Mains LEDs & building a powerful LED light with them
28:18
220V 30W mains voltage LED (a better one)
36:46
Pirl Charger test & teardown (4x 2.7A 5V USB)
14:12
Building DIY LED lights
16:36
Two different 30W AC mains voltage LEDs
20:55
The next generation COB LED? (Radical new style of bare LED chip.)
34:51
How I built a Mechanical Calculator
27:06
Microwave Doesn't Work? These Are The Reasons Why!
26:20