LED an 230V

LED at 230V on AC mains

This little circuit allows to connect a LED to line voltage. Two issues have to be solved for that: LEDs cannot cope with such a high AC voltage, and the current has to be limited to ca. 15mA.  The first issue is simply solved with a diode that eliminates the voltage in reverse-biasing. To limit the current of the LED a capacitive resistor is used.

Attention. This circuit works with life threatening line voltage. All parts of this circuit are connected to the grid! Make sure that it is not possible to touch any parts of the circuit at any time and unplug the circuit everytime you want to check it.

In AC, capacitors work as frequency dependent resistors. With the formula shown below you can calculate the resistance inserting frequency (f) and capacity of the capacitor (C). Based on a frequency of 50Hz and a capacity of 220nF you arrive at a resistance (reactance) of 16kΩ which is just about right for one LED. For the US grid (110V, 60Hz) the values have to be adjusted accordingly.

Formel, um den Widerstand eines Kondensators zu berechnen
Formula to calculate the resistance of a capacitor operated in AC (f=frequency, C=capacity, R = resistance)

It is also possible to adjust this circuit to connect several LEDs in parallel. This increases the required current, hence the capacitor has to be adjusted with the help of the formula.

Required parts

  • C1: foil capacitor 220nF, 250V~ (stick to the values!)
  • R1: 2,2kΩ
  • R2: 220Ω
  • D1: 1N4007 (or comparable; must be suitable for 220V/230V)
  • LED1: standard LED

led230v_s

You will notice the additional R2 in the circuit diagram. It prevents that the capacitor charges too quickly when empty which would cause a short circuit.

27 Kommentare zu “LED at 230V on AC mains

  1. This idea is wrong.
    The power supply is given to ckt diagram the R=2.2k is blast and led is operate but idea me the ressistor is 56 k the operate yes or no

  2. sir i whant to need to operate 20watts led 220v ac 20watts led voltage is 9 vdc 1- iused 12vtransformer with bridge rect but led to hot it will worked fine but i whant to need profacnel cct diagram plz email me thank reg mahmood

  3. Circuit diagram
    what if I’m going to use 63 pcs of LEDs in parallel at where LED1 is placed, should I use the same materials as R1,R2,C1 and D1 with the 230V power supply? Please help…

  4. Circuit diagram
    what if I’m going to use 180 pcs of LEDs in parallel at where LED1 is placed, should I use the same materials as R1,R2,C1 and D1 with the 230V power supply? Please help…

  5. what if I’m going to use 200 pcs of LEDs in series or parallel at where LED1 is placed, should I use the same materials as R1,R2,C1 and D1 with the 230V power supply? Please help…

  6. can we use resistor place of capacitor because i saw in led lamp circuit in that they using 6 2.2k resistor for blowing 30 led at 230 v ac 50 hz

  7. I need to connect a led in series with the resistor. where the supply for that is an AC 230v. Which i’m using for this as an indication.

  8. Dear sir

    I need circuit which can operate 150 white (3v ) LED bulbs that should work on 230V

    thanks im daminda from sri lanka

  9. Dear Sir,
    Thank you for publish this circuit. what will happned,when we replace this LED to a 5colour LED, an add smoothing capcitor for it.
    thank you.

Hinterlasse eine Antwort

Deine E-Mail-Adresse wird nicht veröffentlicht. Erforderliche Felder sind markiert *

Du kannst folgende HTML-Tags benutzen: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code class="" title="" data-url=""> <del datetime=""> <em> <i> <q cite=""> <strike> <strong> <pre class="" title="" data-url=""> <span class="" title="" data-url="">