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LED (Light Emitting Diodes) Circuits   Page 12
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Last Updated on:
Monday, October 03, 2011 06:08 PM

Circuits Designed by Dave Johnson, P.E. :

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

Table Lamp With Auxiliary 12v Automotive Style LED Light -  This circuit provides about one watt of non-isolated DC power for an automotive type 12v LED array lamp in addition to a standard incandescent table lamp. …. [Designed by David A. Johnson]
TB060: Drive High Intensity White LEDs Efficiently using the PIC16C781 -  Microchip Application Note Published 17-Jul-02  (app note added 2/06)
TB062: High Power IR LED Driver using the PIC16C781/782 -  Microchip Application Note Published 26-Sep-02  (app note added 2/06)
Telephone in Use LED Indicator -  (electronic circuit added 7/03)
Telephone in Use Light -  ASCII format (electronic circuit added 7/03)
Telephone In-Use LED Indicator -  Circuit to illuminate an LED when any telephone extension is off the hook. [Bill Bowden's circuit]
The LED Flashing Sweetheart Kit -  When was the last time you gave a gift you made yourself? Elementary school? Get off the consumerist fast track and quit copping out with inferior gifts like candy and flowers. The LED Flashing Sweetheart Kit contains a circuit board, 28 LEDs.....
The LM3410 LED Driver -  The LM3410 IC is a constant current LED driver useful in either boost converter or SEPIC design applications. A SEPIC (Single Ended Primary Inductance Converter) design allows the power supply’s output voltage to be set above, below or equal to its input voltage….must register on this site.... [Published in Elecktor July/August 2010]
The Propeller a mechanically scanned LED clock  -  .....
The Ultimate Universal Remote Control -  Gadget Freak Case 147:  Couch potatoes should be particularly interested in Bill Bowden's remote control IR receiver, which allows users to control the power of virtually any electrical appliance (including those not equipped for remote) using their standard remote control. It's based on an IR receiver circuit,
Thermometer with Four-Digit LED Display -  Until recently, the Philips SAA1064 LED driver IC has been a sort of unofficial standard for driving seven-segment LED displays. It can be used to implement four-digit displays that can be driven over an I2C bus….must register on this site.... [Published in Elecktor July/August 2010]
Three Fake Alarms -  Flashing LEDs can be used to create the impression that an alarm has been fitted. Or they can be used in conjunction with a real alarm, to warn-off a potential thief. These three small circuits will flash anything from a single LED, up to 90 LEDs and beyond, with a variety of speeds and patterns..... [Ron J.'s circuit]
Three Flashing LED Doorbells -  These circuits combine a buzzer with one or more LED displays. When the push switch is operated, the buzzer will sound and the LEDs will flash. When the switch is released, the buzzer will stop, but the LEDs will go on flashing for another 30 seconds or so.,,, [Ron J.'s circuit]
Three microcontroller ports drive 12 LEDs -  15-Dec-06 Issue of EDN  Engine tachometer uses few components and I/O lines..... [Design Idea by Nedjeljko Lekic and Zoran Mijanovic, University of Montenegro, Department of Electrical Engineering, Podgorica, Montenegro; Edited by Brad Thompson and Fran Granville]
Three-Colour Display using Bicolour LEDs -  .....
Tiny Efficient High Power LED Camera Flash Solutions for Cell Phone Applications -  Linear Technology Design Note 231.....[App Note]
Tiny Regulators Drive White LED Backlights -  Linear Technology Design Note 231.....[App Note]
Torch Circuits-LED -  A LED torch is one of the simplest projects you can build and it's very interesting as it uses a super-bright white LED. In the history of LED production, red LEDs were the first to be invented and their output was so dim you could barely see if they were illuminated. You needed a darkened room to see them at all.....(circuits added 08/08/08)
TPS6102x Boost Converter Down Conversion Mode -  TI Application Note  (added 2/06)
TPS61040 Inverter Design Rev. A -  TI Application Note  (added 2/06)
TPS61042 Dual Li-ION & Higher Input Voltages -  TI Application Note  (added 2/06)
TPS61042 White Light LED Driver Boost Converter Rev. A -  TI Application Note  (added 2/06)
Transistor LED Flasher -  A simple LED flasher that uses only two transistors, one capacitor and one resistor.  This basic oscillator can have other simple applications. [designed by Jose Pino]
Transistor LED flasher -  This circuit has a lot going for it. For one thing, it only consists of two transistors, two capacitors and four resistors. That also means it consumes very little power. You can control the flash rate by changing the size of the 100k resistors (100k makes for a pretty slow rate). You can also control the duty cycle by using resistors of different values on the two sides.....(added 10/05)
Tricolor LEDs create a flashing array 24-Jun-10 Issue of EDN  You can build a matrix of RGB (red/green/blue) LEDs using a simple and inexpensive circuit comprising the control logic and driver circuit in Figure 1 and some LEDs (Figure 2). The center RGB LED is the first to come on, after which each sequential LED in the 8×8-LED matrix follows.  This process gives the appearance that the display is alive and moving outward.  This sequence repeats, producing a rainbow effect of colors..... [Design Idea by Jeff Tregre, www.BuildingUltimateModels.com, Dallas, TX]
Trip the Light Fantastic with LED Gadget Freaks -  Here is a collection of the best LED gadgets that have made themselves home in Gadget Freak…..(circuit added 08/08)
Two LEDs Perform Rudimentary Spectral Analysis -  09/01/94 EDN-Design Ideas.....A pair of LEDs having different wavelengths can supply the stimulus for a rudimentary spectral analysis during quality-control sorting operations. By measuring the reflectance of each LED, the circuit in Fig 1 can provide information about the spectral response of the object under test. The circuit's..... EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
Two Signals Easily Control Tricolor LED -  09/14/95 EDN-Design Ideas..... EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
Two Transistor LED Flasher -  This circuit will flash a bright red  LED (500 mcd as an attention getting device or fake car alarm.  Componten Values are not criticl and transistors may be used.  Flash duration is determined by R2…. [Bill Bowden's circuit
Two-LED Pilot Light -  230 or 115 Vac mains operated Very simple circuitry.....


LED:   #     A      B      C       D - E       F - H      I - K     L      M - O      P- R      S      T     U - V     W -Z
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