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Last Updated: December 31, 2017 06:48 AM


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

µP Displays 10 Bit Data on Three LEDs -  11/07/96 EDN-Design Ideas circuit in Figure 1 uses a PIC16C55 µP to read 10-bit binary data and directly display  data in decimal format on three common-cathode LED displays.  If value of  data exceeds 999,  displays show three hyphens  (---) to represent overflow.  PIC16C55 has high drive__ Circuit Design by Yongping Xia, Philips Lighting Electronics, Torrance, CA

1 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 1provIdeas 6V bias for LCDs and a separate, quiet negative bias for a GaAsFET power ampli__ Circuit Design by John Wettroth, Maxim Integrated Products, Apex, NC

1 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). - __ Circuit Design by Benabadji Noureddine

1-Wire 8-bit LCD Reference Design  -  This App Note demonstrates creating a 1-Wire® 8-bit LCD.  The code to drive the DS2408 LCD display is also provided.  The LCD used was the Data Vision Model NO: DV-16252-S1FBLY, however any LCD with this Hitachi 44780 based LCD controller chip can be used.  __ Maxim Integrated

1-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

28 LED Clock -  This is a programmable clock timer circuit that uses individual LEDs to indicate hours and minutes.12 LEDs can be arranged in a circle to represent the 12 hours of a clock face and an additional 12 LEDs can be arranged in an outer circle to indicate 5 minute intervals within the hour.4 additional LEDs are used to indicate 1 to 4 minutes of time within each 5 minute interval.   __ Designed by Bill Bowden

2-Wire LCD Interface using PIC16cf84 -  Alphanumeric LCD displays have become very popular for microcontroller applications because y can add a lot to a project in a variety of different ways.  A text message givinguser instructions as well as feedback can make application seem much more "professional" and easy to use.  I like to use LCD's to help debug applications, with breakpoints set to display variable and I/O conditions and y are a lot cheaper than using a microcontroller emulator.  To top it off, surplus LCD's can be found for a dollar or less __ Designed by Reynold's Elec

5W PLL Stereo Transmitter with LCD -  Here's PLL FM transmitter circuit from china.  This circuit uses the familiar 2SC1971 for final power amplifier stage.   __ Contact: sky @ cantonmade.com and balalove2008 @ hotmail.com

5x7 Display -  Sit back and take a big breath.  You are about to take part in one of the best microcomputer   (microprocessor) projects you have seen.  It uses a PIC16F84 micro and you will be shown how to program the chip to create quite amazing effects.  It's a simple project and you will be starting at the beginning of programming, so don't worry if you have never worked with a microprocessor before __ Designed by Collin Mitchell

7 by 10 LED Moving Sign -  This sign uses two LED arrays to form a 7 X 10 matrix.  It produces moving messages or animations stored in an EPROM.  It uses no microprocessor.   As in most electric signs, the LEDs are matrixed, and strobed very quickly.   __ Designed by Bob Blick

7 Segment LED Counter -  This simple counter can be used to count pulses, as the basis for a customer counter   (like you see at the doors of some stores) , or for anything else that may be counted.  The circuit accepts any TTL compatible logic signal, and can be expanded easily   (see Notes)  __ Designed by Aaron Cake

7 segment rolling display using PC -  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.

72 LED Clock In the circuit above, 60 individual LEDs are used to indicate the minutes of a clock and 12 LEDs indicate hours.  The power supply and time base circuitry is the same as described in the 28 LED clock circuit above.  The minutes section of the clock is comprised of eight 74HCT164 shift registers cascaded so that a single bit can be recirculated through the 60 stages i __ Designed by Bill Bowden

7-Segment Display -  This experiment is more of an introduction to the 4511 decoder/display driver IC than it is a lesson in how to "build up" a digital function from lower-level components.  Since 7-segment displays are very common components of digital devices, it is good to be familiar with the "driving" circuits behind them, and the 4511 is a good example of a typical driver IC   (circuit add 6/07)  __ Designed by © EETech Media, LLC.

7-segment LCD uses two-wire interface -  09/04/03 EDN-Design Ideas You can connect seven-segment LCDs using only a two-wire interface   (Figure 1).  The two-wire interface may be at the field-effect, direct-drive LCD or at a serial interface   (such as I2C) that uses an eight-pin microcontroller.  The design in Figure 1 uses an Atmel   (www.  atmel.  com) ATtiny12 microcontroller, IC1.  VCC can range from 2.7 to 5.5V.  Each digit receives drive from an 8-bit 74HC164 shift register, which provIdeas seven outputs for each of the segments and one output for a decimal point or a colon__ Circuit Design by Hans Krobath

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

9 Second Digital Readout Countdown Timer -  This circuit provides a visual 9 second delay using a 7 segment digital readout LED.  When the switch is closed, the CD4010 up/down counter is preset to 9 and the 555 timer is disabled with the output held high.  When the switch is opened,  __ Designed by Bill Bowden

A Fourth Generation of LCD Backlight Technology -  Linear Technology AN65 __ Designed by Jim WilliamsNov 1st, 1995

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

Active-Matrix LCD Bias Supply Operates from Battery Input -  02/03/00 EDN-Design Ideas Many active-matrix-LCD applications need multiple voltages for thin-film-transistor   (TFT]bias.  Typically, three voltages are necessary5V forcolumn driver; a positive voltage, such as 10V; and a negative voltage, such -5V, for __ Circuit Design by Michael Shrivathson, National Semiconductor Corp, Santa Clara, CA

AIR display -  A Noisemaker without noise.  A simple rotating display.  Just spin and enjoy.  While the "Air display" is rotating, it writes the message on the air.  Because the "persistence of the vision", you will be able to read the message.  Circuit, see JP6293E.  gif.  Download the HEX file, Program the PIC with JP6293E.  hex.  Algorithm, Build your own Air Display using code.  txt __ Designed by Jose Pino

AN49Illumination Circuitry for Liquid Crystal Displays -  Linear Technology AN49 __ Designed by Jim WilliamsAug 23rd, 1992

AN65A Fourth Generation of LCD Backlight Technology -  Linear Technology AN65 __ Designed by Jim WilliamsNov 1st, 1995

AN81Ultracompact LCD Backlight Inverters -  Linear Technology AN81 __ Designed by Jim WilliamsSep 1st, 1999

Animated LED Signboard PIC16C84 -  Schematic only, no circuit description __ Designed by Lewin A.R.W. Edwards

Audio noise generator drives earphones or small speaker  -  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

AVR 2x16 LCD & 4x4 keypad driver -  Connect some 2x16 characters LCD display and 4x4 keypad with AVR microcontroller __ Designed by © Vassilis Serasidis

Big 7-Segment LED Display Board with SPI Interface -  Easy build and use, the general purpose Big LED with SPI serial interfacing.  Expandable for multiple digits but still uses only three wires for receiving data from any uC boards.   __ Designed by Wichit Sirichote

Build your own printer cable LCD Display -  Connecting a LCD display to your personal computer is an easy job.  Displaying data from your PC to a LCD can be proven very exiting, so give it a try and build your own today! In this article we will use a 2 lines x 16 characters LCD display with Hitachi HD44780 onboard controller  __ Contact: IQ Technologies

Call Sign Annunciator -  In the USA, R/C wireless video hobbyists are required to operate their video transmitters under the FCC Part 97 regulations   (amateur radio).  The only exceptions are the Part 15 approved systems, but these low power alternatives are rarely used.  Other countries have similar requirements.  Playing by the rules will certainly prevent conflicts with government officials, since they can levy substantial penalties to offenders.  But more importantly, following the rules is the basis of good amateur radio manners.   __ Designed by RC-CAM T. Black

Character LCD Displays. Part 1 -  LCD character displays can be found in espresso machines, laser printers, children's toys and maybe even the odd toaster.  The Hitachi HD44780 controller has become an industry standard for these types of displays.  This tutorial will __

Character LCD Displays. Part 2 -  This tutorial continues from Character LCD DisplaysPart 1.  In this part we will connect the LCD module to an Atmega8 microcontroller, then write some code to drive it.  The Circuit Our first task is to build the circuit.  Click to __

Circuit for driving a liquid crystal (LCD) shutter to simply pass or block light -  Many of our customers request samples of a simple liquid crystal display shutter that can pass or block light.  Usually this light is in the visible spectrum, however occasionally we hear of applications where IR or UV wavelengths are involved.  If your application is for a shutter that operates outside the visible spectrum, please let us know at the time you request your sample.  __ Liquid Crystal Technologies

Circuit provides 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

Circuit Thermally Compensates LCD Contrast Bias -  03/16/95 EDN-Design Ideas The circuit in Fig 1 provIdeas digital control and automatic thermal compensation for LCD contrast bias.  This control and compensation eliminates the need for panel-mount hardware and frequent manual adjustment of LCD contrast in changing temperature environments.  Major components in Fig 1 include an inverting current-mode PWM regulator,__ Circuit Design by Damian Anzaldo, AVO International-Biddle Instruments, Blue Bell, PA

Circuit Tricks Increase LCD Contrast -  04/24/97 EDN-Design Ideas A popular combination in embedded designs is the Microchip Technology PIC µC mated to one of the many available LCD modules.  These combinations provide a low-cost, simple way to add intelligence to any design.  The LCD modules are specified to operate from one 5V supply, but the lack of a negative voltage to bias the LCD backplane severely limits the available LCD contrast.   __ Circuit Design by Steve Hageman, Hewlett-Packard, Santa Rosa, CA

Clock with Timer & Solar Panel Regulator -  This is a combination digital clock timer and solar panel charge controller used to maintain a deep cycle battery from a solar panel.  The timer output is used to control a 12 volt load for a 32 minute time interval each day.  Start time is set using 9 dip switches and ends 32 minutes later. __ Designed by Bill Bowden

Connect a 2x16 characters LCD display to a 4x4 keypA - D -  Connect some 2x16 characters LCD display and 4x4 keypad with AVR microcontroller___ © Vassilis Serasidis


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