R2-D2
Member
I used a 12v DC wall adapter to power 3 LEDs as a light source for my project.
I measured the output of this adapter power supply plugged into the wall and its output was measured at 17.4v DC! I believe it's because there's much more than 120v AC coming out of the wall socket for it have that high of a DC output - or maybe it's just very cheap. (Wall adapter input is rated at 120v AC.) I plan to use a regulated 12v DC supply instead.
Well, I powered three of these LEDs with this juiced up wall adapter and may have overdriven them in the circuit. (A 100Ω resistor is connected in series.) LEDs are rated at 3.0 - 3.2 volts at 24mA max (75mA peak) With the 17.4 volts from this wall adapter that powered these LEDs, I measured about a 3.35 voltage drop across each one at about 56mA - beyond their rated specs. My question is, could I have done some damage to them or drastically shorten their lifespan? So far they work fine but was just curious to know.
I measured the output of this adapter power supply plugged into the wall and its output was measured at 17.4v DC! I believe it's because there's much more than 120v AC coming out of the wall socket for it have that high of a DC output - or maybe it's just very cheap. (Wall adapter input is rated at 120v AC.) I plan to use a regulated 12v DC supply instead.
Well, I powered three of these LEDs with this juiced up wall adapter and may have overdriven them in the circuit. (A 100Ω resistor is connected in series.) LEDs are rated at 3.0 - 3.2 volts at 24mA max (75mA peak) With the 17.4 volts from this wall adapter that powered these LEDs, I measured about a 3.35 voltage drop across each one at about 56mA - beyond their rated specs. My question is, could I have done some damage to them or drastically shorten their lifespan? So far they work fine but was just curious to know.