Circuits & Schematics Light - 7

T A Babu EDN The key features of this Design Idea are: Soft switch on/off operation Zero current drain in sleep mode Two level dimming Low battery protection Simple controller based on CMOS CD4017 Johnson counter The circuit is divided into two ...

Howard Myers EDN Since the LED's invention more than 40 years ago, its emission efficiency has steadily increased, and, although it may surprise you, the increased conversion efficiency works in two directions. Certain bright, efficient LEDs, ...

By using two basic power-supply topologies in conjunction, this circuit provides an easily controlled current source that is well-suited for dimming LEDs Many applications for LED illumination require wide dimming ratios, which can be easily done ...

Part 1 - Arduino Version. Schematic, Sketch and PCB General information Schematic diagram Printed Circuit Board (PCB) Arduino Sketch Highlights Conclusion Downloads References General information The second version of the controller is made on a ...

José M Blanes and Ausiàs Garrigós EDN Electronics engineers often use photovoltaic-module simulators to test dc/dc-power converters, inverters, or MPPT (maximum-power-point-tracking)-control techniques. The use of these ...

Massimo Gottardi EDN The Design Idea in Figure 1 is a color detector capable of generating an RGB triplet over a high dynamic range, a useful attribute for machine vision applications. The circuit implements auto-exposure control to achieve this. ...

Many suitable circuits exist for driving LEDs in constant-current mode and from low-voltage sources. For example, references 1 , and 2 show circuits that use switched-mode-regulator ICs and low-voltage sources to supply LED current. To produce a ...

Loren Passmore EDN As in a previous Design Idea (Reference 1), this design uses an LED as a transducer to measure the ambient-light level and to provide illumination. This Design Idea uses the same principle as its predecessor but consists of only ...

This basic low-power driver, based on a few standard discrete components, can supply a variety of LED types and loads. Figure 1. With a few standard discrete components, this LED driver can source current to a series string of LEDs. It allows for ...

The Design Idea in Figure 1 is a precision current mirror used to drive two strings of five white LEDs. Figure 1. Current source/mirror driving two LED strings. The op-amp has double negative feedback (since M2 inverts the signal at the ...