Building a car jump-starter power bank from 8 tabless Ampace JP40 cells

Teaching you the 8-cell car jump starter

I built a ‘New Year atmosphere machine’? If your village had a voice-controlled remote firecracker toy like this, would you stay home a few more days over the New Year

Ep. 66 | How to hand-build a portable desktop mini drill press? Build a DIY maker's own desktop drill press that can even drill into rebar

Second version of my low-cost DIY soldering iron: upgraded to Li-ion power plus a printed shell, more convenient to use

Building a car jump starter from supercapacitors + lithium cells — the cells store energy, the supercapacitors deliver the big current; 21700 4000mAh cells in 2P4S, 2.7V 360F supercapacitors, two together should push past 100A instantaneous, CCA estimated 500+, should start a 2.4L car; final assembly and test next

Hand-built monster fan

Ep. 31 | Very ‘open for business’, good morning, a workhorse’s daily grind, energy +1 — hand-building a 2S2P flashlight pack for the Wurkkos SP10 and other 8.4V flashlights

Ultra-low-voltage coilgun: the most powerful coilgun with the least copper

Ep. 178 | The welding pen’s lead blew up on me before, mates. On a viewer’s recommendation, it gets a jacket — feels a lot safer

Building a lithium-powered electronic magnifier to hunt for gold inside chips