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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:

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

Hack of Talking Fish using a PIC16F819 microcontroller -  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

Hacking a Mini Wireless Web Server Pt.1 -  For about $30, you can have a tiny, low-power web/email server with WiFi, Ethernet and USB.  And with a bit of extra circuitry, it can even monitor voltages and control some relays.__ SiliconChip

Hack-Toy Car -  This car measures just 5 1/2 inches in length.  It was sold as a remote control car for $19.95 at Fry's Electronics here in Phoenix.  Powered by 4 AAA batteries, it has a small dc motor and a very interesting steering mechanism.   (08/08/08)  __ Designed by Luhan MonatMesa Arizona

Hand Soldering of MNA Amplifiers -  AN-60031 Application Note__ MiniCircuits.com

Hand-Held Digital Audio Oscillator -  Do you need to test audio equipment, including amplifiers and speakers, in the field and in the workshop? If so, you could use this compact and inexpensive digital audio oscillator.  It can produce sine, square, triangle and sawtooth waveforms in the frequency range from 10Hz-30kHz and features three output ranges: 20mV, 200mV & 1V.__ SiliconChip

Hand-Held Metal Locator -  Ideal for finding steel frames and studs, steel bracing and nails in plaster walls, this Metal Locator can also show the length of the tang in knife handles, screwdrivers and other tools.  As well, it can discriminate between ferrous and non-ferrous metals.__ SiliconChip

Hardware Random Number Generator with an SX microcontroller -  Microcontroller based electronic circuit __ Designed by Frank Crivelli & Peter Crowcroft

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

HC-11 Evaluation Board -  Build a low-cost evaluation board for Motorola 68HC11.  Downloadable BUFFALO V3.4 to 32kB SRAM for learning __ Designed by Wichit Sirichote

Hearing Loop Signal Conditioner -  Want to drive a hearing loop using a conventional voltage  (audio) amplifier? This Hearing Loop Signal Conditioner includes signal compression and has a treble boost control to compensate for high-frequency roll-off due to loop inductance.  It uses low-cost parts and is easy to build.__ SiliconChip

Hexbot Robot -  The HEXBOT is constructed from 12  (cheap) model airplane servos.  Each leg moves laterally on one servo and vertically on the other.  Conveniently, this type of servo runs on 5 volts.  These servos need only a specific width pulse to position it.  Once it arrives at its target location, it draws very little power  (about 10 ma) .  Power is provided)  __ Designed by Luhan MonatMesa Arizona

Hierarchical Priority Encoder -  Anormal priority encoder encodes only the highest-order data line.  But in many situations, not only the highest but the second-highest priority information is also needed.  The circuit presented here encodes both...__ Electronics Projects for You

High Accuracy RPM-Measurement with 68HC12 -  Schematic + code __ Designed by Ludwig Orgler-Fachingenieur Elektrotechnik

High Efficiency Halogen Bike Light Dimmer -  This circuit uses a PIC16F84 microcontroller with some software to control20-Watt12V DC halogen lamp

High Efficiency I/O Power Generation for Mobile Pentium Iii Microprocessors -  DN258 Design Notes__ Linear Technology/Analog Devices

High Efficiency Power Sources for Pentium Tm Processors -  DN90 Design Notes__ Linear Technology/Analog Devices

High Voltage Megohm Tester -  Resistance measurements far beyond where a DMM will go__ SiliconChip

High-accuracy Digital LC Meter -  Here's a handy piece of test gear you can build for yourselfa Digital LC Meter for measuring inductance and capacitance over a wide range.  It's based on an ingenious measurement technique, delivers surprising accuracy and is easy to build.__ SiliconChip

High-Current, High-Voltage Battery Capacity Meter, Pt.2 -  Last month we presented the full description, operation and construction details of our new Battery Capacity Meter.  This month we guide you through the once-only setup and calibration.  We also explain in detail how to use it!__ SiliconChip

High-efficiency power supply for 1W Luxeon Star LEDs -  Easy-to-build design lets you use a pair of 1.5V "D" cells and includes a brightness control to further extend the battery life.__ SiliconChip

High-Energy Electronic Ignition System for Cars, Pt.1 -  This new circuit improves upon our very popular high energy electronic ignition system.  It uses an IGBT ignition driver rather than the expensive high-voltage Darlington used in our previous designs.  You can use it to replace a failed ignition module or to upgrade a mechanical ignition system when restoring a vehicle.__ SiliconChip

High-Energy Electronic Ignition System; Part 2 -  Six Versions To Build To Suit Your Car's Trigger Input!__ SiliconChip

High-Frequency VGA has Digital Control -  07/18/96  EDN-Design Ideas You can use variable-gain amplifiers  (VGAs) in many types of systems, such as radio receivers, in which the input signal voltage depends on an uncontrolled variable, such as distance to the transmitter.  In this type of system, you can use a VGA to ensure that the input signal amplitude matches the input voltage range of key components, such as ADCs and DACs, thereby maximizing the converters' dynamic range. __ Circuit Design by Ron Mancini, Harris Semiconductor, Melbourne, FL

High-Quality Stereo Digital-to-Analog Converter, Part 3 -  The final article this month shows you how to assemble the various modules for the Stereo DAC into a low-profile steel case.  We also tell you how to get the remote control working and how to customise the configuration.__ SiliconChip

High-Quality Stereo Digital-To-Analog Converter, Pt.1 -  Are you listening to CDs via your DVD player? Does your DVD player have average sound quality or worse, cause buzz and hum problems when hooked up to your hifi system? Either way, you need this high-quality Stereo Digital-To-Analog Converter  (DAC) to get first class sound and zero hum.__ SiliconChip

High-Quality Stereo Digital-To-Analog Converter, Pt.2 -  Last month, we introduced our new high-quality Stereo Digital-To-Analog Converter  (DAC) and described the circuit.  This month, we show you how to build the various modules and make the header cables.__ SiliconChip

Home Security -  PIC Project  Creating a modular, networked, home control system was greatly simplified by using common 4-wire phone cable with stake-on connectors.  The cable feeds both power and network signals to the various modules.  Each module is made on a single sided circuit board with RJ-11 connectors  (for the network/power) along with other connectors as needed.  This eliminates the need for placing power feeds  (wall worts) for each of the modules.  The entire system runs on one power feed.   __ Designed by Luhan MonatMesa Arizona

Home Theater -  PIC Project  This unit is designed to interface: TV sound, videotape sound, and 5.1 dvd sound to a 4 channel home theater system.   __ Designed by Luhan MonatMesa Arizona

Homebrewed Stamp -  My Homebrewed stamp.  I ordered it from Peter Anderson, he supplies all the components neccessary to build it, but no pcb board.  I got a friend of mine to make me a pcb board for it, then i just solder everything on.  You can just use a breadboard instead of a pcb board, but the pcb board make a nice job of it.  It is nice because all the IC's are in sockets, so if you want to write to the EEPROM thousand times a day, you can, just replace it when its life it up.  Its a great product, if you want to find more info on the Homebrewed stamp go over to my links section and look for Peter Anderson's website.   __ Designed by Shaun Wilson

Homebuilt RS232 LCD Interface -  This controller board takes anything between +5Volt to +30 Volt power ,  (have it's own regulator) .  

Homebuilt Video Digitizer Mark I -  This frame grabber design digitises pictures to very high quality in monochrome  (8-bit black & white) . Although designed for the European standard 625-line / 50Hz TV system, it should work with the American 525-line / 60Hz standard with minimal modification. __ Designed by W.A. Steer  PhD

Homebuilt Video Digitizer Mark II -  A "video-digitiser"  (also known as a "frame grabber") captures television pictures from a TV set, camera, or video recorder, etc., and forwards them to a computer for display, storage, or general manipulation. This document describes a home-built digitiser which interfaces to an EPP  (or bi-directional) parallel port on IBM PCs. __ Designed by W.A. Steer  PhD

Hookup Increases Ad2101's Memory -  04/27/95 EDN-Design Ideas The circuit in Fig 1 increases the memory of Analog Devices' 2101 family of fixed-point DSP Ps.  The simple scheme uses only three external static-memory devices and no glue logic.  With the additional memory, the DSP P will have 16k words of program memory and 15k words of data memory.   (The memory totals include 2k words of internal program memory and 1k word of internal data memory.)  __ Circuit Design by Bogdan Morariu Digital Dispatch Systems, Richmond, BC, Canada

How a 3499A/B/C System Benefits from Upgrading to the New 34980A Switch/Measure Unit -  Application Note__ Aligent

I Spy with My Little Eye.. -  Peer into hidden nooks and crannies with this tiny ionspection camera built into a flexible wand.__ SiliconChip

I/O System & Chip Verification in PCI & PCI-X Systems -  Application Note__ Aligent

ICL7107-DigitAL LED AM METER -  Ammeter is a great addition to any Laboratory Power Supply as it will measure the current consumption and help you determine if there are any problems with the circuit that you are building or testing.  This amper meter is capable of measuring the current consumption up to 10A with selected 100mA, 10mA and 1mA accuracy.  

ICL7107-DigitAL LED VOLTMETER -  This digital voltmeter is ideal to use for measuring the output voltage of your DC power supply.  It includes a 3.5-digit LED display with a negative voltage indicator.  It measures DC voltages from 0 to 199.9V with a resolution of 0.1V.  

Improving the GPS-Based Frequency Reference -  Did you build the GPS-based Frequency Reference described in the March-May 2007 issues of SILICON CHIP? Its frequency stability can be significantly improved with a couple of circuit changes, as described here.  The modifications also make it easier to lock the oven crystal to the correct frequency.__ SiliconChip


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

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