In Case You Missed It
Aero ‘lectrics
Jim Weir presses the venerable LM317 variable voltage regulator (plus a few other parts) into service as a way to juice up a discharged battery.
Home Machinist
Let’s take it to the edge. Where is the edge? If, up to now, all you’ve done is scribe a target and eyeball the position of the drill bit, this is for you. By Bob Fritz.