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FantomXR

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Posts posted by FantomXR

  1. Hi and welcome to the forum!

    Well, to be honest I can not believe, that a ribbon cable with this length stops working completely. 

    Are you sure that the ribbon cable has the correct orientation? I made this mistake often in the past. In general it's a twisted cable (one connector looks up, one connector looks down, cable straight).

    Pictures might help!

  2. Although I have a RTP-OEM I will not use it in this case. 

    I’ll use 2xGM5, which gives me 10 MIDI I/Os in total. 

    I found that page which shows an easy way, how to transform MIDI into Ethernet and back to midi:

    https://www.edn.com/design/consumer/4368054/Send-MIDI-signals-over-long-distances

    Only a few parts are needed. Seems to be perfect because I still have some pins on the Ethernet-connector left to also transmit +5V and GND. 

  3. At first we should discuss the sense of that board. Should it be a pin-compatible replacement for the Core8? If yes, the feature-list is fixed. 

    Adding SMD-optos is no problem. My MIDI-PCB is already full-SMD. 

    Regarding PCB-manufacture: I order my PCBs at elecrow with very good results! So I'd suggest them. 

    You asked me about 3V3: The PCB has a 3V3 power plane as well as a GND plane. 

    In the wiki you wrote, that a programmer is needed. If I assemble those PCBs I'd program them with the MIOS bootloader so you don't have to do it. 

    I'll have a look into my designs and see if I can upload another eagle-file which contains the newest core design (with SMD crystal, etc.)

    If having a small footprint the the main-goal in this design we should think about replacing the IDC headers with micromatch-headers. Smaller footprint and smaller connector-type on the cable-side. 

  4. I took a look at the Core8 and I'd say that it should be possible to create a PCB with the STM with that size and the same pinout. Not sure if it makes any sense though. 

    Anyway: If we want to use my pick & place machine it's good to have 5 PCBs or more of the same type at the same type. 

    Are you guys familiar with routing and creating PCBs? Who wants to do it?

  5. To be honest I can not follow you.

    I improved the design which I published here and used that in my other designs which I don't want to make open source.
    For example I changed the oscillator to SMD, I changed all none-VDD-traces to 0.2032mm, I changed all vias to round-style and 0.32mm diameter. I removed the ID-pin from USB. I added an inductor behind the USB connector for EMC-improvements. Also I changed all 0603 SMD parts to 0805.

    Those are a few changes I made in my other designs. 

  6. Since I just received the PnP machine last week I don't have enough experience yet to give you informations about prices.

    But yes: The PnP machine places all SMD parts which are not too high f.e. electrolytic capacitors. I didn't try double-side-partmounting yet. 

    Regarding your comments:
    I use external optocoupler for MIDI I/O
    Micro-SD Slot is on the back of that PCB
    J6 & J7: I made some pcbs with faders which I connect directly to that connectors. 

    There is no "current" version. It's a proof of concept, which worked. So I used the circuit around the STM provided in this design here in my other projects.

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  7. The sense behind this layout is just a proof of concept. My goal was to have an alternative to the discovery board. This design shows the minimal circuit which is necessary to get the STM running.

    This is why I left out almost all connectors from the original Core-Board. My goal was not to recreate a replacement because for my usecases the original board has tons of features I don’t need. 

    With that said: you are invited to take the layout and adapt it to your needs. To be honest most of the connectors should be straight forward pin-to-pin routing from the STM. 

  8. Great to hear that it works! 

    I’m not at my computer at the moment. I’m not sure what kind of SD connector I used in that layout. I can look it up tomorrow. 

    Either it is one that is called TF01 and I bought a bunch of them from Seeed-Studio but as far as I know they are not available anymore. That’s why I changed the connector to a Molex-Connector which is available at Mouser. I’ll look it up for you. 

    Anyway: since the pinout is straight forward it is very easy to replace the connector in the design! 

  9. Hi frank,

    you won’t change the resolution by changing the keybed. You will get the same results. The problem is the NG firmware. So if you need a higher resolution, than go with KB. I use it and it works great. 

    BTW: you can still use the break is make function by sending a SysEx command to the KB core. 

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