Tag: LED Circuit

This temporary lamp circuit is very helpful in emergency situation or in any application where we don’t have much time to turn off the lamp. Just press the push button, do a little fast task, and then leave it. This circuit hold the LED light for about 10 seconds, which should be enough for most simple tasks.  Here is the […]

Usually, LED is powered by DC supply, but this circuit can make the LED can be powered by AC supply. This circuit can be used as power indicator for Water pump. There are two circuit  versions of AC-powered LED presented here. First is circuit for US or Canadian 110-120V 60Hz AC lines and European or Australian 220-230V 50Hz AC lines. […]

To add PWM intensity control to connected LEDs, a switched-LED power supply approach can also be used. A circuit using a PWM-based supply to provide additional intensity control to some LEDs is shown on figure below. The PWM waveform and I²C commands to the LED driver is sent from the same microcontroller. A software routine can control the PWM waveform. […]

In conventional white LED design, the Max1916 low-dropout bias supply for white LEDs is a high performance alternative to the simple ballast resistors. A single resistor is used by this device to set the bias current for three LEDs, which are matched to 0.3%. On enable condition, the MAX1916 consumes only 40uA of supply current and 0.05uA when disabled. The […]