Electronic – What are the electronics parts of a CD player

I always start my search for components on digikey; they have a fairly good interface for narrowing down the search results (for example, you can specify the package and mounting type you need). If I can not find the exact part that I need on digikey, I would visit the manufacturer's websites of the parts that the narrowed down digikey search returns.

This is the approach I have taken. It is not perfect and can be time consuming at times, but other times you can find a suitable part very quickly.

There's a variety of sources. This is, probably not the complete list, but it can give you an idea.

• Factory overruns. There are accidental overruns, deliberate overages, clandestine overruns. The problem is that you don't know if the overrun was quality controlled or not. In case of clandestine overrun, it's also not know if the manufacturer was following the process, or they were cutting corners.
• Factory rejects. When quality control decides that the tolerance is out of spec, the whole batch is rejected. Suppose that the batch of 5% resistors falls outside 5%, but within some larger number. These are still viable resistors, only less accurate.
• So called "new from the old stock". Company cleans out its inventory, which was procured through qualified channels, because they no longer use the part in their designs. The quality of such parts is normal, although shelf life may still apply.

Except for the last type, the history of the parts is usually not known, when you buy the kit.

Don't use these bargain parts in life and death matters: airplanes, cars, weapons, medical devices.