The current limiting resistor for Glowing led from ac: The LED (light emitting diode) operating voltage is very low. Working voltage is in between 1.5 to 3v DC. generally, we have seen that there are all indicators in our house on the wall switchboard Are of the neon bulb. which is small in size and connected with a 68k resistor in series.
This guide will help you to make an indicator that glows very nice and looking using LED. Let s’ make a LED indicator easily. LED indicators are long lasting than others. I am discussing the LED indicator circuit that can be used with 230 volt AC.
The LED light glows more bright and more looking beautiful than other bulbs. But there is a problem with LED is this work only with DC power not with ac. If you directly connect the led to the AC source without using resistors, it will burn or explode.
Circuit Diagram
What resistor to use with Led
To avoid this failure of the LED we are using a 68k ohms or 100K ohm resistor. That means the connecting resistor to the phase line to reduce the voltage suitable for LED. After the resistor, rectifier diode must be connected in series with the resistor to make the AC signal into DC and then it connects the LED positive terminal. The negative pin of the LED directly connects with ac ground.
If you want to make more light glowing of LED then a 50k ohms resistor connect at the place of 100K ohm resistor. use these current limiting resistors as per your need.
Please always do carefully this job and very carefully connect the resistor and the diode as per the diagram.
The Light emitting diode having its own current and voltage for proper working. so we select the resistors according to the voltage and ampere of the input voltage. If you have any doubts in connecting led with AC source, let me know through the comments.
FAQ
No, don’t connect your LED lights directly to the Ac supply voltage. The LED lights are working in very low DC voltage. Applying high voltage damages the LED quick as you connect.
The value of the resistor is depending on the LED forward voltage and its current. High value resistors are used to limit the ac current. Typically, using resistors of 100 K ohms to 330K Ohms with high wattage.
