Can I use a 12V and a 5V line from a PC power supply to get a safely useable 7V
141150
Undervolting PC Fan from 12V to 7V
132950
Scale 30-50 mV signal to 0-5 V range
146748
How can I tell if an AC adapter is compatible with my laptop?
91243
What are the highest DC and AC voltages or currents that can be considered as safe?
91831
Using series of LM 78XX for power supply
23833
Can I use a power adapter with more current but lower voltage on another laptop?
134426
How do I convert, lower, or raise voltage?
131932
How to create bipolar power supplying from Powerbank 5V 3A
91437
Amplifying 10-30mV into at least 5V
423
Choosing power supply, how to get the voltage and current ratings?
95931
What is Analog and Digital supply voltage
37100
Using a higher current charger on a laptop which requires a lower current
72043
Automatic switching between external 5V and USB bus power supplies
44127
What are the ways to make a dual power supply from a single voltage source?
49235
Does a power supply draw only as much power as it needs?
64645
Is it possible (and safe/reliable/non-damaging) to use a 20-pin ATX PSU with a 24-pin ATX motherboard?
106741
Find the power supply hardware information for a PC using Ubuntu's command-line