Schematics don’t do you much good on today’s high-tech electronics. Most high-tech electronics nowadays use custom chips or FPGAs so a schematic that shows all the signals going in and out of a magic proprietary chip won’t do you any good.
A lot of lower-tech components that perhaps use discrete parts, relays, discrete resistors, etc. do have schematics on the inside of the case or available online.
Read More: PCB Design
#PCB Design