V-grooves that go most of the way through a PCB are one way to go about this, but a line of perforations along which to snap a tab is another. But what’s the best size and spacing of holes to use?

Earlier this year [Skyhawkson] got ahold of an Apollo-era printed circuit ... to make up a differential amplifier. He is right I believe, and if he got that by just glancing at the PCB photos ...

PCB Design Software allows you to design circuits using resistors ... Next up, we have a free online PCB design software. The best part about this is the fact that it is online.