First post, by spark2k06
I designed a new low profile OPL3 sound card from the scheme provided by the existing TexElec Resound OPL3 in which, as you can see, it is a four-channel sound card based on the Yamaha's YMF262 chip and use of two high quality WIMA film capacitors per channel to prevent the passage of direct current in the audio output.
In this case, I thought that with the two primary channels it is more than enough. On the other hand, I have replaced the port selection DIP with one of 2 switches, to select with the help of an SPLD only four possible ports, including the default 388h used by Adlib and the 220h to "cheat" some games pretending to be a Sound Blaster ... I think the rest is too much and they are still purely experimental, with this measure I also gain some space and eliminate other chips involved in this task:
As you can see, I have also decided to make it internal regardless of the external audio jack in order to be used in current PC cases that have the typical USB + Audio connector on the front, so that a bracket is not necessary , being enough with one of the blind brackets that come standard with the box.
I have launched with this project to provide a sound card to my NuXT Monotech tucked into a low profile desktop, although it could be used in any other PCXT and compatible.
Version 1.2 Kikad project available here.
Warning: For now, I am deleted Kicad sources from repository. Only available schematic in PDF format, in the same way as Texelec.
