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Light Emitting Diodes (LED) Circuits
LEDs:   #'s - B     C - G      H - L       M - P       Q - T     U - Z 
 

Last Updated: November 29, 2017 05:40 AM


Circuits Designed by Dave Johnson, P.E. :
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Safety Light -  My 1200 square foot metal shop only has one small entrance door and no skylights. If the lights are turn off while inside, there is not enough light to safely find the door to exit the building. On a couple occasions, while I was quietly working at my test bench, my wife would walk into the shop, grab a garden tool and rush back out, turning off the lights and closing the door without thinking . . . [Hobby Circuit designed by Dave Johnson P.E.,  11/29/04]

 

Shop Safety Light -  My 1200 square foot metal shop only has one small entrance door and no skylights. If the lights are turn off while inside, there is not enough light to safely find the door to exit the building. On a couple occasions, while I was quietly working at my test bench, my wife would walk into the shop, grab a garden tool and rush back out, turning off the lights and closing the door without thinking . . . [Hobby Circuit designed by David A. Johnson P.E.,  11/29/04]

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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
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SAA1064 display module project -  . . . 

 

Safety Flasher -  This circuit alternately flashes two high-brightness LEDs as a safety measure during jogging or walking. The LED’s can be mounted on clothing or a belt. The circuit draws a precisely controlled 10mA in order to conserve battery life. Also, the battery vol. . .  [Designed by Andrew R. Morris]

 

Safety Light -  My 1200 square foot metal shop only has one small entrance door and no skylights. If the lights are turn off while inside, there is not enough light to safely find the door to exit the building. On a couple occasions, while I was quietly working at my test bench, my wife would walk into the shop, grab a garden tool and rush back out, turning off the lights and closing the door without thinking . . . [Hobby Circuit designed by Dave Johnson P.E.,  11/29/04]

 

Schematic and breadboard layout for reversed LED color sensor using an opamp -  . . . 

 

Scheme provides high-side current-sensing for white-LED drivers -  02/19/04  EDN Design Idea   White LEDs find wide use in backlighting color-LCD screens in most portable devices, such as cellular phones, PDAs, and MP3 players. Multiple LEDs often connect in series to ensure that the same current flows through every LED. To . . .  [by Dimitry Goder, Sipex Corp, San Jose, CA]

 

Secondary Colors from Multicolored Leds -  07/24/03  EDN Design Idea   One disadvantage of generating a yellow color by mixing two primary-color light sources is that the LED must use twice the current because both the red and the green LEDs must be on. . .  [by Claude Haridge, Stittsville, ON, Canada]

 

Selecting of LED projects including a flashing Christmas tree -  . . . 

 

Self-Oscillating H Bridge Lights White LED from One Cell -  11/26/09  EDN Design Idea   Circuit operates on batteries as low as 0. 6V. . .  [by Luca Bruno, ITIS Hensemberger Monza, Lissone, Italy]

 

Senses & displays ambient light intensity -  11/09/06 EDN Design Idea   LED doubles as photosensor and visual indicator of ambient-light intensity. In addition to their customary roles as indicators and illuminators, modern LEDs can also serve as photovoltaic detectors (reference 1 and reference 2). Simply connecting a red LED to a multimeter and illuminating the LED with a source of bright light, such as a similar red LED, produce a reading of more than 1. 4V (Figure 1). One model for a reverse-biased LED comprises a charged capacitor that connects in parallel with a light-dependent current source (Reference 1). Increasing the incident light increases the current source and more rapidly discharges the equivalent capacitor to the supply voltage. . .  [by Dhananjay V Gadre and Sheetal Vashist, ECE Division, Netaji Subhas Institute of Technology, New Delhi, India]

 

Sequential Brake/Turn Lights -  Bar-mode LED-cluster sequencer; Can drive up to 16 clusters. . .  [Flavio Dellepiane's web site]

 

Sequential flashing arroW circuit using a 4017, also includes a PCB layout -  . . .  

 

Sequential LED Flasher -  for 10 LEDs. . . .  [Tony van Roon's circuit]

 

Serial Comms to LED Driver -  . . .  [by Airborn Electronics, Australia]

 

Series Connected Voltage Boost Circuit for a Battery Operated LED Lantern -  A circuit that goes in series with a white LED and a 1.5volt cell to make > 3 Volts to drive a white LED. . .  [From Dick Cappels' project pages]

 

Series White LED Driver -  Application Note LM3590 November 2003. . .  [National Semiconductor]

 

Set LEDs’ Hue from Red to Green -  10/21/10 EDN Design Idea by varying the current through red and green LEDs, you can vary the hue in 32 steps. . .  [by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia]

 

Seven Component Regulated LED Lamp -  . . .  [Designer's name not included]

 

Seven Component Regulated LED Lamp -  . . . 

 

Seven-Colour LED Lighting -  Presented here is a simple circuit that uses six red, green and blue (RGB) LEDs to generate a running-light effect in seven colours-blue, green, red, cyan, yellow, magenta and white. The RGB LEDs have four pins, one for each colour and a common cathode. Different colours can be produced by mixing the primary colours (i. e. , red, green and blue). . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved]

 

Shop Safety Light -  My 1200 square foot metal shop only has one small entrance door and no skylights. If the lights are turn off while inside, there is not enough light to safely find the door to exit the building. On a couple occasions, while I was quietly working at my test bench, my wife would walk into the shop, grab a garden tool and rush back out, turning off the lights and closing the door without thinking . . . [Hobby Circuit designed by David A. Johnson P.E.,  11/29/04]

 

Signal Processor Adds LED Display -  06/06/96  EDN Design Idea   Designers using the Texas Instruments TSS400, a versatile 4-bit sensor-signal processor, may find the circuit in Figure 1 useful as a replacement for, or an adjunct to, the IC's built-in display capabilities. . .  [by N Thomas Christman, Zablocki VA Hospital, Milwaukee, WI]

 

Signboard -  On this page, I will introduce the electronic signboard with PIC16F84A. The message is displayed to flow on the left from the right. 128 LEDs are used for this board. . .  [Seiichi Inoue's Web Site]

 

Signboard 2 -  Iwill introduce the making of the electronic signboard which used PIC16F84A on thses pages. 112 LEDs (7 x 16) are used for the display of the message. 50 LEDs are used as the design of the edge. Latch registers by CPLD are used for the display of the LEDs. . . .  [Seiichi Inoue's Web Site]

 

Simple Battery-Status Indicator Uses Two LEDs -  08/12/10  EDN Design Idea   Use LED brightness to indicate battery charge. Properly maintained rechargeable batteries can provide good service and long life. Maintenance involves regular monitoring of battery voltage. The circuit in Figure 1 works in most rechargeable batteries. It comprises a reference LED, LEDREF, which operates at a constant current of 1 mA and provides reference light of constant intensity regardless of battery voltage. It accomplishes this task by connecting resistor R1 in series with the diode. Therefore, even if the battery voltage changes from a charged state to a discharged state, the change in current is only 10%. . .  [by Abhijeet Deshpande, People’s Education Society Institute of Technology, Bangalore, India]

 

Simple Circuit drives latching relays -  02/01/96  EDN Design Idea   Figure 1 shows a low-parts-count circuit that can drive one- or two-coil latching relays. Latching relays are useful in sensitive analog designs. The 74ACT174 hex flip-flop has ample capability to drive the Aromat TQ2E series of . . .  [by Roy McCammon, 3M Austin, TX]

 

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LEDs:   #'s - B     C - G      H - L       M - P       Q - T     U - Z 


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