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“Chipiplexing”
efficiently drives multiple LEDs using few microcontroller ports -
27-Nov-08 Issue of EDN "Chipiplexing" approach simultaneously drives
two LEDs..... [Design Idea by Guillermo Jaquenod, La Plata, Argentina] |
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1.5V battery powers white LED driver - 30-Sep-04 Issue of EDN
Although white LEDs are common in a variety of lighting applications,
their 3 to 4V forward-voltage drop makes.... [Design Idea by Steve
Caldwell, Maxim Integrated Products, Chandler, AZ] |
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12 DB Amplifier & High Current Line Driver with DC Servo - AS024
Jenson Transformer Application Note (app note 11/02) |
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12 Volt DC Fluorescent Lamp Driver (Aaron Cake) - This
fluorescent lamp driver uses a normal 120 to 6V step-down transformer in
reverse to step12V to about350-Volt to drive a lamp without need to
warm filaments. (added 04/03/02) |
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12 Volt fluorescent lamp drivers - Three schematics of 12 V
drivers for 2, 8 and 20 Watt, plus a lot of explanations about fluorescent
tubes. Use the drivers for camping, emergency, boating, etc. [Manfred
Mornhinweg] |
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128x64 LCD assembly Driver for AT90S2314 - Here you will find a source code
to drive a graphics LCD display 128x64 pixels with AT90S2313.The connections
between LCD and AVR, you will find them to the source code.….(electronic circuit
added 4/05) |
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16x16 LED Matrix & Driver - (circuit / schematic design added 6/06)
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20 dB Amplifier & High Current Balanced Line Driver - AS023 Jenson
Transformer Application Note (app note 7/02) |
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300v Peak To Peak Signal Generator - This circuit converts a square wave
signal to a +-150 volt output signal with fast 100nS rise and fall times.....
[Designed by David A. Johnson] |
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30hz to 90hz Adj P.A. Driver - (circuit / schematic design added 6/06)
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3V BATTERY POWERED WHITE LED DRIVER
- The circuit
below will drive any LED color, including white LEDs, using a DC power supply ranging
from 2v to 3.3v. White and blue LEDs normally require over 3v, so the circuit below
uses a charge pump scheme to deliver a constant LED light intensity from a voltage
less than 3v. The LED is rapidly pulsed with 3ma peak current, which remains fairly
constant, even as the battery voltage changes. The circuit is designed only for low
LED current applications. A common CR2032 lithium coin battery should run the light
for two days. A pair of 2.5 amp-hour AA NiMH cells should operate the circuit for
nearly a month.....[Designed by Dave Johnson, P.E.] |
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3-Ph BLDC Drive Control with Hall Sensors - This reference design describes
a 3-phase 4-quadrant sensor BLDC motor drive, which can run in both a speed open loop
and a speed closed loop. application is designed for MC68HC908MRxx family
dedicated to motor control applications. This reference design includes a
description of Motorola 68HC908MR32 features, basic motor ory, system design
concept, hardware implementation, and(app note added 6/06) |
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3x3x3 LED Cube - This circuit drives a 3x3x3 cube consisting of 27 white
LEDs. The 4020 IC is a 14 stage binary counter and we have used 9 outputs. Each output
drives 3 white LEDs in series and we have omitted a dropper resistor as the chip can
only deliver a maximum of 15mA per output. The 4020 produces 512 different patterns
before the sequence repeats and you have to build the project to see the effects it
produces on the 3D cube. |
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4 Channel Timer using Atmel 89C4051 & MAX7219 display Driver - using Atmel
89C4051 and MAX7219 display Driver (circuit / schematic design added 7/06)
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50 Ohm Long Line Driver - AS029 Jenson Transformer Application Note
(app note 6/07) |
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50 Ohm Long Line Receiver & Driver - AS028 Jenson Transformer Application
Note (app note 6/07) |
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555 timer drives multiple LEDs from one NiMH cell - 2-Oct-08 Issue of EDN
Using a CMOS 555 timer, you can drive seven high-brightness LEDs from a single 1.25V
cell..... [Design Idea by Chuck Irwin, Hendersonville, NC] |
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555 timer eliminates LED driver’s need for microprocessor control - 3-Sep-09
Issue of EDN A timer provides programming pulses for lower cost than a
microprocessor..... [Design Idea by Michael Day, Texas Instruments, Dallas, TX] |
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555 Timer-Based Flyback Transformer Driver - My 24kV high voltage "Jacob's
Ladder" from DIY flyback transformer driver using 555 timer….(electronic circuit added
02/09) |
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556 Switch Machine Driver - The circuits on this page are switch machine
drivers that can be used to operate Stall-Motor type switch machine motors. The
circuits use LM556 dual timer chips to provide a PUSH-PULL output to reverse the
polarity of the supply to the switch machine motors. [from Rob Paisley's Model Train
web site] |
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556 Timer Stall-Motor Switch Machine Drivers - The circuits on this page are
switch machine drivers that can be used to operate Stall-Motor type switch machine
motors. The circuits use LM556 dual timer chips to provide a PUSH-PULL output to
reverse the polarity of the supply to the switch machine motors. [from Rob Paisley's
Model Train web site] |
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5x5x5 LED cube - This month's featured Gadget Freak is provided by an old
favourite of the blog, Peter Griffiths. He shares all the details necessary to build
your own 5 x 5 LED cube… |
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6 Aspect-Searchlight Signal Driver (LM555) - The circuit on this page is a 6
Aspect driver for a bicolour LED type Searchlight Signal. The available signal
indications are; SOLID RED, YELLOW, GREEN, and FLASHING RED, YELLOW and GREEN. The
circuit can also turn the signal OFF for approach lighting if desired. [from Rob
Paisley's Model Train web site] |
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74*245-based Motor driver - A simple, time-honored approach is to use one or
more 74*245 chips (normally 74AC245 is used for maximum current capability) to
provide motor drive current. Here, each channel of drive power is provided by one or
more buffer on chip. (added 6/06) |
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