Laser Tuning (PC Engine Duo) Updated Mar 15, 2026 · 27 min read · 0 viewing Log in or register to read the full article. Previous Audio Circuit (PC Engine Duo) The PC Engine Duo has a sound system that mixed audio from various sources. I have yet to reverse en... Next Laser RF Amp Circuit (PC Engine Duo) This article takes a deeper dive specifically into the laser diode and photo diode part of the laser...