Connecting LEDs to 4.5 volts in parallel
127515
Is it OK to put LEDs in parallel?
134426
How do I convert, lower, or raise voltage?
62968
OR-ing power supplies (diode or mosfet)
151190
Line level voltage to drive LED display
113480
Using voltage divider in a circuit
129553
5V to 3.3V Level shifting circuit
65409
Help to join 3 resistors in parallel into 1 (power equation?)
104718
What happens if I connect 24V to 5V push switch?
100157
Running 2 5V USB battery power packs, Can I use them in parallel
28361
How can I drive 12v LEDs from my Arduino Nano?
126022
How to add ground to DC circuit?
33777
home socket with DC voltage
4030
Do I really need resistors when controlling LEDs with Arduino?
152666
Coin cell to power a 5mm UV LED?
17263
How to drive 128 LEDs
151478
Calculating resistor for LEDs with different Forward Voltages in series
70745
Connecting two DC wallwarts in series - to produce dual DC supply