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Display Circuits:  #'s - C       D - I       J - N       O - T       U - Z

Last Updated:  12/25/2017 01:50:34 PM

Circuits Designed by Dave Johnson, P.E.

Isolated Power Supply for Digital Panel MetersMany inexpensive digital panel meters, such as the one shown below, are designed to operate from a 9v battery.  However, the nature of the panel meter internal design often requires that the DC supply used to power the device be isolated from the ground. . . Circuit by David A. Johnson P.E.-September, 2008

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

Easily display bit-map images on small-graphic LCDs -  11/19/98 EDN-Design Ideas NOTE :  File contain several designs.  Scroll to find this one.  Combining a high-level language, such as Microsoft Windows, with low-level assembly code or C++ code allows you to display perfect bit-map pictures on your small-graphic LCD screen.  You can use Microsoft Paint or any other bit-map-generating program to define and edit the picture.  __ Circuit Design by Todd Fitzsimmons, Densitron Corp, Santa Fe Springs, CA

EE 491 Senior Project Digital Oscilloscope Cornell University 1999 -  My senior project is to design and build a digital oscilloscope for Professor Land.  This project involves a number of design challenges.  On the analog side, I need a fast, low noise A/D converter.  In addition, the circuit requires a -20V bias from a 5V supply.  In the realm of digital, it involves interfacing two micro-controllers with each other, an LCD display, and an analog to digital converter.  With such a broad range of challenges, I searched for help from my professors and contacts I made on the web.  I was successful in getting __ Designed by Reid Gurnee

Eight-bit Generator & Display for Microcontroller -  Here is a simple but effective arrangement for producing the desired bitstream and display.  It has been successfully used for fault finding.   __ Designed by © electronic for u

Electronic NiCad GLow Plug Driver -  Basically, it's a constant voltage source.  It measures the voltage drop across the plug and adjusts its output to to keep that voltage constant  (regardless of the resistance of the plug or the length of the wires) .     __ Designed by Steve Sacco

Embedded Processor Directly Drives LCD -  01/09/03 EDN-Design Ideas Driving a bare LCD does not necessarily require specialized interface circuitry or peripherals.  This design idea describes an alternative drive scheme, which you can easily implement using the general-purpose outputs of a microcontroller. __ Circuit Design by Daniel Malik, Motorola, Czech Republic

Encoder-Adjustable Display -  This circuit has been developed as a semester work for an Electronics class.  It features a 7-segment display.  The number is set with a quadrature encoder: turning the encoder knob you can adjust the number shown.  Building and understanding it you will test your knowledge about interfacing to an encoder, counting, and driving a display to show the information.   __ Designed by Projects & Ideas from Nutchip.com

Enhanced Sports Scoreboard -  This upgraded version of the Professional Sports Scoreboard now includes 2-digit fouls displays for the home and away teams.__ SiliconChip

ErICsson Cell Phone Display GA628 -  The GA628 display provides a 12 character alphanumeric display , some icons in the second line and power consumption of some 100 uA.  It can easily be connected to the hardware, simply by soldering some wires.  The only disadvantage is , it needs a 3.3 V power supply and something around 5.6V.  However, this code and the MSP430 provides a clock for a simple charge pump, realized with 3 diodes __ Designed by Robert Tyrakowski

Excel offers painless LCD initialization -  09/20/01  EDN-Design Ideas To display a font or a symbol on an LCD, you need to convert the desired character into numerical data.  Creating the data for an entire font set requires specialized tools; even with these tools, the task can be daunting.  Alternati __ Circuit Design by Alberto Bitti, Eptar, Lugo, Italy

Fourth Generation of LCD Backlight Technology -  AN65 Linear Technology This publication, LTC's fourth effort devoted to LCD backlighting in as many years, treatssubject comprehensively.  The text considers lamps, display and layout induced losses, circuitry, efficiency related issues, optimization and measurement techniques.  Twelve appended sections cover lamp types, mechanical design, electrical and photometric measurement, layout, circuitry and related topics.  __ Linear Technology/Analog Devices

Free program Designs & analyzes passive & active filters -  7-Jul-05 EDN-Design Ideas Filter design simplified with Matlab-focused program __ Circuit Design by James Squire, Virginia Military Institute, Lexington, VA; Edited by Brad Thompson and Fran Granville

Frequency source feeds entire lab -  01/23/03 EDN-Design Ideas Plumbing a laboratory with a standard frequency makes a lot of sense if the lab uses multiple frequency counters, spectrum analyzers, and other frequency-dependent test equipment.  Rather than spending time keeping all of the instruments' oscillators in calibration or buying expensive, high-precision oscillators, you can use the circuit in Figure 1 to distribute a single calibrated frequency sou __ Circuit Design by Mitchell Lee, Linear Technology Corp, Milpitas, CA

Fuel Mixture Display for Cars, Pt 1 -  Has digital readout and bargraph displays.  A PIC microcontroller makes it a snack to build.__ SiliconChip

Fuel Mixture Display for Cars, Pt 2 -  All the constuction details and calibration procedures.__ SiliconChip

Gamma Correction Amplifier -  This circuit shows a schematic of a typical circuit which can correct for positive or negative gamma.  This is an upgrade of a classic circuit which uses diodes as the nonlinear elements.  The temperature variation of the diode junction voltages is compensated to the fi rst order by the balanced arrangement.  LT1227s and LT1229s__ Linear Technology/Analog Devices App Note, Mar 25th 2010

General Purpose Display Controller -  This is a general purpose display controller for small microcontrollers.  It will be used for various use because it is easy to change its configuration through using a CPLD.   __ Designed by The Electronic Lives Manufacturing-presented Chan

Giant T-shaped LED matrix display board for financial applications containing 275 8x8 LED Modules -  A giant T-shaped LED matrix display board for financial applications containing 275 8x8 LED modules.  This was a project for my employer, but unfortunately another of those kinds of projects which was never quite finished.  Click the photos below for larger versions __ Designed by Hans Summers

Ginormous 7-Segment LED Panel Meter Display -  Have you ever had the need for a digital display that can be read from across the room? How about across the factory? How about fifty or even a hundred metres away?__ SiliconChip

GPS LCD Display Project -  This is a project that I started back late 2003 when I just starting to learn PIC programming.  I wanted to building something that actually did somthing useful.  This project is based on a PIC16F84.  I actually came up with this idea and then after doing some searching I found that a few people had the same idea.  But, I wanted to build my own that I could call mine, developed by me.  The whole idea is, I have several GPS units with no display __ Designed by Jason KE4NYV from Roanoke, Virginia

GSM Based Messaging using Arduino -  Today, GSM networks are widely-used, whether for making calls or sending SMSes.  But some places need urgent messages like in colleges, railway stations, events, share market and so on, and this...__ Electronics Projects for You

GSM-Based Dot-Matrix Display -  Nowadays, LED message displays are becoming very popular for transmitting information to large groups of people quickly.  These can be used indoors or outdoors, in places such as railway platforms, public...__ Electronics Projects for You

H-Bridge drives DC Motors -  This circuit drives small DC motors up to about 100 watts or 5 amps or 40 volts, whichever comes first.  Using bigger parts could make it more powerful.  Using a real H-bridge IC makes sense for this size of motor, but hobbyists love to do it themselves, and I thought it was about time to show a tested H-bridge motor driver that didn't use exotic parts __ Designed by Bob Blick

HD Video Cable Driver using Economical LT6559 -  Single supply 5V HD Video Cable Driver with two resistors setting common voltage on capacitive coupled input.  Two 270pF takes care of 10MHz filtering.  This circuit depicts one of three channels.  __ Linear Technology/Analog Devices App Note, Jul 2, 2012

High Power Ccfl Backlight Inverter for Desktop LCD Displays -  DN164 Design Notes __ Linear Technology/Analog Devices

High Power Desktop LCD Backlight Controller Supports Wide Dimming Ratios While Maximizing Lamp Lifetime -  DN264 Design Notes__ Linear Technology/Analog Devices

High Speed RGB to YPBPR Converter -  An LT6559 and an LT1395 can also be used to map RGB signals into YPBPR component video.  The LT1395 performs a weighted inverting addition of all three inputs.  The LT1395 output includes an amplification of the R input by –324/1.07k = –0.3.  The amplifi cation of the G input is by –324/549 = –0.59.  Finally, the__ Linear Technology/Analog Devices App Note, Mar 25th 2010

High-side driver has fault protection -  09/05/02 EDN-Design Ideas High-side drivers find common use in driving grounded solenoid coils and other loads.  Short-circuit protection for such drivers is essential for avoiding damage from wiring faults and other causes.  Polymer fuses are generally too slow, and discrete current-limiting circuits are large and cumbersome.  The circuit in Figure 1 uses a small, low-dropout linear regulator as a high-side switch and p __ Circuit Design by Carl Spearow, Tokyo Electron, Gilbert, AZ

I2C LCD Interface -  Schematic Only

IC Forms Differential Line Driver/Receiver -  05/25/95 EDN-Design Ideas you can use the HFA1212 dual video buffer to implement differential line drivers and receivers with a minimum of external components __ Circuit Design by Mark Amarandos, Harris Semiconductor, Costa Mesa, CA

Illuminated Optical Magnifier -  We often face problem while reading the values of ICs and miniature SMD components, detecting cracks or shorts in tracks in a PCB, or reading a finely-graduated vernier scale.  Here is...__ Electronics Projects for You

Illumination Circuitry for Liquid Crystal Displays -  Linear Technology AN49 __ Designed by Jim WilliamsAug 23rd, 1992

Illuminationry for Liquid Crystal Displays -  AN49 Current generation portable computers and instruments utilize backlit liquid crystal displays.  The back light requires a highly efficient, high voltage AC source as well as other supply circuitry.  AN49 details these circuits and also includes sections on efficiency__ Linear Technology/Analog Devices

Improve roll-off of Sallen-Key filter -  09/30/04 EDN-Design Ideas The well-documented Sallen-Key active filter is a staple of analog design.  This design idea shows a way to obtain better roll-off by adding just a few common passive components.  Figure 1a Page includes several designs.  Scroll to find this one __ Circuit Design by Doug Glenn, Teledyne, Lewisburg, TN

Input filter prevents instrumentation-amp RF-rectification errors -  11/13/03  EDN-Design Ideas Instrumentation amplifiers serve in a variety of applications that need to extract a weak differential signal from large common-mode noise or interference.  However, designers often overlook the potential problem of RF rectification __ Circuit Design by Charles Kitchin, Lew Counts, and Moshe Gerstenhaber, Analog Devices, Wilmington, MA

Input Video Selector & ADC Driver for Multimedia Display SystE - M -  Input selection is readily implemented with the LT6556 on 5V, supporting all video resolutions including UXGA by virtue of its 750MHz bandwidth and 6.5ns settling time.  For the AC-coupling shown, the outputs swing approximately ±0.7V about the mid-supply level, within an available range of 2.6VP-P.  __ Linear Technology/Analog Devices App Note, Mar 25th 2010

Interface LCD with ease -  04/27/00 EDN-Design Ideas Alphanumeric LCDs find use in various embedded systems.  In these systems,µCs often lack I/O resources, so you must make optimum use of the available resources.  LCDs have a bus-oriented interfacing structure, which consumes 11 I/O lines  (eight data lines and three control lines) .  You cannot always afford to spare this many I/O lines.   __ Circuit Design by Bharat Mehta, Space Applications Center, Ahmedabad, India

Interfacing 16x2 Character -  LCD to parallel port __ Designed by Craig Peacock

Internet Time Display Module for the WIB -  Looking for a really accurate clock? This simple add-on board for the WIB  (Web Server In A Box) displays the time and date, as gathered from an internet time server.  You can use it as a clock you never need to adjust and it can even be configured in the WIB to automatically adjust for daylight saving time.__ SiliconChip

IRADK10 Motor Drive Reference Design Kit -  The kit has a Graphical User Interface  (GUI) that enables the user to control motor speed and set the basic control parameters such as PWM frequency and shut down conditions via the serial link.  

Isolated Power Supply for Digital Panel Meters -  Many inexpensive digital panel meters, such as the one shown below, are designed to operate from a 9v battery.  However, the nature of the panel meter internal design often requires that the DC supply used to power the device be isolated from the ground. . . Circuit by David A. Johnson P.E.-September, 2008

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Display Circuits:  #'s - C       D - I       J - N       O - T       U - Z

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