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Light Flasher
Circuits Page 8 Light Flashers:
#'sA - CD - FG - KLM - RST - Z
Last Updated on:
Monday, October 03, 2011 06:08 PM
Circuits Designed by Dave Johnson, P.E. :
Three Volt Low Battery
Voltage Flasher
This circuit is designed to monitor two alkaline cells (3v) that form the
battery often used in portable electronic equipment. It use an
inexpensive IC from Panasonic that is connected to an efficient LED flashing
circuit. When the battery voltage drops below a certain point the
circuit flashes the LED. In the off state the circuit draws only 1uA,
while in the active flashing state it draws 20uA. Published in
EDN, Jan 2, 1997 [Designed by David A. Johnson]
Ultra Low Power LED
Flasher
The efficiency of some newer LEDs is amazing. Some of the latest green
LEDs can launch blinding light with just one milliamp of current. I
take advantage of one of these newer devices in the circuit below. The
flashing circuit uses a classic multivibrator oscillator, made from a tiny
National Semiconductor’s LMC7215 low power voltage comparator. The
circuit produces a short 10ms pulse every two seconds, drawing power from a
3v supply. I suggest using a surface mounted green LED from Kingbright....
[Hobby Corner Circuit by Dave Johnson]
Ultra Low
Current 3v LED Flasher #3
This circuit takes advantage of a tiny LMC7215 low current draw voltage
comparator from National Semiconductor and a super efficient green LED from
King Bright. The 3v powered circuit forms a classic pulse generator
circuit, which drives the LED. The pulse width is set at about 20ms, the
pulse rate is about 0.5Hz and the peak LED current is only 100ua. This
means the average LED current is only 1ua. The overall current draw from the
3v supply is only about 2ua. This circuit might be handy to include in a
flashlight, to it can be located in the dark. The current draw is so low
that the circuit can be powered by a tiny battery for years.
Universal Flasher Using a
Latching Relay
This circuit is powered by a 9v battery and controls any AC to DC load
through a set of relay contacts, rated at 10 amps. To conserve power,
the circuit uses a latching relay. A variable frequency oscillator
controls the flashing speed from 0.2Hz to 2Hz. A pair of pulse
generators first latch the contacts closed then unlatches them open.
The power consumption is so low that a 9v battery will last for several
months. …. [Hobby Corner Circuit by Dave Johnson]
Universal LED Flasher
This low power LED flasher circuit draws about 100ua from any DC power
supply ranging from 3 volts to 24 volts. The 1.0Hz 10ms LED pulsed
current is held to a constant 10ma.... [Designed by David A. Johnson]
Universal
Flasher using Latching Relay: This circuit is powered by a 9v battery
and controls any AC to DC load through a set of relay contacts, rated at 10
amps. To conserve power, the circuit uses a latching relay. A
variable frequency oscillator controls the flashing speed from 0.2Hz to 2Hz.
A pair of pulse generators first latch the contacts closed then unlatches them
open. The power consumption is so low that a 9v battery will last for
several months.
Wig/wag LED Flasher
This simple circuit will flash two LEDs in an alternating fashion.
Wireless LED Flasher
There are times when you would like to flash a LED through a thick plastic case
without wires. The circuit below performs this feat. It can be
powered from a supply ranging from 3v to 6v. It draws about 300ua of average
current at 5v. It uses a low power op amp as a pulse generator. A negative
going pulse from that generator gates a power oscillator on for about 20ma.
That oscillator is connected to a series resonant circuit, which drives a small
coil....
The LED Flashing Sweetheart Kit - When was the last time you
gave a gift you made yourself? Elementary school? Get off the consumerist
fast track and quit copping out with inferior gifts like candy and
flowers. The LED Flashing Sweetheart Kit contains a circuit board, 28
LEDs.....
Third Brake Light Pulser - 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..... [Tony van
Roon's circuit]
Traffic Light - A two-way traffic light using a CMOS 4017 and
555. To be used as toy only… [Jose Pino]
Traffic Light - This project operates red, amber and green LEDs
in the correct sequence for a single UK traffic light. The time taken for
the complete red, red & amber, green, amber sequence can be varied from
about 7s to about 2½ minutes. A 4017 counter is used to produce the
traffic light sequence and this project could be adapted..... [John Hewes]
Traffic Light 2 - A two-way traffic light using a CMOS 4017 and 555. To be
used as toy only… [Jose Pino]
Traffic Light Control Circuit 74145 - This page features a circuit that has
twenty open collector outputs that turn on one at a time in a continuous sequential
manner. The circuit make use of the 74LSxx family of TTL integrated logic devices. The
circuits… [from Rob Paisley's Model Train web site]
Transistor Flasher - The basic
two-transistor flasher shown below has found its way into dozens of applications due
to its simplicity and versatility. Applications have included such diverse circuits as
a micropower low battery indicator, a lightning detector, …..(added 07/07/07)
Transistor LED Flasher - A simple LED flasher that uses only two
transistors, one capacitor and one resistor. This basic oscillator can have
other simple applications. [designed by Jose Pino]
Transistor LED flasher - This circuit has a lot going for it. For one thing,
it only consists of two transistors, two capacitors and four resistors. That also
means it consumes very little power. You can control the flash rate by changing the
size of the 100k resistors (100k makes for a pretty slow rate). You can also control
the duty cycle by using resistors of different values on the two sides.....(added
10/05)
Transistor Organ - This simple circuit can provide hours of enjoyment as you
learn tunes, play duets or just make some really weird sounds by pushing all the
buttons at once. You have probably seen this circuit before, it is fairly common. I
have seen it in several… [Designed by Aaron Cake]
