I want to say what an informative and helpful site this is. I will refer to it in the future no doubt for other projects.
I am working on a project that involves tapping the data stream as it is interpreted and generated by the laser pickup unit itself.
When I say laser pickup, I refer to the unit that receives the laser light through the two way prism inside the read mechanism in most standard audio/ data cd structures.
For those who have obliterated their read heads in their personal, computer, or other cdrom devices- the item I am refering to is the clear plastic IC package, with the (usually) brown flat ribbon connector. You can clearly see the pickup device through it's clear plastic packaging. It (The IC itself) is typically a silver/ grey looking device, and very small, 1/4" by 1/8" roughly.
From the informative sticky post in this forum I gather the data that is unprocessed from the cdrom is actually more of a sin wave rather than a square wave. A friend speculated that somewhere that sin wave is processed and filtered into the familiar digital square wave. Where that occurs is yet to be discovered.
My question is this:
On the clear receiver package: there are 10 leads coming from the package and are joined on the ribbon cable. I need to know essentially the pinout for these 10 connections. By logical deduction I have guessed which one is the ground, but the rest are a mystery.
Also, through a mircoscope at 150x magnification, it is clearly visible that the majority of the surface area of the package is not photo sensitive material, but what looks to be signal conditioning (I am assuming) circuitry. IS this the case, or is the output of the package a sinusoidal waveform- I am asking so that I don't have to use an oscilloscope to check, if anyone knows.
ANY and all help is greatly appreciated.
Thank you for your time.