Circuits & Schematics Light: led - 5

41. LED current regulator has low dropout
    Circuits Analogue Design Light ON Semiconductor BC327 BC549C
    .. voltage. Its main advantage is a very small dropout voltage, which can be less than 100 mV. The design could find use on LED strips, where the voltage can vary along the length due to resistive drop, and small voltage changes result in ...
    20-11-2018

42. Ultracapacitor powers bicycle light
    Circuits Analogue Design Light Texas Instruments LMC555
    .. on-time of 43 msec (1.1×R 2 ×C 3 ). IC 1 drives transistor Q 1 to pulse the grounded taillight. You must use an LED for the taillight, because it does not draw the extreme surge current of an incandescent lamp and thus provides ...
    07-11-2018

43. Transistors drive LEDs to light the path
    Circuits Supply Light Cree C535A-WJN
    .. resistors act as a simple current source. Q 1 ’s base-emitter voltage, V BE , combines with resistor R 2 to set the LED current at approximately 20 mA. In this application, even a tolerance of 10% doesn’t significantly affect LED ...
    20-06-2018
44. Power an LED driver using off-the-shelf components
    Circuits Supply Light Texas Instruments NE555
    .. accurate current requires dedicated switching regulators. Choosing a discrete driver circuit requires an understanding of LED lighting to make the best trade-off. This Design Idea describes a simpler and equally good way to employ the ...
    07-06-2018
45. Single-port pin drives dual LED
    Circuits Microcontrollers Usage Light Siemens BSS101
    .. reasonably large amounts of current. This Design Idea shows three alternative methods for driving a two-pin, two-color LED from a single I/O pin. Figure 1 illustrates one possible approach that uses external inverter IC 1 to drive D 1 , a ...
    23-05-2018
46. Simple Threshold Switch For An LED Indicator
    Circuits Analogue Design Light Texas Instruments TL431
    .. H. Russell Electronic Design I needed a simple LED indicator showing that a particular voltage level had been reached specifically, that a capacitor had charged to a ...
    17-04-2018
47. Simple Ambient Light Sensor Controls White LED Driver
    Circuits Automation Analogue Design Light Texas Instruments OPA336N
    .. Sundararaj Electronic Design This idea describes a white-LED (WLED) driver circuit controlled by a simple ambient light sensor (ALS). A typical application would be a ...
    11-03-2018
48. Linear potentiometer provides nonlinear light-intensity control
    Circuits Analogue Design Light Analog Devices AD589 AD8031
    .. too dark because a fixed barrier shielded safe light. Using spare parts from a junk box, you could assemble a simple red LED-based auxiliary safe light, but if the light level were adjustable, you could balance the light levels and minimize ...
    27-02-2018
49. Single cell lights any LED
    Circuits Analogue Design Light
    .. Dutcher EDN The circuit in Figure 1 allows you to light any type of LED from a single cell whose voltage ranges from 1 to 1.5 V. This range accommodates alkaline, carbon-zinc, NiCd, or ...
    29-01-2018
50. Simple single-cell white-LED driver uses improvised transformer
    Circuits Supply Light
    .. Grant EDN A white LED delivers a wide color spectrum and better visibility than do monochromatic LEDs. However, a white LED presents a ...
    23-01-2018

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