New user here so hi everyone!
I am making several lights with a number of LEDs (around 25-60) that I am powering with a single cell li-po.
My first question is, will this circuit work and be efficient ....
A 3.7V single cell li-po connected to a small single cell mini USB li-po charger. Those connected to a DC-DC converter (MP2307) to smooth the voltage out. Then from that going to rails for the LEDs. Apparently you can use caps and voltage regulators but those are less efficient and obviously more hassle.
My second question is that I can change the output voltage of the DC-DC to exactly the forward voltage required by the white LEDs so when I put those figures into a resistor calculator it says to use a 1 Ohm resistor. Does that sound right? If I was to use red etc LEDs it would be like 20 Ohm so if I had the LEDs alternating red/white/red/white I would just use the corresponding resistors off the V+ rail for each LED?
I hope that makes sense, please let me know if there is any other information you need.
Many thanks in advance,
Ollie.
I am making several lights with a number of LEDs (around 25-60) that I am powering with a single cell li-po.
My first question is, will this circuit work and be efficient ....
A 3.7V single cell li-po connected to a small single cell mini USB li-po charger. Those connected to a DC-DC converter (MP2307) to smooth the voltage out. Then from that going to rails for the LEDs. Apparently you can use caps and voltage regulators but those are less efficient and obviously more hassle.
My second question is that I can change the output voltage of the DC-DC to exactly the forward voltage required by the white LEDs so when I put those figures into a resistor calculator it says to use a 1 Ohm resistor. Does that sound right? If I was to use red etc LEDs it would be like 20 Ohm so if I had the LEDs alternating red/white/red/white I would just use the corresponding resistors off the V+ rail for each LED?
I hope that makes sense, please let me know if there is any other information you need.
Many thanks in advance,
Ollie.