Reference sheet
Every symbol the app draws, with its designator letter
The symbols every diagram in this app is built from (IEEE 315 style — zigzag resistors). The designator letter is how parts are numbered on a schematic: R1, C3, D2… A junction dot means connected; a plain crossing means the wires just pass each other.
AbbreviationsSMD, BOM, ESR, PTH: the jargon on datasheets and fab files
dBm powerDecibel-milliwatt to watts, and what each level means
ResistivityHow well common materials conduct
SI prefixesPico to giga, with the factors written out
Screws & standoffsM2 / M2.5 / M3 sizes and the mounting holes on common boards
Sensor pickerWhich sensor for temperature, distance, light or current
Serial protocolsUART, I2C, SPI, CAN and friends: wires, speed, reach