Circuits & Schematics - Light: led - 4

31. Adjust power-efficient LED switch to any light intensity
    Raju Baddi
    Circuits Automation Light
    .. can use an LED as a photoelectric sensor. A previous Design Idea shows that such a switch is highly power-efficient, consuming ...
    Jul 23, 2013

32. Low-duty-cycle LED flasher keeps power draw at 4 mW
    Marián Štofka
    Circuits Light Power
    .. here should prove useful. Figure 1. Q 1 and Q 2 function as a current source and push a constant current through the LED regardless of its forward voltage drop (within the compliant voltage limitations). The Schmitt inverter forms a ...
    Aug 21, 2013

33. Compact 90-135 Vac Hi-PF Boost LED Driver
    Circuits Supply Light Application Notes ON Semiconductor NCP1075 NCP4328A
    .. Note DN05055/D October 2013 High voltage LEDs are becoming more popular and are now available from multiple LED manufacturers such as CREE and Philips-Lumileds. These package LEDs may have typical forward voltages ranging from ...
    Nov 17, 2013
34. One-chip 11×10 LED matrix
    Circuits Microcontrollers Usage Light PIC16F688
    .. project is pretty cool for a few reasons, and driving a huge LED matrix with a single 8-bit controller is just one of them. The idea was born when I bought 120 LEDs of the wrong ...
    May 29, 2014
35. 60 V, Synchronous Step-Down High Current LED Driver
    Circuits Supply Light Power Linear Technology LT3743 LT3763
    .. (Walker) Bai, Linear Technology Design Note 508 Introduction The meaning of the term high power LED is rapidly evolving. Although a 350 mA LED could easily earn the stamp of high power a few years ago, it could not ...
    Dec 18, 2014
36. Enhanced PWM LED Dimming Circuit
    Circuits Supply Light Application Notes ON Semiconductor NCL30051 NCS1002 NCL30051LEDGEVB
    .. Note DN05034/D November 2013 The NCL30051LEDGEVB LED driver evaluation board provides PWM dimming capability via gating the resonant half bridge converter on and off at ...
    Nov 30, 2013
37. Current Source For LED Microscope Illuminator Provides Full-Spectrum Light
    Circuits Supply Light
    .. circuit uses a 6-V DC supply with a PWM current-source configuration to provide efficient, adjustable dimming of a white LED over a wide range, needed to accommodate the unique lighting needs of an optical microscope over its magnification ...
    Jan 2, 2015
38. An improved offline driver lights an LED string
    Circuits Light Power
    .. of LEDs with a constant current over the entire worldwide range of AC-mains voltages. The resistor in series with the LED string provides a convenient point to measure LED current via its voltage drop. The concept presented here ...
    Mar 1, 2015
39. High Power RGB LED Color Mixing
    Circuits Light Power CAT4101
    .. and powered from a 5 volt DC supply. Figure 1. Constant current drive circuit. With a 500 millivolt minimum above VF of the LED die, this circuit allows control over the individual RGB die currents with a range from around 100 mA up to 1 amp. ...
    Mar 18, 2015
40. The perfect Remote, Programmable, Controller for interactive LED strips. Part 1 - Specification and Schematic
    Circuits Wireless Microcontrollers Usage Light
    .. Landoni, open-electronics.org Since when white light emitting high brightness LED are available, the handover from traditional lighting bulbs to the solid-state lighting has become irreversible: ...
    Sep 29, 2015

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