I hope this question is in scope for this site.
While I was just about to throw away my very old internal CD Writer (PATA Interface) in E-Waste, I saw two pins on its extreme left back panel interface mentioning DIG ( D G being Pinouts) on it.
See the snapshot, the next one right to it is a 4 Pin Audio interface and next to that is Master/Slave/Cable Select pins.
Does anyone know what was this DIG? There’s absolutely no reference of it on the internet.
Digital Out. This is how it's labeled on my CD writer:
Google "cd spdif 2-pin" and you'll find suitable cables.
It is digital out. The digital auto out has both channels encoded and passed along one wire pair.
Not sure why it is labeled D/G--perhaps so you don't think you can connect it to an analog receiver--but it is signal and ground. The analog audio connector requires a pair for each channel, and it is labeled Right, Ground, Ground, Left. In reality, most analog audio connectors I have seen use a shared wire for ground so the connectors usually only have 3 wires.
Digital audio output for connecting to a sound card. Back in the day it (or the analogue equivalent) was required to play CD audio through computer speakers
DIG = digital (audio output). D = data G = ground. Protocol should be compatible with S/PDIF standard, however electrical interface cannot be directly connected to any standard equipment. Signal output from CD have TTL or TTL-3v3 standard. This signal can be attached directly to any standard TOSLINK emitter but You need to add 5V supply or amplifier. This signal can be also converted to coax S/PDIF connector (signal level +/- 0.7V). Minimal set of parts include only two resistors and capacitor. Recommended set includes buffer (any logic gate).
