.. 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 ...
.. 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 ...
.. 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 ...
.. 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, ...
.. 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 ...
.. 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 ...
.. 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 ...
.. 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 ...
.. 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 ...