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LED at 230 V

Small schema to run a LED on line voltage (English)

This little schema allows to connect a LED to line voltage. A LED can not handle with 230V AC and needs a current which is limted to ca. 15mA. The first issue is simply solved with a diode which eliminates the voltage in reverse-biasing. The current is limited by the combination of the resistor and capacitor. Used at AC capacitors work as frequency dependent resistors. You can simply calculate the capacitive resistance of the capacitor by the following formula:
Formula
Based on a frequency of 50Hz and a capacity of 220nF you get a reactance of ca. 16kΩ. This is just perfect for a LED. The resistor prevents that the capacitor does not charge that abruptly.

Hinweis

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

Part list

  • 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

Circuit diagram

Circuit



Source by : Benedikt Wirmer

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