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Power 220V Flashing LED - AC mains operated single LED flasher circuit, built using the popular
CMOS timer chip TLC555 is shown below. The whole circuit is powered directly by the grid supply of 230VAC through
a capacitive potential divider and associated components. This minuscule Power LED Flashing circuit can be easily
fit inside a very small. . . [Circuit Posted by T.K. Hareendran]
Power flasher - There is no need to resort to complex circuitry if what you are looking
for is a simple power flasher. The light will flash at around 1Hz with a 100W bulb at a duty cycle of 50%. The
max. load that can be driven with this circuit is 200W and if you wish to have a different frequency. . .
Power Flasher (PAGE 113) - Suitable for alerting purposes. Drives 12V Car bulbs. . . [Flavio
Dellepiane's web site]
Power-line outage flashes red alert - 06/13/02 EDN Design Idea This Design Idea expands on a circuit in a
previous one to configure a power-outage detector with a flashing alarm (Figure 1, Reference 1]. The circuit
plugs into a mains outlet and uses trickle-charged nickel-cadmium batteries. The . . . [by Vasiliy Borodai,
Zaporozhje, Ukraine]
Programmable LED - Alex Inspired by various LED Throwies, blinking LEDs and similar
instructables I wanted to do my version of an LED controlled by a microcontroller. The idea is to make the LED
blinking sequence reprogrammable. This reprogramming can be done with. . .
Programmable LED Flashers - LED goes to steady state after a preset number of flashes; Two simple,
wide supply range operating circuits. . . [Flavio Dellepiane's web site]
Pulsing third Brake lite for cars - Several years ago these flashers were introduced in the automotive
industry as part of the third brake light and contained strobe lights (and strobing continuously for the duration
of pressing the break pedal) but got abandoned almost immediately sometime later because of the 'strobe' effect
it has on some people. This circuit has become obsolet since much better circuits are available these days
without the 'lag' in between brakes caused by R4 and C3.One of the circuits is listed below. . . [Tony van
Roon's circuit]
Push-bike Light - Automatic switch-on when it gets dark; 6V or 3V battery operation. . .
[Flavio Dellepiane's web site]
Push-Pull-Crossing Light Flasher - The next circuit uses a dual timer in a Push-Pull output arrangement.
While this circuit would be sightly more expensive to build, it would make the wiring of the actual flasher mount
simpler as only two connections would be neededscroll down for this circuit. . . [from Rob Paisley's Model Train
web site]
Quiz - This project can be used for a quiz with up to 4 contestants (or teams).
Each contestant has a trigger push-switch and LED. When a trigger switch is pressed it lights the corresponding
LED, sounds the bleeper and prevents the other trigger switches from working - therefore showing which contestant
was the first to press their switch. . . [Designed by John Hewes]
Railway Grade Crossing Flashers - The circuit on this page provides realistic operation of the flashing
signals at a level grade crossing. The circuit uses six photo transistors to control the operation of the
flashers and can easily supply up to four sets of LED flashers ( 8 LEDs). . . . [from Rob Paisley's Model Train
web site]
'Random' Flasher for 8 LEDs - This project uses a 4026 counter and display driver IC to flash eight
LEDs in an apparently random manner. It can be used to create a display of your choice. . . . [Designed by John
Hewes]
Rear-End Flashing Device for DCC Systems - This circuit is for a "F. R. E. D. " that is designed to be used with DCC
control systems. The circuit is based on the LM555 timer chip. . . . [from Rob Paisley's Model Train web site]
Reduced Power Sequential LED
Flasher - The 74HC4017 is a neat
decade counter which has 10 decoded outputs. When supplied with a low frequency clock and with a LED attached to
each of the outputs, an interesting ten step sequential flasher effect can be produced. The LEDs can be
configured in . . . [Hobby Circuit designed by Dave Johnson P.E., 11/30/08]
Repetitive trigger circuit - Based on the 555 timer IC, useful for strobe lights. A bit on the 4017
counter IC for multiple flashes and sequences of flashes. . . [Don K Lipstein]
Revisited-Model Train
Lighthouse Flasher - This was
originally designed for a model in a HO train set. It simulates the behavior of the light from a lighthouse. The
LED intensity gradually increases, then flashes with a bright light and finally decreases slowly in intensity . .
. [Hobby Circuit designed by David Johnson P.E., 07/12/06]
Ringing Phone Light Flasher - This is very useful in a situation were there is lots of noise and it is
impossable to hear the phone, such as a workshop. Here is such a device. The ring detect part of this circuit
came from [url]http://www. hut. fi/Misc/Electronics/circuits/telephone_ringer. html[/url]. Notes: 1. You may need
to use a lower voltage zener for D1 and D2. 2. You can use a regular relay instead of a solid state relay, but
the arcing accross the contacts may destroy it pretty quickly. 3.Be very sure that you have not accidentally
connected 120V to the phone line when building and installing this. . . [Design by Aaron Cake]
Rotating & Flashing 230V Lights - Three channels - Three operating modes; Completely ac-insulated circuit
board. . . [Flavio Dellepiane's web site]
RR
LED flasher alternating - ASCII
format. . .
Running LED - Just for fun I designed and tested two running LED circuits based on
CD4017. The first one drives a strip of six LED, while the second one works for a strip of eight LED. Both
circuits work in bidirectional running. . . [Andrea, I live in Central Italy]
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