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How to connect 100,3mm White LED 6000 mcd, to 110 Volts?
I need to connect arround 100, 3 mm white LEDs in series to 110V ( household electricity). Can just connect them all in series and hook them up to the power source or do i have to add resistors? is there any website that could give me the circuit diagrams?
I will appreciate everyones help
You can connect a number of them with a series resistor and a bridge rectifier to the 120 volt line.
The number you can connect, and the value of the resistor depend on the specifications on the LEDs. You do have specs?
Usually you have a typical Vf, a max Vf, and a nominal If. With a lot in series we can probably work with the typical. Assume this is 3 volts, and If is 50 mA. You can recalculate for different numbers.
Now we need to pick a voltage across the resistor, this serves to limit the current, as Vf changes a lot with temperature, and without a limiting resistor, you can burn out all of the LEDs. I'll pick 20 volts as the drop on the resistor. That leaves 100 volts for the diodes, and at 3 volts each, you can only put 33 in series. So you need 3 strings of 33 each, each string with it's own resistor. But they can share the same rectifier.
Resistor would be: 20v/50ma = 400 ohms
Power dissipation is 20v*50ma = 1 watt, use a 2 watt resistor. You can use 8 – 50 ohm 1/4 watt resistors in series.
Bridge, use 4 1N4004 rectifiers in a bridge configuration.
Add a 1/2 amp fuse. But while you are experimenting, I'd add a 100mA fuse to each string.
PS, you do know that 120 VAC or DC can be lethal, and cause fires?
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