Leds Warm
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electronic circuit help?
ok so i wanna make a circuit consisting of 20 LEDs in a row a switch and a battery of sum sort. Now can anyone tell me wat transistors il need size wise i just cant work it out also a battery that will power the circuit for up to 2+ hours the LEDs are warm white in colour also il be needing a circuit with 10 and maybe LEDs
By "in a row" do you mean in series? That's not a good idea as each led drops about 3.5V, so for 10 you'd need 35V and for 20, 70V.
Assuming you use a 12V lead-acid battery, you could wire the leds in strings of 2 or 3. Each string would require a current limiting resistor. You don't tell us the LED current, so I can't tell you what this should be. The formula for calculating it is:
For 2 LEDs in series R = 5 / i
For 3 LEDs in series R = 1.5 / i
where i is the LED current in amps.
Using 3 LEDs in series is more power efficient but the brightness will decline more noticeably as the battery drains.
I don't know why you think you need transistors.
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FL-220RL-WW-WT-LED WARM WHITE TWINKLE ROPE LIGHT
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