Cleaned the iMac G3 analog board and one of the resistors covered in goo disintegrated! What can I do? (400MHz iMac DV Summer 2000) : r/VintageApple
Diode Module | How does it work? - YouTube
Wireless Audio Transmitter Circuit using IR LED & Photo Diode | Wireless Audio Transmitter Circuit using IR LED & Photo Diode | By SR Electric | Facebook