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

Last Updated:  12/31/2017 01:33:41 PM

Circuits Designed by Dave Johnson, P.E.

Power Supply for Digital Panel Meters that is IsolatedMany 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 . . . Hobby Circuit designed by Dave Johnson P.E.-September, 2008

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OLED Driver: 7V AT 350mA,-7V AT 250mA -  The dual boost/inverting LT3471 provides positive  (7V AT 350mA) and negative  (-7V AT 250mA) bias voltages for an OLED display from a single cell Li-Ion__ Linear Technology/Analog Devices App Note, Mar 24th 2010

One Hz-2.5 GHz with Blue 2x16 LCD display -  This is a top quality project designed to obtain maximum performance.  The hardware and software has been pushed to reach the frontier of technology.  The transcendent is not only a frequency counter, it is a corner stone in your successfully constructions.  

One IC Biases LCD & GaAsFET Amplifier -  04/09/98 EDN-Design Ideas -  (File ,contains several circuits, scroll to this one) Operating from a lithium-ion cell or a four-cell NiCd battery, the circuit in Figure 1  provIdeas 6V bias for LCDs and a separate, quiet negative bias for a GaAsFET power amplifier.  This bias combination exists in cell phones __ Circuit Design by John Wettroth, Maxim Integrated Products, Apex, NC

One wire brings power & data to LCD Module -  01/27/14EDN-Design Ideas If you need to connect a small remote LCD display, or your µC has run out of I/O pins, here’s a good, cheap solutionEmbedded systems frequently use HD44780type LCD displays as it is considered the most popular alphanumeric display controller.  The interface comprises at least 14 pins: eight for data, three for control    (EN, WR, RS) , two for power supply    (Vdd, Vss) , and one for contrast    (Vre) .  Configured in 8bit mode, it requires at least 10 I/O lines    (D0D7, EN, RS) .  Configured in 4bit mode, it requires at least six I/O lines    (D4D7, EN, RS)  __ Circuit Design by Benabadji Noureddine

One wire controls LCD Module -  EDN-Design Ideas 03/20/2017    This one-wire LCD interface DI generates all the signals required to control the ubiquitous character display __ Circuit Design by Rex Niven

Pardy Lights: an Intriguing Colour Display -  OK, so they're really "party" lights.  They're easy to build and produce random colour patterns to the bass beat from your music.__ SiliconChip

PC based 7 segment rolling display -  It is very interesting and convenient to be able to control everything while sitting at your PC terminal.  Here, a simple hardware circuit and software is used to interface a 7-segment based rolling display.  The printer port of a PC provides a set of points with some acting as input lines and some others as output lines.  Some lines are open collector type which can be used as input lines.  The circuit given here can be used for interfacing with any type of PC’s printer port

PC-Driven LED Display -  Here is a circuit to generate sequentially running light effects using a simple program written in C.  The output of the program is taken from the LPT port of a PC...__ Electronics Projects for You

Peggy-A Light Emitting Pegboard Display -  With all the cool things that you can do with LEDs today, there is still one thing that’s lacking: simplicity.  If you want to run a bunch of LEDs at a time, you usually end up spending a fair bit of time worrying about series and parallel combinations, matching brightness, and picking load resistors.  Or, if you’re a beginner, maybe you only get one third of the way through the previous sentence– wondering if you’re already in over your head. __ Designed by © Evil Mad Scientist

PIC 5x7 Display -  The PIC board detects 3rd harmonic distortion of AC power line.   __ Designed by Prepared Colin Mitchell

Picxie 2 8x8 Animated LED Signboard -  The firmware supplied incurrent sourcecode archive is VERY BASIC.  I do intend to draw more patterns.  However, a vast workload coupled with possible emigration has putfinished firmware on hold.  Please do go ahead and build this circuit thoughsupplied firmware is fully functional.  You can have hours of fun designing your own patterns and effects!UsesPIC16F84 __ Designed by Lewin A.R.W. Edwards

Pocket Ignignokt LED display -  By now everyone's heard about the 2007 Boston Mooninite Scare.  Unfortunately, as far as I know, no one has put any thought into mass producing more of these guys.  Well, no more.  Thom, a now-buddy of mine from Chicago, emailed me after he saw my Superbowl party window decoration to tell me that he thought it would be awesome to design a Mooninite PCB that could be built cheaply enough to be used as a throwie.  So here it is.   __ Designed by © 2007 Riad S. Wahby

PointLess LED Array-A 8 by 8 array displays something using POV -  We have 64 LEDs and a lot fewer output pins, but wait, the LEDs are already wired in a row and column setup  (all LEDs in one row wired to a common pin, all LEDs in one column wired to a common pin) We can turn on one row, the set a byte to the column and turn on 0 to 8 LEDs in that column.  Time multiplex through the rows and we can display any of 0 to 64 of the 64 LEDs.  Do it fast and no one notices the blinking.

Pot Adjusts LCD's Contrast -  02/04/99 EDN-Design Ideas NOTE : Page includes several designs.  Scroll to find this one.  You can use a digitally controlled potentiometer for many purposes.  In this example, you can use the device to regulate the contrast of a standard (such as two lines by 40 characters] LCD.  You can use the circuit in Figure 1 in a portable test system, in which you need to change the contrast of the LCD as a function of the viewing angle.  You choose the contrast setup __ Circuit Design by Jef Collin, CSE Systems, Turnhout, Belgium

Potentiometer Controls LCD Bias -  03/17/94 EDN-Design Ideas Designers of pen-based computers can easily relegate some controls that were previously mechanical, such as switches and potentiometers, to on-screen icons.  For example, the circuit in Fig 1 shows one way that digital logic can control the -24V-dc LCD bias using two general-purpose I/O command lines.  The DS-1669 from Dallas Semiconductor __ Circuit Design by Michael Cortopassi, Dauphin Technology, Lombard, IL

Potentiometers Enable Programmable Biquadratic Filter -  07/22/04 EDN-Design Ideas Of the many types of analog filters available to designers, few allow easy adjustments of the filter parameters.  The biquadratic, or biquad, filter is an exception, however.  You can change that filter's corner frequency (ω0], Q, and gain (H] by adjusting the values of three resistors.  For that purpose, the lowpass biquad circuit of Figure 1 includes three digital potentiometers configure __ Circuit Design by Deborah Mancuso and Donald Schelle, Maxim Integrated Products, Sunnyvale, CA

Power Supply for Digital Panel Meters that is Isolated -  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 . . . Hobby Circuit designed by Dave Johnson P.E.-September, 2008

Power-supply IC drives multiple LEDs -  09/02/04  EDN-Design Ideas Bright LEDs are becoming prominent sources of light.  They often have better efficiency and reliability than do conventional light sources.  Although LEDs can operate from an energy source as simple as a battery and a resistor, drivin __ Circuit Design by John Lo Giudice and Vee Shing Wong, STMicroelectronics, Schaumburg, IL

Precision Wideband Current Probe for LCD Backlight Measurement -  DN101 Design Notes__ Linear Technology/Analog Devices

Processor's PWM output controls LCD/LED driver -  27-May-04 EDN-Design Ideas The PWM (pulse-width-modulation] output available from many microprocessors is based on an internal 8- or 16-bit counter and features a programmable duty cycle.  It is suitable for adjusting the output of an LCD driver (Figure 1) , a negative-voltage LCD driver (Figure 2], or a current-controlled LED driver (Figure 3] __ Circuit Design by Joe Neubauer, Maxim Integrated Products, Sunnyvale, CA

Programable LCD counter with memory backup -  This counter based on AT90S1200A its  programmable and when shut it down its keeping  the  current counts to the memory, until to the  power on. __ Designed by © Vassilis Serasidis

Programming Fun Lights with TI's TCA6507 -  App Note , 30-Nov-07 __ Designed by Texas Instruments

Projection Clock  -  I'm pretty nearsighted and also an intermittent sleeper, and it has always frustrated me to contort myself far enough to read my clock radio display without my glasses on.   __ Designed by Markus Wandel

Provide Effective LCD Drive -  09/28/00 EDN-Design Ideas LCDs find wide use in portable instruments, thanks to their attractive display and low power consumption.  The circuit in Figure 1 is an effective driver for LCDs.  The circuit comprises two main sections—the ICM7211 drivers  (IC2  __ Circuit Design by Luo Ben Cheng, Chinese Academy of Science, Beijing, China

Provide High-Side Current-Sensing for White-LED Drivers -  02/19/04  EDN-Design Ideas White LEDs find wide use in backlighting color-LCD screens in most portable devices, such as cellular phones, PDAs, and MP3 players.  Multiple LEDs often connect in series to ensure that the same current flows through every LED.  To  __ Circuit Design by Dimitry Goder, Sipex Corp, San Jose, CA

Put Your Own Smiley On GLCD -  The regular 16×2 LCD can display characters of only certain dimensions.  A graphical LCD  (GLCD) , on the other hand, can display custom graphics.  GLCDs are therefore highly suitable for mobile and...__ Electronics Projects for You

Quad Output Switching Converter Provides Power for Large TFT LCD Panels -  DN349 Design Notes __ Linear Technology/Analog Devices

Quad Output Switching Converter Provides Power for Large TFT LCD Panels -  DN349 Design Notes __ Linear Technology/Analog Devices

Quad Output TFT-LCD Power Supply: 12.2V AT 500mA, 3.3V AT 2A, 35V AT 30mA,-5.5V AT 50mA -  The LT1943 integrates 4 high efficiency switching regulators to provide 4 high power outputs for biasing TFT-LCD displays: 12.2V AT 500mA, 3.3 V AT 2A, 35V AT 30mA, -5.5V AT 50mA__ Linear Technology/Analog Devices App Note, Mar 24th 2010

Read isolated digital signals without power drain -  25-Nov-04 EDN-Design Ideas Although optocouplers offer designers a straightforward method of establishing galvanic isolation between circuits that operate at different ground potentials, they do not provide an ideal approach.  An optocoupler draws power from the isolated circuit, switches relatively slowly, and loses current-transfer ratio as its light emitter ages __ Circuit Design by Alfredo H Saab and Joseph Neubauer, Maxim Integrated Products Inc, Sunnyvale, CA

Remote Controlled Sign -  Nowadays, remote controls are cheap enough to allow addition to any kind of electronic device, included simple ones.  In order to have a remote controlled,  __ Designed by Projects & Ideas from Nutchip.com

Remote display -  On this page, I will introduce remote display with PIC16F873.  The asynchronous communication function  (USART) of PIC16F873 is used for this equipment.  The information which is set with the control unit is displayed on the large-sized display installed in the about 10-m left place using the cable.  The size of the displaying unit has 25-cm height, 40-cm width.  It is not so large size __ Designed by Seiichi Inoue

RGB to YPBPR Component-Video Conversion -  Figure 15 shows a method of generating the standard definition YPBPR signals from an RGB source using a pair of LT6550 triple amplifiers.  It should be noted that to ensure Y includes a correct sync, correct syncs should be present at all three inputs or else added directly at the Y output gated 8.5mA current sink or 350Ω__ Linear Technology/Analog Devices App Note, Mar 25th 2010

RGB Video Inverter -  This circuit is useful for viewing photographic negatives on video.  A single channel can be used for composite or monochrome video.  The inverting amplifier stages are only switched in during active video so the blanking, sync and color burst  (if present) are not disturbed.  To prevent video from swinging negative, a voltage__ Linear Technology/Analog Devices App Note, Mar 25th 2010

Rolled-Off Noise Source -  This is a circuit that generates white noise, rolled-off to drive earphones or a small speaker.  White noise creates is a "rushing" sound, which sounds something like air rushing by your ear    (s) .  White noise would be flat with frequency, and since this circuit rolls off within the audio range, I refer to it as "rolled-off" noise.  White    (or rolled-off) noise __ Designed by Dick Cappels

RS232c Line Driver IC Drives Power MOSFETs -  10/24/96 EDN-Design Ideas Easy to effect an interface between power MOSFETs and TTL circuits.    __ Circuit Design by Santosh Shetty, NCRA, Pune University, Pune, India

Running Message Display -  Light emitting diodes are advantageous due to their smaller size, low current consumption and catchy colours they emit.  Here is a running message display circuit wherein the letters formed by LED...__ Electronics Projects for You


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

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