Posted: Sun Jan 29, 2017 6:35 am Post subject:
Opl3 player module Subject description: a synth for my synth
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.
Have been playing around with this new module. As for the hardware it's nearly finished, but the software is another story
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.
schematic opl3 6-2-17.JPG
This image has been reduced to fit the page. Click on it to enlarge.
first 20 sec is a TLC274, next 20 sec is a MCP6044 and last 20 sec is a MCP6284 output stage
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You cannot attach files in this forum You can download files in this forum