Hello all - simple question.
Recently I purchased THIS 7 segment LED display.
The company stated that the forward voltage was 1.8V.
Connected to output pins of an Arduino at 4.8V, the segments were all nice and bright.
I didn't believe the manufacturer's 1.8V spec so I used my simplistic power supply and made this Voltage/Current curve.
I'm happy to report that the manufacturer's specs are correct!
1.8V at 10mA gives a nice bright LED.
Questions:
1 - Why would an LED be manufactured for such a low voltage when CMOS and TTL are 3.3 and 5V respectively?
2 - Can I treat these just like any LED, use 5V and a 1k resistor to limit the current to 10mA?
Again, I thank you in advance.
Recently I purchased THIS 7 segment LED display.
The company stated that the forward voltage was 1.8V.
Connected to output pins of an Arduino at 4.8V, the segments were all nice and bright.
I didn't believe the manufacturer's 1.8V spec so I used my simplistic power supply and made this Voltage/Current curve.
I'm happy to report that the manufacturer's specs are correct!
1.8V at 10mA gives a nice bright LED.
Questions:
1 - Why would an LED be manufactured for such a low voltage when CMOS and TTL are 3.3 and 5V respectively?
2 - Can I treat these just like any LED, use 5V and a 1k resistor to limit the current to 10mA?
Again, I thank you in advance.
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