Audio connectors:
There are three 3.5mm jack sockets mounted beneath the Joystick/MIDI connector. Starting
on the left is the Stereo Line-out (headphones), middle is Stereo Line-in, and on the far right
is the Mono MIC socket. The line-out output has sufficient drive to be able to fully drive
70mW into a standard 32 Ohm pair of stereo headphones while still maintaining correct
voltage levels when driving into a high impedance "line-in" of an external amplifier. The
Line-in input feeds stereo audio from an external sound source to the Audio codec where it
may be sampled or mixed with the other sound sources. The Mic input will drive either a
mono electret, carbon or moving-coil microphone and feed it's input to the input Audio
codec for sampling or mixing. When using a carbon or moving-coil mic, the extra
microphone gain stage may need to be enabled to compensate for the lower signal levels of
these types of microphone.
The sockets take standard 3.5mm jackplugs with the following pinout:
LINE-OUT / HEADPHONES
Tip
Left Audio out
Ring
Right Audio out
Sleeve
GROUND
LINE-IN
Tip
Left Audio in
Ring
Right Audio in
Sleeve GROUND
87
