The LED voltage V L is determined by the colour of the LED.

Simple LED (Light Emitting Diode) circuit diagram. Blue and white LEDs have the highest voltages. If the supply voltage V S = 9V, and you have a red LED (V L = 2V), requiring a current I = 20mA = 0.020A, R = (9V - 2V) / 0.02A = 350, so choose 390 (the nearest standard value which is greater). Red LEDs have the lowest voltage, yellow and green are a little higher. The Guru - Single led - Series leds - Parallel leds.:GURU. As a general rule I found that when using 5 volts and a red LED, a 330 ohm resistor normally will work in series with the red LED.

Superbright leds can go from 30mA up to several amps. In electronics, an LED circuit or LED driver is an electrical circuit used to power a light-emitting diode (LED). The circuit must provide sufficient current to light the LED at the required brightness, but must limit the current to prevent damaging the LED. I still like spelling things out: Rs= ( Supply Voltage minus LED forward Voltage drop ) / ( LED Current) Rs meaning a resistor in series. Supply Voltage VOLTS Voltage Drop Across LED VOLTS Desired LED Current MILLIAMPS How many leds connected Exact calculated resistance OHMS. Due to the non-linear nature of the diode characteristic curve, an LED operates within a very narrow range of forward voltage and forward current parameters. LED voltage. As led forward voltages: Red and green: 2 volts Blue and white: 3.0 - 3.5 volts Led current: 20mA will work for most regular leds.


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