Simple Circuit for White LED Night Light -  This simple circuit is designed to plug into a standard AC electrical outlet. It uses four super bright white light emitting diodes (LED) in conjunction with a capacitor coupled full wave rectifier circuit . . . [Circuit by David A. Johnson P.E.,  07/27/03]

Simple current limiting for LED flashlights -  . . . 

Simple LED Constant Current Lighting Circuit -  . . . 

Simple LED Constant Current Source -  Chip manufacturers are always coming up with ever more sophisticated constant current driver chips for LEDs. We have included this design for those of you who prefer a more cheap and cheerful solutionmust register on this site. . .  [Published in Elecktor July/Augu, 2010]

Simple LED flasher circuits -  By simple, I mean that these circuits only flash one or two LEDs. This is opposed to the light chaser circuits that can flash four or more. Of course, the simplest LED flasher is simply to use a flashing LED. The problem with that approach is you have no control over the flash rate, but it does have its use for eye catching displays for selling stuff. The circuits below give you that control, . . . 

Simple Logic Probe uses Bicolor LED -  03/13/98 EDN Ideas(File has several circuits, scroll to this one) A project posed the challenge of replacing existing analog potentiometers (used to set brightness and contrast levels]in video monitors with digitally controlled potentiometers. The differ. . .  [by Mark Shill, Burr-Brown Corp, Tucson, AZ]

Simple Negative Supply Circuit -  This simple circuit consists of two LEDs and a photo diode. It generates a negative voltage with a current level of a couple milliamps. It is ideal for supplying a negative rail to low power “rail to rail” op Amp circuits, which need to have a true zero volts output. Note:  This circuit is not particularly efficient . . . [Hobby Circuit designed by David Johnson P.E.,  07/13/06]

Simple Photodetector Circuit -  I´ve designed this simple circuit to test a photodetector. I got the detector from an old 5 1/4" disk drive. If you can get one, you will find two photodetectorts: one is used to sense the density (double density or high density) . . . 

Simple RF signal meter with LEDs -  The simple but effective circuit presented here converts an RF input signal into a visible LED indication. Only discrete components are used. The circuit can be used as field strength analyser or RF Wattmeter when a 50 ohms resistor is connected between ground and HF (J1). Calibration required. Of course you can add extra LED stages in case you want to extend the range. The second picture shows how the circuit can be build on a very small piece of vero-board. . . .  [Ron Zoetermeer, JO22gb, Netherlands]

Simple single-cell white-LED driver uses improvised transformer -  02/15/07  EDN Design Idea   Minimal component-count circuit boosts a single cell's voltage to light an LED. . .  [by Jim Grant, Scientific Controls, Orlando, FL]

Simple two transistor circuit lights LEDs -  04/09/09  EDN Design Idea   A previous Design Idea   describes a circuit that uses an astable multivibrator to drive an LED (Reference 1]. The circuit in Figure 1 uses a simpler alternative approach. The circuit uses a 2N3904 NPN transistor and a 2N3906 PNP trans. . .  [by Barry A Tigner, Michigan State University, East Lansing, MI]

Simple Voltmeter Monitors TTL Supplies -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs. LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors. LED designers have the option of not only controlling the power stage, but regulating LED currents as well, eliminating the need for multiple components and reducing system cost. . . .  [Texas Instruments App Notes, 2-Oct-02]

Simplest LED Flasher circuit -  This may be the simplest LED flasher circuit you can build, with the notable exclusion of LEDs with integrated flashing circuits. This might be a good replacement for the LM3909 in some applications.
. . .  [From Dick Cappels' project pages]

Simplest LED Flasher Circuit using a 2N2222 transistor Simplest LED Flasher Circuit led -  . . . 

Simplified PC Connections for Gpib Instruments -  Application Note. . .  [Aligent]

Simplified white-LED flasher operates from one cell -  05/26/05  EDN Design Idea   1. 5V circuit flashes white LED. . .  [by Anthony H Smith, Scitech, Biddenham, England]

Single & Two Cell White LED Drivers Without Inductors -  The operating voltage of white LEDs coupled with my emotional need for low cost for a given function, motivates me to make LED drivers suitable for battery operated lanterns that can run from a small number of cells. White and Ultraviolet LEDs. . .  [From Dick Cappels' project pages]

Single and Two Cell White LED Drivers Without Inductors -  . . .  [From Dick Cappels' project pages]

Single Cell Flashes White LED -  11-Dec-03 EDN Design Idea   Many portable appliances and other products that must operate from a single cell are restricted to working at very low voltages. It is thus difficult to drive white LEDs that typically have a forward voltage of 3 to 5V. The ability. . .  [by Anthony Smith, Scitech, Biddenham, Bedfordshire, UK]

Single cell LED flasher with two-year battery life (LM3909 replacement) -  . . . 

Single cell LED flashlight -  A driver circuit for high efficiency white LEDs that runs on a single rechargeable or alkaline cell. . . .  [Manfred Mornhinweg]

Single cell lights any LED -  07/05/01  EDN Design Idea   The circuit in Figure 1 allows you to light any type of LED from a single cell whose voltage ranges from 1 to 1. 5V. This range accommodates alkaline, carbon-zinc, NiCd, or NiMH single cells. The circuit's principal application is. . .  [by Al Dutcher, Al Labs, West Deptford, NJ]

Single Cell TPS61041 LED Driver -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs. LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors. LED designers have the option of not only controlling the power stage, but regulating LED currents as well, eliminating the need for multiple components and reducing system cost. . . .  [Texas Instruments App Notes, 9-Jun-03]

Single Cell TPS61041 LED Driver Slva136.Htm, 1 Kb -  TI Application Note . . . 

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