Here you will find a selection of help cards that I've created over time. I've printed these out and laminated them and I find them of great personal benefit especially now my memory is starting to go on the blink.
Resistor colour codes
Basic logic element truth tables and equiv. IC numbers and symbols
ESR (Equivalent Series Resistance) table
(C) Joe Farr, 2011 - 2017 - Email: HobbyElectronics@kcsl.uk.com