I want to have a 9v battery to give a 4.5v - 5v power supply?
7621
Reducing voltage with resistors
123900
How do I design a circuit for a bi-color led to display power?
138255
Different batteries connected in parallel
78058
Is there any option to store AC voltage?
31952
Regulated AC power supply?
119534
How to force variable voltage fast charging power bank to output a certain voltage?
144550
Different and opposing voltage sources?
52148
Interchanging battery with a higher capacity battery
2774
Stepping up 3V to 5V
152666
Coin cell to power a 5mm UV LED?
102576
Switch between battery and USB power
69660
Different voltage sources in parallel
39483
Is the 4-pin PSU connector required? (Trying to connect a PSU to a mini case.)
36841
Generating high voltage (100V+) from 5V USB supply
122744
Is it possible to detect a battery type and requirements(voltage,current etc) using an MCU based circuit?
423
Choosing power supply, how to get the voltage and current ratings?
91831
Using series of LM 78XX for power supply