Relays! They're Electromechanical Switches.
23:18
How many different ways can we cause trouble in the 5XB?
19:03
The Machine that Makes Your Phone Ring
12:08
Self Winding Master Clocks in Central Offices
8:21
Electronic Basics #32: Relays & Optocouplers
6:09
Turns Ratio and Induced Voltage - Transformer Coils
41:36
Why isn't the 1XB completing calls?
16:07
Test Your Electronics Smarts - Guess The Electronic Parts!
13:16