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Light Flasher
Circuits Page 5a
Light Flashers:
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Last Updated on:
Thursday, November 30, 2017 07:41 AM |
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Circuits Designed by Dave Johnson, P.E. : |
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Lighthouse LED 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.
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Line Powered White LED Array
There has been a lot of excitement lately in the lighting industry. Some
companies are beginning to manufacture general lighting fixtures, which replace
incandescent and fluorescent lamps, using LED lights. When proper heat
management is designed into the light fixtures, these LED lights can produce more
light with less electricity and last much longer than other devices. They can
also operate well in cold temperatures. Some of these new lighting fixture
designs use a large number of white LEDs, wired into long series wired string
arrays. The circuit below is designed to provide a regulated DC voltage for
these strings.
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LOW BATTERY VOLTAGE FLASHER
This circuit is designed to monitor two alkaline cells (3v) that from 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
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LED flasher - Schematic only, no circuit description |
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LED Flasher - I made LED flash circuit which is often used as the PIC
software making practice. This circuit controls the blink of eight LEDs with the
software of PIC. The blinking pattern can be changed with five switches. ….....
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LED Flasher - This two LED flasher circuit uses any DC supply from 3V to
12V. Flash rate is controlled by R1,C1 and R2,C2. Larger values create slower fash
rates, smaller values higher flash rates….. [Evin Devore] |
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LED Flasher - Based on the Maxim MAX660, designed to power three 3mm/5mm
white LED's from 3V (1.5V min) , intended for replacing incandescent bulbs in small
torches….) [Submitted by Andre] |
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LED Flasher & TRAC Pulser work Off AC Line - 15-Jan-98 Issue of EDN A
flashing LED is an excellent visual alarm. Unfortunately, the LED is a dc device and
requires additional circuitry to operate from an ac source. Several circuits can
perform the necessary function, but the circuit in Figure 1a is the most
efficient....This File contains several Design Ideas, please scoll to this one.....
[Design Idea by Dennis Eichenberg, Parma Heights, OH] |
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LED Flasher (Colin Mitchell) - This is a very simple project using a printed
circuit board and 8 components. It will flash an ordinary 3mm or 5mm (1/8" or 1/4")
LED at a rate of about one flash per second….(circuit added 4/08) |
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LED Flasher 2 Transistor
- This circuit will flash a super-bright LED (5000+ mcd). Good for fake car
alarm or other attention getting device. Component values are not critical, try
anything else first from your junkbox. Obviously, the 470 ohm resistor (R3)
determines the LED's brightness and limits the current flow to about 20mA. 390 ohm can
also be used as a save value. If you decide to go with a green or yellow led, which
draw more current, you may want to replace the 470 ohm with an appropriate value.
Flash rate is determined by R2 and C1..... [Tony van Roon's circuit] |
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LED flasher checks fiber-optic strands - 7-Jan-10 Issue of EDN Send
visible light through strands to check for breaks..... [Design Idea by Edwin A Mack,
Port Republic, NJ] |
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LED Flasher indicates Low Battery Condition - 01/02/97 EDN-Design
Ideas.....Many portable electronic devices could benefit from a visual indication when
their battery requires replacement. Typical low-battery indicators simply turn on an
LED when the battery voltage drops below a certain value. Such circuits actually
accelerate the battery's extinction by drawing excessive current. The circuit in
Figure 1 draws a mere 1 m A in its standby mode and averages only 20 m A when
activated. The low current imposes a minimal burden on any battery circuit. An
off-the-shelf, undervoltage sensor IC (IC1) monitors the battery voltage..... [Design
Idea by David Johnson, Consultant, Littleton, CO] |
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LED Flasher Tony van Roon) - Flasher uses LM3909 IC…. [Tony van Roon's
circuit] |
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LED Flasher with a Slow Rise & Fall Time - A Simple Circuit Using a
555.....(design added 12/08) |
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LED Flashing sweetheart kit - LED Flashing sweetheart kit..... |
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LED or Bulb flicker shimmer randomly like candle flame or fire - This may
well be the world's only discreet logic circuit to generate truly random output. It
makes an excellent candle flicker light for your Halloween pumpkin, and looks much
more authentic than a shimmer light wherever a good a simulated flame effect is
required. I do not guarantee the accuracy or safety of any information herein.
(added 2/05) [Circuit by Stepan Novotill] |
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Light Flashers: #'s
A - C
D - F
G - K
L
M - R
S T - Z |
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