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LED (Light Emitting Diodes) Circuits   Page 1a
LED:   #     A      B      C       D - E       F - H      I - K     L      M - O      P- R      S      T     U - V     W -Z

Last Updated on: Wednesday, November 29, 2017 05:40 AM

Circuits Designed by Dave Johnson, P.E. :
  • 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.
  • 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.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

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]
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)
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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