Circuits & Schematics Light: led

1. High-power LED drivers require no external switches
   Circuits Supply Light Maxim MAX1685 MAX4162 MAX5035
   .. delivering constant, high-intensity light over as extended a range as possible. Figure 1. This miniature, 1 A, high-power LED driver operates on 3.6 to 6.5 V. Figure 2. Similar to the circuit in Figure 1, this miniature, 1 A, LED driver ...
   20-03-2024

2. Simple night-light uses a photoresistor to detect dusk
   Circuits Automation Beginners Light Analog Devices AD8214
   .. falls dramatically as you illuminate it. You can use an LDR in a circuit that detects darkness and turns on an LED (Figure 2). The circuit uses a high-voltage threshold-detector IC that features a current output and operates as a ...
   24-10-2023

3. Single cell flashes white LED
   Circuits Supply Light
   .. It is thus difficult to drive white LEDs that typically have a forward voltage of 3 to 5 V. The ability to flash the LED with a supply voltage as low as 1 V presents additional complications. The circuit in the Figure 1 provides a ...
   26-09-2023
4. Light a white LED from half a cell
   Circuits Supply Light Texas Instruments SN74AUC1G14
   .. Q 1 turns on, and current begins to ramp up in inductor L 1 . Figure 1. This circuit produces dazzling intensity in a white LED from very low battery voltages (a). A modification allows even lower battery voltages (b). The maximum, or peak, ...
   20-07-2023
5. LED driver delivers constant luminosity
   Circuits Supply Light
   .. action in inductor L. The voltage across the inductor reverses, and the energy stored in the inductor transfers to the LED in the form of a down-ramping pulse of current. During flyback time, voltage across the LED is approximately ...
   19-07-2023
6. LED-current limiter accepts ac or dc
   Circuits Supply Light Microchip MIC5209
   LED drivers have lots of features and require plenty of external components. When your application requires no PWM ...
   18-07-2023
7. Accurately simulate an LED
   Circuits Measurement Light Citizen CL-L251A-MC6L1
   .. driver circuit using LEDs, although easy, yields only typical results because the tests don’t factor in worst-case LED parameters and often generate undesirable light and heat during driver debugging. Although using a constant ...
   20-03-2023
8. Finely tune the hue of blue-light sources
   Circuits Light Analog Devices AD5228 AD590JR AD8602ARM-REEL
   .. uses a narrower range from cyan to royal blue. The light is a mixture from two power LEDs, both from Avago Technologies. LED 1 , the ASMT-JC11, is a recently introduced, high-performance, thermally ruggedized, miniature, 1 W cyan unit, and ...
   14-03-2023
9. Self-oscillating H bridge lights white LED from one cell
   Circuits Oscillators Supply Light Fairchild BC550 BC557
   .. pump to generate negative supply voltage in battery-powered systems. This Design Idea shows how to use it to light a white LED from one cell without an inductor. РFigure 1. Resistors R 1 and R 2 and capacitors C 1 and C 2 set the oscillation ...
   15-02-2023
10. Using LEDs as an RGB sensor
    Circuits Measurement Light Texas Instruments LM358 OPT101 TL431A
    .. super bright 3 mm colored LEDs purchased from AliExpress (Figure 1). Figure 1. Spectrum response of the RGB sensor. A red LED is used for the R-sensor, a yellow LED for the G-sensor, and yellow-green for the B-sensor. The RGB sensor is made ...
    19-01-2023

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