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 Forum index » DIY Hardware and Software » Developers' Corner
Opl3 player module
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Grumble



Joined: Nov 23, 2015
Posts: 1174
Location: Netherlands
Audio files: 29

PostPosted: Sun Jan 29, 2017 6:35 am    Post subject: Opl3 player module
Subject description: a synth for my synth
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I'm working on an OPL3 player module.
Started ordering a few YMF262 Yamaha FM chips, which have been used in a lot of synthesizers in the 80ties. Along with these YMF262 I ordered some DAC chips YAC512.
The module is far from ready, but the basics work, I can select from 128 instruments and have them played frm the internal midi and gate.
Todo is to have the ext. midi to work so I can play from a polyphone keyboard or ext. sequencer.
Also I want to be able to change the instrument parameters so I can fiddle around with the sound of the instruments.

Here a link to my OPL3 player:
https://youtu.be/-WvVVEAcwWw


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Grumble



Joined: Nov 23, 2015
Posts: 1174
Location: Netherlands
Audio files: 29

PostPosted: Mon Feb 06, 2017 3:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

Have been playing around with this new module. As for the hardware it's nearly finished, but the software is another story Rolling Eyes
Originally I put a MCP6044 quad opamp in this module, but it sounded terribly.
I didn't realized that an opamp could make such a difference in a simple circuit like the output circuit of this module.
So I made an audio file with three opamps: first the TLC274, the MCP6044 and last one the MCP6284.
The MCP6044 (that's the most "expensive" of the three 1.75€) is the worst qua sound, while the MCP6284 (the cheapest, 1,39€) sounds the best to me...
Also I am asked for the diagram of this module, so I added it as well.


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three_opamps.wav
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first 20 sec is a TLC274, next 20 sec is a MCP6044 and last 20 sec is a MCP6284 output stage

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OP3 player.pdf
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lazarusr



Joined: May 08, 2017
Posts: 1
Location: London, UK

PostPosted: Mon May 08, 2017 10:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Really nice project. A while back, I made a 'sound card' for the BBC Micro (British 8-bit 6502 computer from the '80s) based on the YM3812 (OPL2). Details here: https://github.com/lazarusr/BeebOPL and some sample tunes here: https://soundcloud.com/user-469563483/sets/beebopl-1

I am now working on a similar project using the YMF262. Although, not going as smoothly as I had hoped.

I'd love to see any updates on your OPL3 module. Also, would you be prepared to share your Arduino source code?
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Grumble



Joined: Nov 23, 2015
Posts: 1174
Location: Netherlands
Audio files: 29

PostPosted: Tue Sep 08, 2020 2:54 am    Post subject: Reply with quote  Mark this post and the followings unread

IT's POLYPHONIC (6 voices)


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my synth
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Blue Hell
Site Admin


Joined: Apr 03, 2004
Posts: 23378
Location: The Netherlands, Enschede
Audio files: 261
G2 patch files: 320

PostPosted: Tue Sep 08, 2020 7:09 am    Post subject: Reply with quote  Mark this post and the followings unread

cool!
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Jan
also .. could someone please turn down the thermostat a bit.
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