Circuits & Schematics Light: led - 5

41. 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

42. 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

43. 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
44. 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
45. 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
46. 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
47. 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
48. 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
49. 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
50. Controller for automatic lighting of the working area in the kitchen. NodeMCU Version - OTA update
    Circuits Automation Wireless Light Arduino ESP8266 PCA9685 DS18B20
    .. is unstable at the time of access to the DS18B20 temperature sensor, which is manifested by a brief and faintly blinking LED strip. Therefore, I think that it will be necessary to refrain from using software PWM in the ESP8266 in favor of ...
    23-01-2018

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