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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-Phase Motor Driver Prevents Stall
- 01/05/95 EDN Design Idea The circuit in Fig 1 drives a small 24V, 50-Hz
motor at about 30 to 40 Hz for use as a chopper motor. The best starting speed for the motor is about half the
final running speed. Therefore, the circuit uses an intermediate speed . . . [by PM Kirk[by, Crumpsall
Electronics, Surrey, England]
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]
Timed Uncoupling Ramp Driver (LM555)
- Circuit for model railroad trains. . . . [from Rob Paisley's
Model Train web site]
Timer chip makes universal solenoid drive
- 09/01/95 EDN Design Idea Mechanical actuators that develop a force from
magnetic interaction operate efficiently with high power until seated (the pull-in state). You should then reduce
the power to a lower holding level. These rules are especially true . . . [by Richard Panosh, Vista,
Bolingbrook, IL]
Tiny Regulators Drive White LED Backlights - Design Note
231. . . [Linear Technology]
TLC5940 PWM dimming provides superior color quality
in LED video displays - 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, 18-Apr-06]
TPS60230 WLED Charge Pump - 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, 9-Nov-05]
TPS61042 White Light LED Driver Boost Converter Rev. A
- TI Application Note. . .
Transistor relay driver
- Schematic only, no circuit description. . . [Designer's name not given]
Transistors Drive LEDs to Light the Path - 01/06/11 EDN
Design Idea Replace power-hungry incandescent bulbs with LEDs and reduce energy consumption. . . [by Eliot
Johnston, Comnet International, Richardson, TX
Transmission Line Drivers & Receivers for
TIA/EIA Standards RS-422 & RS-423 - Application Note. .
. [National Semiconductor]
Transmit to a Remote LED
Indictor Light - There are times when you would like
to transmit a signal from one LED indicator light to second LED at another location. The circuit below works well
for this application. It takes advantage of the fact that the internal infrared LED inside an opto-isolator . . .
[Hobby Circuit designed by David Johnson P.E., 12/28/08]
TRIAC Dimmable 20W Offline LED Driver Using the
LT3799 - This circuit shows a complete LED driver
solution. The LT3799 senses the output current from the primary side switch current waveform. The IC regulates
the output current by adjusting the peak switch current and the duty cycle through a novel feedback control.
Unlike other primary side sensing methods that need to know input power and output voltage information, this new
scheme provides much better output current regulation since the accuracy is barely affected by transformer
winding resistance, switch RDS (ON) , output diode forward voltage drop and LED cable voltage drop. . . [Linear
Technology App Note - , Jul 1, 2011]
Two channel Audio Amplifier drives stepper motor
- 12/01/06 EDN Design Idea Pulse-width-modulated stereo power Amplifier
saves components. . . [by Phill Leyva and Bill Quach, Maxim Integrated Products, Sunnyvale, CA]
Two Channel Gate Driver for
Large IGBT Modules - The BG2A is a fully isolated two
channel gate drive Circuit designed for use with dual IGBT modules. The BG2A utilizes Powerex VLA500-01 or
VLA502-01 hybrid gate drivers to provide efficient switching of modules rated up to 1400A. The hybrid gate driver
features a built-in high speed opto-coupler, short circuit protection and an isolated DC to DC converter with
2500VRMS isolation. . . .
Two Components Drive Stepper Motor
- 01/19/95 EDN Design Idea The extremely simple circuit in Fig 1 drives a
stepper motor directly from 120V ac, 60 Hz. Usually you need switched-dc voltages to drive a stepper motor. But a
stepper motor will run off ac lines if you introduce a 90° phase shift between the voltages. . . [by Carl
Spearow, Basler Electric,m Highland, IL]
Two PIC pins drive
six LEDs - 06/09/14 EDN Design Idea Here’s a take on
LED multiplexing with minimal output pins. This Design Idea demonstrates a new method of driving six LEDs with
only two I/O lines from a microcontroller, and so is particularly suitable for any pin-limited chip. It uses a
pair of I/O lines combined with a pair of complementary bipolar transistors. . . [by Benabadji Noureddine]
Two-channel Audio Amplifier drives stepper motor
- 12/01/06 EDN Design Idea Pulse-width-modulated stereo power Amplifier
saves components. . . [by Phill Leyva and Bill Quach, Maxim Integrated Products, Sunnyvale, CA]
Two-Components Drive Stepper Motor
- 01/19/95 EDN Design Idea The extremely simple circuit in Fig 1 drives a
stepper motor directly from 120V ac, 60 Hz. Usually you need switched-dc voltages to drive a stepper motor. But a
stepper motor will run off ac lines if you introduce a 90° phase shift between the voltages. . . [by Carl
Spearow, Basler Electric,m Highland, IL]
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