.. CMOS CD4017 Johnson counter The circuit is divided into two portions for easy understanding: Logic control (Figure 1) and LED driver (Figure 2). Figure 1. LED controller. The circuit is controlled by a momentary push switch. Until SW1 is ...
.. 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 using an adjustable current source (Fig. 1). ...
.. 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 constant-current output using the circuit in Reference 1 , you configure the regulator IC as ...
.. 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 ...
.. Bruno Electronic Design 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 ...
.. 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 non-inverting input). The ...
.. information In this article we will talk about a simple device that I designed for automatic control of additional LED lighting in the kitchen. Kitchen renovating and complete replacement of kitchen cabinetry are main reasons for ...
.. Grant, Linear Technology Design Note 556 Introduction The LT®3952 monolithic LED driver includes a 4 A, 60 V DMOS power switch, excellent for driving high current LEDs in buck mode. Among its many ...
.. helped to minimize the size and power consumption (Figure 1). Figure 1. This circuit provides fast light pulses in a blue LED. The normally high pulses at the output gate, G4, in IC 2 have rise and fall times of approximately 2.5 nsec and a ...