Arduino RGB LED Color Wand
by T.K. Hareendran in Arduino | Tested |
Here is an artistic Arduino project for the fun-minded. The circuit is an Arduino RGB LED controller running on a sweet ‘n’ simple code,but with a little hardware surprise outside the Arduino board. You can add a bit of luxury to your aquarium or flower vase using this digital color wand! Here, D11-D10-D9 pins of...
LED Constant Current
by P. Marian in Lights | Tested |
This is a very simple led constant current design using only 2 transistors, 2 resistors and an LED. This circuit allows you to use any voltage between 2V and 24V to drive almost any type of LED with power consumption up to 5W. The T2 transistor can be BC547 if you use only usual leds (the 20mA versions) but it is recommended...
LED at 220V Circuit
by P. Marian in Lights |
LED has become more and more popular for use as light indicator because of its low cost and long life. Unfortunately the LED works only at low voltages and even then you need to use a resistor in series. It is not a good idea to limit the current at higher voltages using a resistor because the dissipated power will be too high...
Portable LED Lantern
by T.K. Hareendran in Lights | Tested |
This circuit is a simple emergency light with 20 “white straw hat” LEDs. One advantage of this little circuit is that we can use any ordinary 5VDC mobile phone charger ( or a 5V solar panel) to recharge the internal storage battery. Typical specification of a generic “White Straw Hat” LED (these LEDs are widely used in chinese...
ADP1649 1A LED Flash Driver
by P. Marian in Datasheets | Lights |
The ADP1649 is a very compact, highly efficient, single white LED flash driver for high resolution camera phones that improves picture and video quality in low light environments. The LED driver maximizes efficiency over the entire battery voltage range to maximize the input power-to-LED power conversion and to minimize...
LED Solar Lantern Lights
by T.K. Hareendran in Lights | Solar | Tested |
Circuit of the LED solar lantern lights presented here is built around one 6V/1W Solar Panel (PhotoVoltaic Panel) and a 4V/800mAh Lead-Acid Battery. Here, commonly available 5mm White Straw Hat LEDs are used as the light source. how does the solar lantern circuit works DC 6V supply from the solar panel is fed to the...