I am regularly sending ordinary people to look a the application sections of the datasheets for several electronic parts if they want to know how a part should be used. As I was laying out the motor boards for the weekends workshop I came across the following in the datasheet for the L239(not d) clone that Texas Intruments puts out.
Can you tell where the chip begins and the diagram ends? Can you tell that the diodes are (not really) included in the chip or would you add them to your parts count.?
I nearly panicked and relayed out everything with 8 general purpose diodes and ordered the parts before I was able to ascertain (incorrectly) that the diodes in the diagram above are actually integrated into the chip.