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16 Ιαν 2011 · The circuit below illustrates powering a LED (or two) from the 120 volt AC line using a capacitor to drop the voltage and a small resistor to limit the inrush current.
The following circuit diagram shows you about how to powering a LED (or two) from the 120 volt AC line applying | working with a capacitor to drop the voltage together with a little resistor to limit the inrush electric current.
16 Μαρ 2007 · For 10 mA and 120 volts (rms), the resistor value would be 120 / .01 or 12000 ohms. R = V / I. The impedance of a capacitor C is 1/j (2*pi*C*f) where the frequency "F" is in hertz. The "j" is electrical engineering for the square root of negative 1.
The circuit below illustrates powering a LED (or two) from the 120 volt AC line using a capacitor to drop the voltage and a small resistor to limit the inrush current.
There are two circuit versions of AC-powered LED presented here. First is circuit for US or Canadian 110-120V 60Hz AC lines and European or Australian 220-230V 50Hz AC lines. Here is the circuit:
AC Line Powered LED Pilot Light. This simple circuit can be used to light a LED indicator lamp, powered from the 120vac line. I have included component values for 240vac lines as well.
In Using AC with LEDs, part 1 and part 2, we looked at ways to adapt AC power to LEDs without the usual conversion to pure DC first. Here, in part 3, we combine what we learned before to design a LED light that operated directly off AC mains.
