Hey all, sorry about the delay. I've uploaded a preview video of my homemade Arduino YM2151 here (also has some chill background music); turn on captions if you have trouble hearing me, and keep in mind I mistakenly say "ampersand" when I clearly mean "exclamation point." I'll be uploading my sketch and Fritzing soon, just gotta finalize the wiring to fix any looseness.

cool.  will do. Ill try to check it out this weekend

@Charbot
I added a Workaround for the Sysex Bug at the Github page. (https://github.com/masl123/YM2151-Midi-Controller)
Let me know if this works.

thanks a lot for this translation Ruizer!!

see this... https://drive.google.com/file/d/0B7jpRX … sp=sharing

From what I've seen, the pieces available at https://sites.google.com/a/ooishoo.org/www/ym2151shield are not the same, right?
Another thing, how to make the PDF manual available that I translated?

For what it's worth, the original Ishii downloads can be found at his old Googlesite.

Please do. Last time that i checked, all the links on the japanese site were no longer working.

btw, the parts on mine is exactly the same as on the japanese schematic.

Tks Charbot, I'll be waiting for a possible update of the schematic or list of components. Another thing, I translated the manual available at http://www.ooishoo.org/ym2151shield for English PDF, if you find it interesting, I can make it available to the forum.

yeah, just use the lone out jacks... wasnt sure if you were keeping them.

Id connect the amp right at the jack, after the caps.

Moi?   Ill try to check my github soon.  apparently there is at least one other error with the stuff i posted.

Hello everyone, I'm starting my YM2151 + Arduino world and I really like this forum. I'm trying to build a PCB based on the Arduino Pro MINI as suggested. However, I did not find the parts list complete. In one of the images available, has almost everything, but some resistors and capacitors are missing, can they help?

Yea, I'm Fritzing-ing the board currently and will GitHub the cleaned up code after.

Re amplifier - would it connect directly to the 3 OUT and 4 OUT of the op-amp or does it need to be after the capacitor like the stereo jack?

Re line out - wouldn't the existing stereo jack and circuit work for line out or would I need a different jack and circuit?

Great.   You should post your final schematic and code.

You will prob want an amplifier of some kind to drive a speaker (effectively).   Personally, Id have at least a line out jack on there too, for  if you every wanted to record or perform/play at any volume

Update: I got it to work!!!! I had read the MSX expansion sound card SFG-01/05 schematic today (here, here, here, here) and the key wiring difference between the SFG schematic and previous incarnations of the Arduino/Raspberry Pi YM2151+YM3012 schematic I've read (especially any based off the original design) is the wiring to the op-amp.

Basically, other than the photocoupler wiring which is apparently used for the MIDI input that would drive activation of the overall circuit, every non-SFG schematic had one significant thing different from the working SFG-based approach I used: the YM3012-to-op-amp connection was wired differently.

Every non-SFG schematic had op-amp 1 output bridged with op-amp 1- and one connection to YM3012 pin 13 (V/2 or MP) bridged with pin 14 (BIAS1 or BC). YM3012 pins 9 (ch 1) and 10 (ch 2) connected to op-amp 3+ and 4+ through resistors in series, with capacitors as noted.

The SFG had both sides of the YM3012-to-op-amp 1 connection unbridged, op-amp 1 output to YM3012 pin 13, and op-amp 1- to YM3012 pin 14. YM3012 pins 9 and 10 connected directly to op-amp 3+ and 4+ without any resistors in between, with relatively no change to locations of capacitors in the circuit.

Regarding the op-amp-to-audio output, I found that one could get similar working results by either connecting the final capacitor's ground to the audio output's channel in series or by grounding that capacitor and instead connecting the final resistor to the audio's channel. In practice, I could not perceive any significant difference in resulting audio volume through the headphones.

So! After connecting the membrane button strip, my final step before eventually putting everything into the piano housing is to connect the audio output to speakers. I have two 4 ohm 3W piezo speakers that as of yet do not work with the circuit I as I currently have it. How should I fork the op-amp's output to successfully play through the speakers? Do I need an external amplifier circuit like this MAX98306 I bought from Adafruit and if so what's the recommended wiring from the op-amp to the MAX98306?