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Super Bright White 5mm LED 17000 mcd 10 Piece Kit with Voltage Dropping Resistors
If I'm putting up to 27 of these on 1 circuit, how many amps total would they draw, and could I use just 1 voltage dropping resistor, or does each LED needs its own resistor?
For use with the recommended 5 VDC or 12 VDC source voltage each LED needs its own resistor. Don't be tempted to use a single resistor for multiple LEDs in parallel.The purpose of the resistors is not really "dropping the voltage" like PE says, the purpose is setting the LED current, i.e. making the supply voltage source into a constant current source as required by the LED.Using a 5VDC supply and the 100 ohm resistors included with the kit the current per device will be (5.0V - Vforward)/100 ohms = (5.0V - 3.0V)/100 ohms = 20mA. Using a 12V supply and the included 470 ohm resistors the current per device will be (12.0V - 3.0V) / 470 ohms = 19mA.
Date published: 2015-05-11
For Super Brite White LEDs (5mm 17000 mcd), dropping resistors are supplied for 5VDC and 12VDC. What dropping resistor is required for 6VDC input?
I would recommend a 60 ohm, 1/2 watt resistor for an input voltage of 6 VDC.
Date published: 2014-11-26
How many leds do I need to replace a 75W bulp and what would be a good 12V transformer for them?
You can use as few or as many as you want as long as you use the appropriate resistor to drop the voltage.
Date published: 2012-11-21