preenfm Forum

PreenFM => preenfm2 and preenfm3 => Topic started by: Mmarsh on June 23, 2014, 08:25:00 PM

Title: Built a new one :)
Post by: Mmarsh on June 23, 2014, 08:25:00 PM

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

Title: Re: Built a new one :)
Post by: tIB on June 23, 2014, 10:27:28 PM

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?

Title: Re: Built a new one :)
Post by: Mmarsh on June 24, 2014, 12:14:59 AM

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...

Title: Re: Built a new one :)
Post by: Mmarsh on June 24, 2014, 07:50:13 PM

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...

Title: Re: Built a new one :)
Post by: Xavier on June 24, 2014, 09:11:33 PM

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

Title: Re: Built a new one :)
Post by: Mmarsh on June 24, 2014, 10:38:10 PM

Perfect Xavier, thanks! I will check the diode and double check all components tonight.