HEY! Those ARE lifehacks since they are MASSIVELY used electronic knowledge.
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List of my Power Supplies:

Keysight E36313A: https://www.keysight.com/us/en/produc...
Keysight EDU36311A: https://www.keysight.com/us/en/produc...
ITECH ITM7721: https://www.circuitspecialists.com/it...
Circuit Specialists CSI3010SW: https://www.circuitspecialists.com/cs...
Batteries… whatever batteries! Get your own batteries!

By: Mehdi Sadaghdar

0:00 Intro to Electronic Power Supplies
2:38 Schematic Symbols for Power Supplies
3:53 Ideal Voltage Supply
4:47 NonIdeal Voltage Supply
6:07 Equivalent Resistance/Impedance for Series Circuits
6:52 Voltage Divider Circuit
7:54 Ideal Current Supply
8:22 NonIdeal Current Supply
9:22 Equivalent Resistance/Impedance for Parallel Circuits
10:20 Current Divider Circuit
11:19 Thevenin and Norton Circuit Models