Posts Tagged ‘LED Circuit’
LM10 Battery Voltage Threshold Indicator
A battery threshold indicator circuit shown in the schematic diagram below has current regulation mechanism in driving the LED. A sufficient current should be satisfied at the minimum voltage but no excessive current when the voltage is at the highest level. Balance pin (5) is used as the reference voltage for regulating the current. This …[Read More]
Ring-Around LED Flasher
This schematic diagram shows a ring-around LED flasher circuit. This circuit will turn off two LEDs and turn on the other two until the timing cycle reverses. This circuit can be configured to flash four LEDs in sequential order by pressing and holding S1 closed until only one of the LEDs is on then releasing …[Read More]
This circuit gives a changing-color LED display, where a LED will emit a dynamic shifting color, from red to green smoothly through yellow. The circuit uses NE556 dual timer, equal to two 555 IC but in only one package. The oscillators is set at different frequencies. The high frequency (upper part) is used to construct …[Read More]
PWM RGB Controller
The design of a Pulse Width Modulated Red-Green-Blue controller will be explained here. This design is efficient because this design uses multiple strings of six LEDs with a 24V DC source. This design is sufficient for a sizeable light because a total current of 2 Amps will supply 600 LEDs per color. The circuit below …[Read More]
Two Transistors Single Cell Battery LED Driver
To operate, LED needs more than 1.5V voltage level. If you want to operate a LED with a single cell battery, you must boost the voltage to enable powering the LED. Here you can use two transistor circuit for boosting the battery’s voltage: The transistor shown in the schematic diagram is 2N3904 and 2N3906, but …[Read More]
LM3404 Constant Ripple LED Driver
To take an input voltage of 24VDC ±10% and drive 1A through as many LEDs in series as the maximum output will allow, the circuit shown in the schematic diagram below uses the ONO-based constant ripple concept. The average current controls the luminous flux and dominant wavelength (or color temperature for …
Efficient LED Driver Works with Single AA Cell
This driver circuit is not only boost the voltage to enable a single battery cell to power two red LEDs or one white LED, but also regulate the current so the light will be constant until the battery runs out its power. The main component of this single cell LED driver is transistors and ferrite …[Read More]
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