Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 40,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to original material posted by the designer. 
Please let us if you would like us to link to or post your design.

HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches

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. :

  • 0.5v Negative Supply -  Although not very efficient, this simple circuit, consisting of two LEDs and a photo diode, generates a negative voltage with a current level of a couple milliamps. It is ideal for supplying a negative rail to low power “rail to rail” op Amp circuits,  . . . [Circuit by Dave Johnson P.E.,  07/13/06]

  • 1 Line Telephone Line Status Indicator -  This circuit monitors one phone line . . . [Circuit by Dave Johnson P.E.,  06/10/00]

  • 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 1.5volt AA alkaline battery cell. The circuit uses a charge pump technique to provide . . . [Circuit by David A. Johnson P.E.,  06/04/00]

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

µP Displays 10 Bit Data on Three LEDs -  11/07/96 EDN Design Idea   circuit in Figure 1 uses a PIC16C55 µP to read 10-bit binary data and directly display data in decimal format on three common-cathode LED displays. If value of data exceeds 999, displays show three hyphens (---) to represent. . .  [by Yongping Xia, Philips Lighting Electronics, Torrance, CA]

 

0.3-1.5V LED Flashlight -  It's a little wisp of a circuit that allows you to drive a blue or white LED from a low voltage. Normally, if you want to light up a blue or white LED you need to provide it with 3, 3.5 V, like from a 3 V lithium coin cell. But a 1.5V battery like a AA cell simply will not work. But using the Joule Thief, it works like a charm. Not only does it work with a brand new battery, but it works until the battery is nearly dead-- down to 0. 3 V. That's well below the point where your other toys will tell you the battery is dead, so it can steal every last joule of energy from the battery (hence the name). To learn how to make one, watch the video, which is available in a variety of formats. . . .  [Evil Mad Scientists Laboratories]

 

0.5v Negative Supply -  Although not very efficient, this simple circuit, consisting of two LEDs and a photo diode, generates a negative voltage with a current level of a couple milliamps. It is ideal for supplying a negative rail to low power “rail to rail” op Amp circuits,  . . . [Circuit by Dave Johnson P.E.,  07/13/06]

 

0.6/1.6 MHz Boost Converters with 22V Inrternal FET Wsitch in SOT-34 -  Application Note LM2731 July 2003. . .  [National Semiconductor]

 

1 Cell Flashes White LED -  11-Dec-03 EDN Design Idea   Many portable appliances and other products that must operate from a single cell are restricted to working at very low voltages. It is thus difficult to drive white LEDs that typically have a forward voltage of 3 to 5V. The ability. . .  [by Anthony Smith, Scitech, Biddenham, Bedfordshire, UK]

 

1 cell lights any LED -  07/05/01  EDN Design Idea   The circuit in Figure 1 allows you to light any type of LED from a single cell whose voltage ranges from 1 to 1. 5V. This range accommodates alkaline, carbon-zinc, NiCd, or NiMH single cells. The circuit's principal application is. . .  [by Al Dutcher, Al Labs, West Deptford, NJ]

 

1 FET controls LED array -  04/12/01 EDN Design Idea   White-LED backlights are gaining acceptance because they offer higher reliability and simpler drive circuitry than backlights based on CCFL (cold-cathode-fluorescent-lamp] and EL (electroluminescent] technology. As a result, white-. . .  [by Len Sherman, Maxim Integrated Products, Sunnyvale, CA]

 

1 LED Indicates Two Power States -  12/05/96 EDN Design Idea    Uses a single bicolor LED to indicate both power-on and blown-fuse conditions. . .  [by Jim Hagerman, Hagerman Technology, San Diego, CA]

 

1 Line Telephone Line Status Indicator -  This circuit monitors one phone line . . . [Circuit by Dave Johnson P.E.,  06/10/00]

 

1 Microcontroller Pin Drives Two LEDs With Low Quiescent Current -  02/07/08  EDN Design Idea   Two simple circuits allow a battery-powered microcontroller to drive two LEDs. . .  [by Antonio Muńoz, Laboratorios Avanzados de Investigación del I3A, Zaragoza, Spain, and Arturo Mediano, PhD, GEPM University of Zaragoza, Zaragoza, Spain]

 

1.2MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT -   LT3465 switching Regulator. . .  [Linear Technology]

 

1.5 Volt 1970's Style Caboose Marker Flashing Red LED Light -  A circuit that drives a red LED from a 1.5volt battery and simulates an incandescent light. Duty cycle can be changed by selecting resistor values. . . .  [From Dick Cappels' project pages]

 

1.5 Volt Dual LED Flasher -  This 1.5volt 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. . .  [Bill Bowden designed this one]

 

1.5V battery powers white-LED driver -  09/30/04  EDN Design Idea   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. . .  [by Steve Caldwell, Maxim Integrated Products, Chandler, AZ]

 

1.5V LED Flasher -  schematic only, no circuit description at this time. . .  [Designed by Andrew R. Morris]

 

1.5V LED Flasher Oscillator -  The 8-lead plastic mini-DIP LM3909 IC was developed by National Semiconductor in the mid 'seventies of the past century. It was a monolithic oscillator specifically designed to flash Light Emitting Diodes. By using the timing capacitor for voltage boost, it delivered pulses of 2 or more volts to the LED while operating on a supply of 1. 5V or less. The circuit was inherently self-starting, and required addition of only a battery and capacitor to function as an LED flasher. . .  [Flavio Dellepiane's web site]

 

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 1.5volt AA alkaline battery cell. The circuit uses a charge pump technique to provide . . . [Circuit by David A. Johnson P.E.,  06/04/00]

 

1.5V LED Flashers -  The LED flasher circuits below operate on a single 1.5volt 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. Two sections of a 74HC04 hex inverter are used as a squarewave oscillator that establishes the flash rate while a third section is used as a buffer that charges the capacitor in series with a 470. . .  [by Bill Bowden]

 

      PAGE   Next >>>> 


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


HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy

Copyright  2002 - 2015 David A. Johnson & Associates.  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.