I saw a post on Reddit a while ago about someone who made a stencil for drawing organic chemicals. I always lamented how crappy my resistors looked during my electrical engineering class so I decided to make a quick stencil!

It is a standard credit card size and features a resistor, inductor, capacitor, diode, transistor, op-amp, ground, and battery symbols.

I designed the symbols to work with a 0.5mm mechanical pencil, and they all are based on a 5mm grid so it should look good on most engineering paper.