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Light Flasher
Circuits Page 8a Light Flashers:
#'sA - CD - FG - KLM - RST - Z
Last Updated on:
Monday, October 03, 2011 06:09 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
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]
Tricolor LEDs create a flashing array 24-Jun-10 Issue of EDN You
can build a matrix of RGB (red/green/blue) LEDs using a simple and
inexpensive circuit comprising the control logic and driver circuit in
Figure 1 and some LEDs (Figure 2). The center RGB LED is the first to come
on, after which each sequential LED in the 8×8-LED matrix follows.
This process gives the appearance that the display is alive and moving
outward. This sequence repeats, producing a rainbow effect of
colors..... [Design Idea by Jeff Tregre, www.BuildingUltimateModels.com,
Dallas, TX]
Two 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, a off-line…..(added 07/03)
Two Transistor LED Flasher - This circuit will flash a bright red LED
(500 mcd as an attention getting device or fake car alarm. Componten Values are
not criticl and transistors may be used. Flash duration is determined by R2….
[Bill Bowden's circuit
Two Transistor LED Flasher - This is a classic 2 transistor astable
multivibrator. Many other NPN small signal or switching transistors can be used,
including 2N4401, PN2222 or 2N2222 using the circuit on the left. The circuit can also
be inverted using PNP transistors such as 2N3906, 2N4403, PN2907, or 2N2907 as shown
to the right.... [from Bill's Electronics Reference Library]
Two-wire Lamp Flasher - Ideal to operate 3 to 24V DC existing on-circuit
lamps. LED operation is also possible. (electronic circuit added 06/07/08)
Two-wire Lamp Flasher (redcircuits) - This circuit has been designed to
provide that continuous light lamps already wired into a circuit, become flashing.
Simply insert the circuit between existing lamp and negative supply. Especially suited
for car or panel pilot lights, this device can drive lamps up to 10W(design added
11/06)
