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1.5 Volt 1970's Style Caboose Marker Flashing Red LED Light - A
circuit that drives a red LED from a 1.5 volt battery and simulates an
incandescent light. Duty cycle can be changed by selecting resistor
values….(schematic / circuit added 6/07) |
1.5 Volt Dual LED Flasher - This 1.5 volt led fasher runs more
than a year on a single 'd" cell and alternately flashes 2 LEDs at about a
1 second rate. The circuit employs a 74HC14 CMOS hex inverter that will
operate at very low voltages (less than 1 volt). One section is used as a
squarewave oscillator (pins 1 and 2), while the others are wired to
produce a short 10mS pulse.....(schematic added 5/09) |
1.5 Volt LED Flashers (Bowden) - The LED flasher circuits below
operate on a single 1.5 volt battery. The circuit on the upper right uses
the popular LM3909 LED flasher IC and requires only a timing capacitor and
LED. The top left circuit, designed by Andre De-Guerin illustrates using a
100uF capacitor to double the battery voltage to obtain 3 volts for the
LED..... [by Bill Bowden] |
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1.5V LED
Flasher - schematic only, no description provided as this time...[Circuit designed
by Andrew R. Morris] |
1.5V battery powers white LED driver - 30-Sep-04 Issue of EDN Although
white LEDs are common in a variety of lighting applications, their 3 to 4V
forward-voltage drop makes low-voltage applications challenging. Charge pumps and
other ICs are available for driving white LEDs, but they generally don't work with the
low supply voltage of 1.5V in single-cell-battery applications..... [Design Idea by
Steve Caldwell, Maxim Integrated Products, Chandler, AZ] |
1.5V LED Flasher Oscillator - The following table shows the features of
several LED flasher circuits obtained by changing C or R parts (drawn in red color in
the diagram) and voltage supply. The LED (D) should be preferably of the red type.
….(electronic schematic added 11/08) |
1.5V LED Flasher Version A - Many published circuits that Flash LEDs need 3
volts or more. This circuit uses only a single inexpensive C-MOS IC and Flashes
the LED for a full year on a single 1.5 volt AA alkaline battery cell. The circuit
uses a charge pump technique to provide the LED the needed voltage. …. [Hobby Corner
Circuit by Dave Johnson] |
1.5v LED Flasher Version B - To squeeze even more energy from a alkaline
battery cell, this circuit adds two transistors to a circuit similar to the above
design to boost the efficiency. A small 1.5 volt alkaline N cell should Flash the LED
for a full year. It too uses a "charge pump" technique to provide a LED the needed
voltage..... [Designed by David A. Johnson] |
10 LED Chaser - I don't know why, but people like blinking lights. You see
LED chasers everywhere, in TV shows (Knight Rider), movies, and store windows.
This schematic is my version of a simple 10 LED chaser. There is no 555 timer used
because.....(electronic design added 09/08) |
10 LED Sequencer - in PDF format, text in Finnish (added 4/02) |
10 Stage LED Sequencer (Bowden) - The 4017 is a CMOS decade counter with 10
decoded outputs. Inputs include a clock (pin 14), a reset (pin 15), and a clock
inhibit (pin 13)….(design added 5?09) |
10 Stage Light Sequencer - schematic only -- flashes 10 low voltage bulbs,
operates at10-25-Volt voltage, in PDF format, text in Finnish (added 4/02)
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10 to 100 LED Sequencer Using a Matrix - The circuit above illustrates
using a 10x10 matrix to sequence up to 100 LEDs with just three ICs and 20
transistors. The two 4017 decade counters control the 10 rows and 10 columns so that
one LED is selected depending on the output of the decade counters. The LED circuit is
drawn showing 25 LEDs and 10 transistors but can be expanded up to a 100..... [Bill
Bowden's website] |
10, 8 And 6 Step LED Circuits (CD4017) - Each time switch S1 is closed the
count on the CD4017 advances by 1 step and the coresponding LED turns on….Circuit for
model railroad trains…. [from Rob Paisley's Model Train web site] |
100ma UltraLow Noise Charge Pump LED Supply with Output Current Adjust -
Linear Technology LTC3201.....[App Note] |
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