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Light Flasher
Circuits Page 8b
Light Flashers:
#'s A - C
D - F
G - K
L
M - R
S T - Z
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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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.....
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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.….
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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]
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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]
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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]
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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]
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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....
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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] |
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Universal Flasher Circuit - LED flasher with the LM3909 IC….
[Tony van Roon's circuit] |
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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] |
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Valentine Heart - 18 LEDs flash at three different rates and you can use
these to create an eye-catching Valentine Heart for that special person! A template
for the heart shape can be downloaded. The circuit is kept simple (and low cost) by
using the 4060B IC which is a counter and oscillator (clock) in one package. The
circuit requires a 9V supply, such as a PP3 battery..... [Designed by John Hewes] |
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Various LED Blinker Circuits - The circuit uses independent timers to flash
two light emitting diodes. Any time that light emitting diode D1 is lit__light
emitting diode D2 will be switched off. Light emitting diode D3 is on if both D1 and
D2 are off.....Circuit for model railroad trains…. [from Rob Paisley's Model Train web
site] |
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Light Flashers: #'s
A - C
D - F
G - K
L
M - R
S T - Z |
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