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

 

Last Updated: August 18, 2015 06:53 AM


Circuits Designed by Dave Johnson, P.E. :
  • 10 LED Sequential Flasher using Low Powr -  A while back I posted a flasher circuit which flashed 10 LEDs sequentially. That circuit was powered by four AA alkaline cells. The circuit below operates much the same way but has been modified to run from a single 3v CR2032 lithium coin cell . . . [Circuit by David A. Johnson P.E.,  04/17/11]

 

  • 120 VAC / 240 VAC Indicator -  Two LEDs indicate if a power line has 120vac or 240vac voltage on it . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/09/06]

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

10 Channel LED Sequencer -  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). . .  [Bill Bowden's website]

 

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. . .  [Circuit designed by Aaron Cake]

 

10 LED Sequencer -  Schematic only, text in Finnish. . .  [Designer's name not given]

 

10 LED Sequential Flasher using Low Powr -  A while back I posted a flasher circuit which flashed 10 LEDs sequentially. That circuit was powered by four AA alkaline cells. The circuit below operates much the same way but has been modified to run from a single 3v CR2032 lithium coin cell . . . [Circuit by David A. Johnson P.E.,  04/17/11]

 

10 Stage LED Sequencer -  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). . .  [Bill Bowden's website]

 

10 Stage Light Sequencer -  schematic only -- flashes 10 low voltage bulbs, operates at10-25-Volt voltage, in PDF format, text in Finnish. . . 

 

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 -   LTC3201. . .  [Linear Technology]

 

11 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 by using sucessive stages of the 4017 counters. For example, to expand the circuit to 60 LEDs for displaying minutes or seconds of a clock, the rows counter could be reset from pin 12 (carry out) rather than pin 1 as shown, and the columns. . . .  [Designed by Bill Bowden]

 

12 Stage Neon Sequencer NE 2/NE 51 -  This circuit is similar to the LED clock using 12 neon indicator lamps instead of LEDs. It operates from 2 high capacity ni-cad cells (2.5volts) which keep it going for a couple weeks. High voltage (70 volts) for the neon lamps is obtained from a small switching power supply using a 74HC14 Schmitt trigger squarewave oscillator, high voltage switching transistor. . .  [Bill Bowden's circuit]

 

12 Volt Knight Rider LED display -  These circuits will give provide a Good Effect, duplicating the Knight Rider Lights. . .  [G.L. Chemelec]

 

120 & 240VAC LED Voltage Indicator -  Useful for power lines control. Simple, transformerless circuitry. . . .  [Flavio Dellepiane's web site]

 

120 VAC / 240 VAC Indicator -  Two LEDs indicate if a power line has 120vac or 240vac voltage on it . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/09/06]

 

120VAC Lamp Chaser Using Solid State Relays -  This circuit is basically the same as the 10 channel LED sequencer with the addition of solid state relays to control the AC lamps. The relay shown in the diagram is a Radio Shack 3 Amp unit (part no. 275-310) that requires 1. 2 volts DC to activate. No current spec was given but I assume it needs just a few milliamps to light the internal LED. . . .  [Bill Bowden, designer]

 

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


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Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


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