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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 . . . [Circuit by David A. Johnson P.E., 07/09/06]
TB060: Drive High Intensity White LEDs Efficiently using the PIC16C781 - Application Note Published 17-Jul-02. . . [Microchip]
TB062: High Power IR LED Driver using the PIC16C781/782 - Application Note Published 26-Sep-02. . . [Microchip]
Telephone in Use LED
Indicator - . . . [Bill Bowden, designer]
Telephone in Use Light - ASCII
format . . .
Telephone In-Use LED
Indicator - Circuit to illuminate an LED when any
telephone extension is off the hook. . . . [Bill Bowden's circuit]
Ten 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]
Ten-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]
Ten-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]
Ten-LED Sequencer - Schematic only, text in Finnish. . .
[Designer's name not given]
Ten-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 Dave Johnson P.E., 04/17/11]
Test Continuity
With An LED - 01/06/11 EDN Design Idea Test circuits
for resistance against a preset limit. . . [by Raju R Baddi, Raman Research Institute, Bangalore, India]
Tester for Pulsed
LEDs - This circuit is designed to test visible and
infrared LEDs in pulsed mode operations. It can drive the LED with peak currents in excess of 10 Amps. A light
detector nearby can monitor the response time and intensity of the LED under test . . . [Hobby Circuit designed
by David Johnson P.E., 06/17/00]
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/Augu, 2010]
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, . . .
Thermal Performance of the LM3404/04HV in SO-8 and PSOP-8 Packages (Rev. A) - LED lighting designers are challenged with meeting their efficiency and reliability goals
faster in advanced LED lighting designs. LED lighting customers seeking the latest in innovative and affordable
LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power
management devices, wireless and wired interface control and embedded processors. LED designers have the option
of not only controlling the power stage, but regulating LED currents as well, eliminating the need for multiple
components and reducing system cost. . . . [Texas Instruments App Notes, 1-May-13]
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/Augu, 2010]
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 - 12/15/06 EDN Design Idea Engine tachometer uses few components and I/O lines. . . [by
Nedjeljko Lekic and Zoran Mijanovic, University of Montenegro, Department of Electrical Engineering, Podgorica,
Montenegro]
Three Volt
Universal LED Flasher - The circuit below will flash
any LED color with fixed current pulses powered by a 3v battery. It uses a charge pump approach, which routes a
constant current pulse through the LED, regardless of the LED voltage requirement. Using this approach, white and
. . . [Hobby Circuit designed by David A. Johnson P.E., 06/22/08]
Three-Channel White-LED Driver Uses Simple Step-Down DC/DC Converter - 09/13/12 EDN Design Idea Drive multiple LEDs with current mirrors from a single step-down
converter. . . [by Nora Jacalan Esteves, Technor Semiconductor LLC, Pleasanton, CA ]
Three-Colour
Display using Bicolour LEDs - . . .
Three-Minute
Closet Light - I have a coat closet by my front door.
The thing is very dark at night and really needs some kind of illumination inside. I could hire an electrician to
install a light in the closet ceiling and then wire it to a toggle switch outside the door but that would cost me
quite a bit of money . . . [Circuit by David Johnson P.E., 12/25/11]
Three-Volt Low Battery Voltage Flasher - Many battery
powered devices use two AA alkaline cells. Often you will not know when it is time to replace the batteries until
the device powered by them actually stops operating. The hobby circuit below can be connected to a 3v battery, to
give you some . . . [Hobby Circuit designed by David A. Johnson P.E., 01/01/98]
Three-Volt Powered Super Bright LED Flasher - I have
posted several kinds of LED flashers over the years. This is yet one more flasher, designed to flash any high
power LED of any color. It hits the LED with a 25ms 250ma pulse once every 2 seconds. This works out to an
average current about 3ma. It . . . [Hobby Circuit designed by David A. Johnson P.E., 04/22/09]
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