Connecting LEDs directly to AC mains

172

02:06:14

Easy circuit for connecting LEDs directly to AC mains without a DC power supply. The RMS current through the circuit can be approximated by Vrms/sqrt(R²+1/(2pi*f*C)²), since diode forward voltage is small compared to AC mains voltage. For a single LED, connect a normal diode in anti-parallel config (diode cathode goes with LED anode and vice-versa), in order to avoid DC currents in power lines, which can be detrimental to them.

published 3 years ago

nordistu

3 years ago

It's OK :).... Just modify LED's value for 2V and 20mA, and capacitor value at 470nF.... You'll see light :)

CristianDL

3 years ago

Well, this was actually a circuit for AC mains detection using a H11AA1, which is an AC input optoisolator. This is the input part of the circuit, and the datasheet indicates forward voltage of 1.2V and typical forward current of 10mA, so... joke's on you :P

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