preenfm Forum
PreenFM => preenfm2 and preenfm3 => Topic started by: Mmarsh on June 23, 2014, 08:25:00 PM
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Built the latest version Preen with metal case. Build was easy, the case comes together nicely. It sounds wonderful, maybe a little better than the original FM2? Smoother?
One issue: I can't get MIDI in to work through the DIN connector. USB works very well, nothing through MIDI DIN. I switched the opto coupler and OpAmp originally, so I also tried another coupler (the one from my other Preen) with no luck.
Any thoughts?
Thanks,
Mike
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Im sure you have checked this already but its worth mentioning that the midi in and out are the opposite way around to that of the plastic case- ie the panel legend for in is wired to out if you follow the build thread. You tried plugging into the other one?
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I think I did at one point because the labels on the headers were confusing. But I didn't with the new optocoupler. Good call, I'll try it again tonight...
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No joy. Xavier, can you post a diagram of the wiring from the MIDI DIN connectors to the headers on the board? I'm not sure I could really see that from the pictures in the manual...
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Hi Mike,
Here is a quick picture i just made.
Let me know if that helps.
If you can take picture of both your jack and PCB with the header and a close view of the area around the optocoupler.
A wrong diode direction would also prevent the Midi in to work.
Xavier
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Perfect Xavier, thanks! I will check the diode and double check all components tonight.