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Simple LED Circuit

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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.

220v led

Some LED flasher circuits…

LED technology
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6 Responses to “Simple LED Circuit”

  1. Abdul Jabbar says: on February 20, 2010 at 7:15 pm

    I need mobile phone battery charger circuit with battery over charge protection
  2. johnny says: on February 19, 2011 at 3:19 pm

    Hey Guys
    What brings me to your forum is a problem I’m half Mohegan Indian here in Ct . We are having problems with 2 stray dogs constantly on our propery and a stray wolf and bad neighbor with dog that are always on our property my daughter is in danger. I do not wish to put up a fence also no effective police nor health dept.. I wish to aquire or have build a powerful outdoor ultrisonic system , Ive built and fabricated mickey mouse internet sonic systems with no effect. IF this is something someone could build for us. I’am willing to pay upfront for parts and labor and after testing success another dozen units. I can also offer a free stay@ Mohegan sun resort and any free concerts for anyone who is knowledgable to build such a unit.. My family thanks you for anyhelp that you might provide..

    thanks
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    off2timbuktu@yahoo.com
  3. usman says: on March 8, 2011 at 10:12 am

    wat is the size of led used in that circuit of 9 v
  4. arun sharma says: on March 8, 2011 at 10:19 pm

    so good
  5. NIRAJ PAREKH says: on May 5, 2011 at 11:52 pm

    SOLAR SISTEM IN USE AND HOME LED LIGHT YOUR GIDE
  6. KDS says: on September 9, 2011 at 11:33 am

    what does the zener diode do?

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