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Digital  / Logic Circuits 
Digital Circuits:   #'s - C       D - G       H - M       N - R       S - T       U - Z

Last Updated on: Monday, December 25, 2017 01:50 PM

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

Tables Ease Microcontroller Programming -  22-April-10 EDN-Design Ideas When creating microcontroller firmware, you often need to work with data arrays.  Tables make easy work of data arrays, such as those for digital-code transformation, correction for sensor linearity, sophisticated calculations, and multiple output organization.  Table 1 shows how you can organize data in a table.   __ Circuit Design by Abel Raynus, Armatron International, Malden, MA

Tachometer(digital) Avoids Analog Vices -  11/10/94 EDN-Design Ideas The digital tachometer in Fig 1a is a component of the digital seek servo loop in Fig 1b.  The loop produces an error signal that causes a motor to follow a sophisticated velocity profile  (Fig 2].  Although you could use an analog t __ Circuit Design by Tan Van Nguyen, IBM SSD Division, San Jose, CA

Tack a log taper onto a digital potentiometer -  01/20/00 EDN-Design Ideas It's sometimes convenient to have digital control of the volume level in an audio system.  The use of multiplying DACs (MDACs) is problematic because of the switching noise of the ladder network.  This noise comes from the bit switches injecting charge into the signal when they turn on and off.  Audio __ Circuit Design by Hank Zumbahlen, Analog Devices, Campbell, CA

Talking Fish Hack -  These items were sold nationally several years ago.  The fish would sing, open its mouth, turn its head, and flap its tail.  After removing the back panel, all of the existing electronics were removed leaving only the 3 servo motors, speaker and photocell)  __ Designed by Luhan MonatMesa Arizona

Talking Frog Box -  This device 'listens' to a conversations and then interjects words and phrases at inappropriate times.   __ Designed by Luhan Monat-Mesa Arizona

Talking Phone Dial Monitor -  Speaks the numbers that you dial as you dial your telephone.5 pages.  Not available as a kit of parts.  __ Golab.com

Tank Water Level Indicator -  A little over five years ago, before water became a "cause celebre", we published a design for a simple tank water level indicator.  Now, with thousands of home water tanks being installed every year  (and prompted by many requests for such a project) , we thought it time to resurrect the idea, albeit with a couple of tweaks.__ SiliconChip

Tele-Call Interceptor -  PIC Project  This device connects between the phone line, an answering machine, and your phones.  When a phone call comes in, the answering machine picks up the call and informs the caller to enter the access code to ring the phone or to wait for the beep and leave a message.  If the correct code is entered, the answering machine is immediately disconnected while the device generates phone ringing tones on an external speaker.  Picking up any phone causes the device to return to its initial state.   __ Designed by Luhan Monat-Mesa Arizona

Telephone call screener with voice -  PIC Project  This unit is an upgrade of the previous phone call interceptor.  Instead of using an answering machine to provide the outgoing message and recording functions, it uses the ISD4004  (from Windbond Electronics) .  The ISD4004 records up to 8 minutes of audio.  I use the first several seconds for outgoing message prompts.  The remaining time is used to record up to 30 messages, depending on message length.   __ Designed by Luhan Monat-Mesa Arizona

Telephone Dialler for Burglar Alarms -  Esy-to-build circuit dials a pre-programmed number via a modem and sends a warning tone if your alarm is triggered__ SiliconChip

Temperature Programmer Uses Digital Control -  07/18/96 EDN-Design Ideas The circuit in Fig.1 is useful for precise, repetitive temperature control of small-volume objects.  It offers high resolution and effective isolation between the control lines and the power mains.  It generates no RFI, has adequate speed, and provIdeas a linear relationship between the digital-input code and the average thermal power supplied by the heater.  The circuit works by generating a programmable number of triggering pulses to a TRIAC connected in series with the heater __ Circuit Design by Jordan Dimitrov, N Poushkarov Institute of Soil Science and Agroecology, Sofia, Bulgaria

Temperature Recorder. Part 1 -  This project uses a Microchip PIC microcontroller, a serial EEPROM and a thermistor to create a temperature recorder.  Performance The temperature is measured and stored at user programmable intervals; this can be from 1 __ Designed by Andrew M. Bishop

Temperature Recorder. Part 2 -  Software PIC Software The PIC software is written in assembler and based on earlier projects using I 2 C interfaces.  The EEPROM, PIC and external connector all share the same I 2 C bus and the PIC will not use it unless the thermistor is fitted.  

Tempmaster Electronic Thermostat Mk.2 -  Want to convert an old chest-type freezer into an energy-efficient fridge? Or convert a spare standard fridge into an excellent wine cooler? These are just two of the jobs this low-cost and easy-to-build electronic thermostat has been designed to do.  It can also be used to control 12V fridges or freezers, as well as heaters in hatcheries and fish tanks.  It controls the fridge/freezer or heater directly via their power cables, so there's no need to modify their internal wiring.__ SiliconChip

Ten Tricks for Interfacing to the PIC16c508 -  Most of the ideas in this chapter can be found on the pages of this website, but just in case you want to go over the capabilities of the '508A, we have brought them together.   Quite often when you are programming, the first thing you will run out of is output lines.  Many projects need lots of drive lines and if you need more than about 8, you should go to another micro-controller.   Don't expect an 8-pin chip to perform the impossible.   __ Contact: Colin Mitchell

Test the Salt Content Of Your Swimming Pool -  Do you have a swimming pool with a salt-water chlorinator? Then you will know that you have to periodically add salt to the water to make sure that the chlorination process works properly.  So how do you measure salt content in your swimming pool?__ SiliconChip

Test Your Reaction Times with a Digital Reaction Timer. -  Everyone takes a finite time to respond to any stimulus, whether it's the brake lamp from the vehicle in front at 110km/h on the freeway, touching a hot saucepan on the stove or whatever.__ SiliconChip

Tester Cycles System-Power Supplies -  10-Jul-08 EDN-Design Ideas A simple two-relay circuit cycles system power on and off to test a design on the benchtop __ Circuit Design by Goh Ban Hok, Infineon Technologies Asia Pacific Ltd, Singapore

The "Matchless" Metal Locator  -  It's cheap, its easy to build and it could find a fortune.__ SiliconChip

The "Mighty Midget" Audio Amplifier Module  -  It's based on a Philips class-H audio amplififer IC and can deliver 36W RMS OR 70W music power, all from a 13.8V supply.__ SiliconChip

The "Sooper Snooper" -  Listen in on conversations, bird calls, noisy engine bearings or even the sound of termites munching into your home.__ SiliconChip

The A-1 Robot -  This Robot is created using a Radio Shack project box.  I have used many of the circuts from DiscoverCircuts.  com with my ideas for AI-A-1.  

The Agilent 34980A a Low Cost Alternative to VXI & PXI -  Application Note__ Aligent

The Basslink High-Voltage DC Power Link -  Back in February 2000 a tender was granted for building a high voltage DC power link between Victoria and Tasmania.  It was finally commissioned in April 2006 and now feeds power in both directions between Victoria and Tasmania, depending on demand in those states.__ SiliconChip

The Battery Guardian -  Don't get caught with a flat battery; this easy-to-build circuit can cut off the power to a 12V fridge or car stereo system if the battery voltages drops below critical level.__ SiliconChip

The Big Blast Subwoofer -  Easy-To-Build unit offers thunderous bass, can handle up to 250W RMS and is built into a compact enclosure.__ SiliconChip

The Dashboard Digital Voltmeter Project -  This project is heLPFul to anyone who drives an automobile.  I had found this project at the local libary.  in an old publication.  I made it and it worked fine.  Below are the complete text and schematic of the Dashboard Digital Voltmeter.  I re-typed the text and re-drew the schematic.  as the printing from the book was old and faded.  Sit back and read the story why this LED display might just save you from being stranded on the road! __ Designed by braincambre500 @ yahoo.com

The Driveway Sentry -  Detect vechicles coming down yur driveway and automatically open gates or sound alarm with this reliable unit.  It works justlike the detectors used for traffic- lights.__ SiliconChip

The Driveway Sentry Mk.2 -  Here's an improved version of the Driveway Sentry we described in the November 2004 issue of SILICON CHIP.  It detects vehicles like cars, trucks, tractors or other farm machinery moving along a driveway or through a gateway.  When movement is detected, it switches on a mains-powered or battery-powered lighting system and activates an optional piezo buzzer alarm for a preset period ranging from 2-25 seconds.__ SiliconChip

The experimenterís pot-Digital Potentiometer The experimenter's pot is a solid state potentiometer using Dallas semiconductorís DS1869 and Nationalís LM78L05 two electrolytic capacitor two small push button switch and two optional Molex connector.  this project is very useful especially in finding the right value of resistor in your experiments __ Contact: IQ Technologies

The HC11 Controls the Stepper -  Simple circuit with 16-pin Nitron chip 68HC908, easy analog setting, source code with ICC08.  New s-record for 8-pin 68HC908QT2! __ Designed by Ludwig Orgler-Fachingenieur Elektrotechnik

The HeartMate Heart Monitor -  Build it and keep tabs on your ticker.  It's just a shot for monitoring your heart rate during exercise, so you dont overdo it.__ SiliconChip

The iButton-Hard "Nut to Crack" -  This family of devices comes in 16mm-diameter stainless ateel cans.  You can build a simple project and read their serial numbers__ SiliconChip

The Itsy-Bitsy USB Lamp -  It plugs into the USB port and is just the shot for checking motherboard switch and jumper settings.__ SiliconChip

The Little Dynamite Subwoofer -  Build this compact subwoofer for very little money.  Its ideal for use in a car or home unit.__ SiliconChip

The Maximite Computer, Pt.2 -  Build A Digital Spirit Level__ SiliconChip

The Maximite Computer, Pt.3 -  Over the past two months we introduced the Maximite, a tiny microcomputer that can turn its hand to many things, from teaching programming to controlling your greenhouse.  In this final article we provide an introduction to the BASIC language running on the Maximite and show you how to use this tiny marvel for measurement and control.__ SiliconChip

The Micromitter Stereo FM Transmitter -  At last!- a stereo FM transmitter that's a snack to align.__ SiliconChip

The MiniMaximite Computer -  We now add to the Maximite family with the miniMaximite; a small, low-cost version designed for use as an intelligent controller to plug into your creation.  It is fully software compatible with the original Maximite so you can develop and test your program on the larger version, then transfer it to the miniMaximite when you are ready to screw the covers down.__ SiliconChip

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Digital or Logic Circuits:  #'s - C       D - G       H - M       N - R       S - T       U - Z

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