Sequential Brake/Turn Lights -  Bar-mode LED-cluster sequencer; Can drive up to 16 clusters. . .  [Flavio Dellepiane's web site]

Sequential Flasher -  Great for Christmas lights, etc. Here is a simple circuit for sequentially flashing Christmas light strings or other similar low-power lamps. The socket symbols may be single bulbs or sockets for lamp strings. The load must be capable of operating from DC since. . . 

Sequential LED Flasher -  for 10 LEDs. . . .  [Tony van Roon's circuit]

Silent Metronome -  File contains several designs, please scroll to find this circuit. The circuit below is a "silent" metronome that keeps the beat without becoming a member of the band. The circuit flashes the 6 volt lamp at a rate set by the 20k potentiometer which can have a dial for setting the desired tempo. Alternately, the potentiometer could be replaced with a rotary switch and selected resistors. The lamp is an ordinary #47 bulb which will give good omni directional brightness but an LED and resistor could be used instead - try a 100 ohm in series with a   high-intensity LED. The batteries could be three C or D cells for good life. This circuit could be used to generate "clicks" in a speaker but such metronomes are not particularly pleasing. The ambitious might replace the lamp with a solenoid which taps on the wall of a hardwood box or wooden chime for a "professional" sound. . . .  [Charles Wenzel (unless otherwise noted)]

Simple circuitry for cellular-telephone/camera-flash illumination -  05/27/04  EDN Design Idea   Successfully implementing flash lamps involves understanding numerous practical considerations. Next-generation cellular telephones will include high-quality photographic capabilities. To support their improved image sensors and optics, they will need high-quality "flash" illumination, which requires special design attention. This lighting is crucial for yielding good photographic performance and requires careful consideration. . .  [by Jim Williams, EDN's most revered contributor-At 63 years of age, Williams passed away in June 2011 after a stroke.]

Simple Colour Organ -  This is a simple, one lamp colour organ. It is far less complicated then the Three Channel Colour Organ. It is simply a lamp controlled by an SCR. It can be built in a few minutes, and combined with other circuits to make some pretty neat effects. . . .  [Circuit designed by Aaron Cake]

Simple DIY laser light show -  Taping a mirror to your sub-woofer and pointing a laser at it is fairly ingenious. At least I never considered it, and I am nuts about lasers. . . 

Simple Flasher Operates Off AC Mains -  06/23/11 EDN Design Idea   A few components create an illuminated switch. Looking for a mains switch in the dark is easier if the switch contains a built-in neon or filament miniature lamp. Adding a small indicator to any mains switch is helpful. It is even better if the indicator flashes. This circuit makes a simple flasher using only four discrete components (Figure 1). . .  [by Noureddine Benabadji, University of Sciences and Technology, Oran, Algeria]

Simple Flashing Light Circuit 1 -  This project uses a 3909 IC and a few other parts; power is 1.5volts DC. . . .  [Designed by ML Rollins]

Simple Flashing Light Circuit 2 -  This project uses parts from Digi-Key. . .  [Designed by ML Rollins]

Simple Flashing Light Circuit 3B -  The simplest flashing light circuit in the world! This is the simplest flashing circuit, suitable for tops of tall buildings, smokestacks and water towers. . .  [Designed by ML Rollins]

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 light flashing -  This circuit use 2 transistor and some components. . . .  [Name of Designer is not included]

Simple Night-Light Uses A Photoresistor to Detect Dusk -  11/11/04  EDN Design Idea   If you need to produce extremely fast pulses in response to an input and trigger, such as for sampling applications, the predictably programmable short-time-interval generator has broad uses. The circuit of Figure 1, built around a quad high-speed comparator and a high-speed gate, has settable 0- to 10-nsec output width with 520-psec, 5V transitions. Pulse width varies less than 100 psec with 5V supply variations of 65%. The minimum input-trigger width is 30 nsec, and input-output delay is 18 nsec. . .  [by Chau Tran, Analog Devices, Malden, MA]

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]

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]

Simulate the Gyralite dual flashing headlights. -  . . .  [Designed by ML Rollins]

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