- Joined
- Aug 13, 2001
- Location
- Bergen, Norway
After visiting this site, I decided to try out making a CD ROM digital out to optical.
Some specs first:
CD ROM digital out is a 5V TTL output (SPDIF, or COAX digital use 1V p-p signaling)
Optical digital devices are "tuned" to see red light, with 630nm as minimum wavelenght.
So, I found the drawing of the "Super-cheap TOSLINK Module" on the page, and after going through my drawers, and 15 minutes of preparation and soldering, I was done!
So I turned
1 reset switch (cut of the switch, used the connector and the cable)
1 bright red 3mm LED (1.7V)
1 140 ohm resistor
some solder and shrink tubing
into
CD ROM digital to TOSLINK optical!!
It's fascinating, because the optical interface works at several MHz, so all you see is a constant red light. Put it into the optical input, and suddenly this red light comes back as music!
And by removing some of the "lip" at the base of the LED, it even fits the optical input directly. Neat.
Here's the pic:
Some specs first:
CD ROM digital out is a 5V TTL output (SPDIF, or COAX digital use 1V p-p signaling)
Optical digital devices are "tuned" to see red light, with 630nm as minimum wavelenght.
So, I found the drawing of the "Super-cheap TOSLINK Module" on the page, and after going through my drawers, and 15 minutes of preparation and soldering, I was done!
So I turned
1 reset switch (cut of the switch, used the connector and the cable)
1 bright red 3mm LED (1.7V)
1 140 ohm resistor
some solder and shrink tubing
into
CD ROM digital to TOSLINK optical!!
It's fascinating, because the optical interface works at several MHz, so all you see is a constant red light. Put it into the optical input, and suddenly this red light comes back as music!
And by removing some of the "lip" at the base of the LED, it even fits the optical input directly. Neat.
Here's the pic: