Hi, please forgive my ignorance, my knowledge is limited for this stuff.
I have made the circuit attached here. It consists of 3 parallel LEDs each with a resistor in series. The resistors are 330ohm and the specs on the LEDs are If mA: 20 (max.), Vf: 3.7 (volts typ.), Vf: 4.5 (volts max.)
The circuit is powered by a variable DC supply.
I'm not sure how to figure in the impedance of the LEDs into my calculations. I have estimated the impedance based on the above data, but I don't think I have it right. Somewhere between 185-550 ohms?
I have calculated that I can safely use this circuit up to about 9VDC. I am currently running it on 4.5VDC and it works fine.
Can anyone verify this for me?
Thanks,
lsmall
I have made the circuit attached here. It consists of 3 parallel LEDs each with a resistor in series. The resistors are 330ohm and the specs on the LEDs are If mA: 20 (max.), Vf: 3.7 (volts typ.), Vf: 4.5 (volts max.)
The circuit is powered by a variable DC supply.
I'm not sure how to figure in the impedance of the LEDs into my calculations. I have estimated the impedance based on the above data, but I don't think I have it right. Somewhere between 185-550 ohms?
I have calculated that I can safely use this circuit up to about 9VDC. I am currently running it on 4.5VDC and it works fine.
Can anyone verify this for me?
Thanks,
lsmall