3+j4 and j1…do i have to keep ic2 ?

thank you

2

You need only a 74LS14, 2 x 220 Ohm Resistors. Thats it :wink: Look Attachement

[midi-thru-1.pdf](< base_url >/applications/core/interface/file/attachment.php?id=948)

[midi-thru-1.pdf](< base_url >/applications/core/interface/file/attachment.php?id=4090)

3

I once bypassed the two NOT gates… i.e. connected the output of the optocoupler directly to the 220 Ohm resistor of the MIDI Thru jack. It worked… I did loopback tests with a PC via this MIDI Thru port and didn’t get any errors. My theory was, if the optocoupler output could drive the PIC’s Rx pin (which doesn’t actually draw much current at all) then it could probably drive another optocoupler at the other end of a cable attached to a MIDI Thru port.

It works, but the buffers are a better idea and the right way to do it.

4

thank you Pascal and Wilba

i will experiment next week…