Some LED circuits explained examples from various projects: flashing LEDs, 220V LEDs and more.We start by showing you the LED circuit in series with a resistor. You must make some calculations to figure out the resistor value, depending on voltage power supply, LED voltage drop and desired current.

**Series LED circuit**

(Source Voltage – LED Voltage Drop) / Amps = OHMs

Amps = mA/1000

Example:

Source Voltage = 9 volts

Voltage Drop = 3.1 volts typical for a blue or white LED

Desired Current = 13 milliamps

So the resistor we need is: (9 – 3.1) / ( 13 / 1000 ) = 452 ohms so we will use a 470 Ω resistor.

##### 220 volt LED circuit

Caution: Do not try this circuit unless you have good knowledge about electronic devices. This circuit is connected to main power source (220V) and can give you a high electrical shock

We use one capacitor, a zener diode, a resistor and the LED.

The capacitors value depend on LED current. With a 100 nF capacitor, the LED current is 4 mA; at 470 nF the current is 20 mA.

Read more: http://electroschematics.com/2573/led-circuit/#ixzz1DxLLR9XE

Nice one! Its help me to design my own custom led circuit board. Thanks for share this pcb design and layout.

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