30:00

Using salvaged lithium cells to power LEDs directly. (with protection test)

24:00

Test of the Yihua 502D USB bench power supply. (With fix!)

20:16

How to Calculate the Correct Resistor for LEDs Light Emitting Diodes

12:10

Inside a different car ozone generator - with schematic

33:58

Every Component of a Linear Power Supply Explained (while building one)

24:52

What if all the world's biggest problems have the same solution?

22:49

I bought 1000 meters of wire to settle a physics debate

23:51

Hacking an extra trashy Poundland LED lamp (with schematic)