Transistorgrab

Some people draw their schematic symbols strait according to the pin arrangement of the component.
For explanation they say this prevents confusion during layout when signals are on a different location then in the schematic.
But the schematic is the “Source code” for the layout design. It needs to be drawn in a way to be read fast and unambiguously to enable that mistakes in connections can be spotted easily. For this it helps to prevent wire crossings where ever possible.
368

Diodes are often used to realize inverse-polarity protection. For circuits with high input currents the forward voltage of the diode can lead to a very high power dissipation of the inverse-polarity protection.

42

Z-Diodes are often used for simple voltage stabilized circuits. It is very important to use the Z-diode with the correct parameters.
This article shows an example for the voltage characteristics of two Z-diodes.

28