January 2022 Updates

Added info on ICs which have different part numbers for different I2C addresses.

Added a /pcb-design/castellation/photo of a castellated daughter board inside a Logitech G810 mechanical keyboard.

Created a new page on current sources and sinks, including a Zener/BJT current source and constant-current diode (JFET current source).

Added JFET schematic symbols. Added JFET info on transconductance and dynamic resistance.

Created a new page on Wheatstone bridges.

Condensed all the temperature sensor sub-pages into the temperature sensor page.

Added a page on termination (electrical termination of transmission lines), including schematic examples of series termination.

Added more info on the SOIC component package, including the SOT-162-1 NXP synonym.

Added info on the SOD-123EP component package, a variant of the SOD-123.

Added info on monitoring loop time to the page on firmware superloops.