Charts and Tools
The reference tables everyone ends up needing at step three of a project, plus two tools for when you don't know what you're holding.
What component is this?
A few questions about shape, markings and legs, and the mystery part in the drawer has a name.
Ohm's law wheel
The classic twelve-formula wheel, drawn big and tappable.
AWG wire chart
Diameter, resistance and how many amps each gauge carries, from AWG 4 to 30.
Standard resistor values
The E12 and E24 series, and why 470 exists but 450 does not.
Capacitor conversion table
pF, nF and uF lined up so you stop counting zeros, with the common codes.
Schematic symbols
What every squiggle in a circuit diagram means, in one place.
Battery sizes
From AAA to 18650 to coin cells: voltage, capacity and where each one shows up.
Made to print
Each chart fits on one page and prints clean in black and white, because the inside of a parts cabinet door is still the best reference display ever invented. The values come from the published standards, not from someone else's blog table.