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Light Flasher
Circuits Page 3 Light Flashers:
#'sA - CD - FG - KLM - RST - Z
Last Updated on:
Monday, October 03, 2011 06:07 PM
Circuits Designed by Dave Johnson, P.E. :
Fake
Car Alarm Light
Whenever the car’s ignition is turned off, this circuit activates a flashing LED,
which can be positioned to appear as an active alarm system. (added 7/06)
FLASHING LED ADVERTISING BADGE #1 I have seen numerous flashing light badges at trade shows and conventions.
They are often handed out as gifts to promote some business. The devices often use
inefficient circuits, which cause the battery power source to be quickly depleted.
My circuit is simple but efficient enough to provide months of continuous LED
flashing. It also has a tiny push-button switch to turn on and off the light
flashing, extending battery power.
FLASHING LED ADVERTISING BADGE #2
This circuit is similar to flashing LED advertising badge #1. It uses a CD4013
dual D Flip/Flop IC. The 74HCT74 IC in Flashing LED Advertising Badge #1 does
not always work. As in #81, a single lithium battery will provide months of
continuous LED flashing. It also has a tiny push-button switch to turn on and
off the light flashing.
Dancing LEDs redcircuits - A LED sequencer, following the rhythm of music or
speech 9 Volt Battery-operated portable unit.....
Dark-activated LED or Lamp Flasher - This circuit adopts the rather unusual
Bowes/White emitter coupled multivibrator circuit. The oscillation frequency is about
1Hz and is set by C1 value…..(electronic design added 6/07)
Descrete Multistage Light Sequencer - The drawing below illustrates a
multistage light sequencer using descrete parts and no integrated circuits. The idea
is not new and I hear a similar circuit was developed about 40 years ago using
germanium transistors. The idea is to connect the lights so that as one turns off it
causes the next to turn on, and so forth. This is accomplished with a large
capacitor between each stage that charges when a stage turns off and supplies base
current to the next transistor, thus turning it on. Any.....(circuit added 05/09)
Dice - Press the push switch to 'throw' the dice: this makes the circuit
rapidly cycle through the dice numbers so that an effectively random dice number is
displayed by the LEDs when the push switch is released.… [Designed by John Hewes]
Disco Lights - software and hardware for controlling disco lights from your
PC (added 4/02)
Disco style Strobe Light - The stoboscope tube needs about 250-400V DC to
operate. This high voltage is generated using simple voltage step up circuit
built from transistors Q1,Q2 and transformer T1. This circuit gives out about
230V AC voltage which is then rectified with rectifying bridge U1 (must have at least
400V voltage rating) and stored to the main capacitor C1 [Circuit by Tomi Engdahl]
Dual LED Flasher - Some useful circuits using the LM555 IC. Scroll to
find the Dual Led Flasher circuit (11/06)
Dual Tandem Flashing Light Circuit Powered by a 9 Volt Battery - This
circuit is powered by a 9 volt battery, suitable for warning lights on a tall
structure. (Personally, I can't recommend you buy anything but the Rollins Railroad
Designs kit; for $4.00 you can't go wrong. The 555 IC is about $1.50 by itself at
Radio Shack). If you choose to buy all the parts yourself, realize you need ONLY two
LEDs, not two of each; you should be able to mix and match colors.....(electronic
circuit added 4/05)
Dummy alarm - Schematic only, no circuit description
Dummy Alarm - This project makes a superbright LED flash briefly once every
5 seconds to imitate the indicator light of a real alarm. The circuit is designed to
use very little current to prolong battery life so that it can be left on permanently.
This is a simple project, ideal for a beginner.....(circuit added 06/07/08) [Designed
by John Hewes]
