120/240V to logic level optoisolator (with schematic)
42:18
Using the 555 Timer
21:41
Tutorial: How to design a transistor circuit that controls low-power devices
11:10
The Best Protection for your Circuits? eFuse! Here is why they are awesome! EB#48
9:56
Cheap PIR movement sensor and switch - with schematic
10:57
Testing AliExpress "mystery solder"
18:07
How Optocouplers work - opto-isolator solid state relays phototransistor
13:49
Opto-Couplers Theory and Circuits
24:14