Hello! I received the OPL3LPT today, but unfortunately the line(power) noise is more audible than the actual FM output (even at full volume). 😢 The line noise is there whether or not the USB power cable is connected to the OPL3LPT. The machine I'm testing on is a Pentium 3/450 MHz machine, the motherboard is an ASUS P2B board. Is there anything that can be done to remove the line noise? I have an OPL2LPT and it doesn't exhibit this problem.
do you have a 3d printed enclosure on your opl2lpt ?
--> The description sounds like the ground of the line out is not connected : Maybe the shape of your 3.5mm connector is too thick to fit through the 3d printed enclosure completely ? Maybe you have a different cable to use ?
Could you try the board without the enclosure, and fully insert the 3.5mm connector, see if the problem remains ?
Please let us know if this solves the problem.
All OPL3LPT boards were personally tested by me, on my setup. So I hope this can be resolved. I'm here to help if you have any issue.
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Thanks for your support !