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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 Monat, Mesa, AZ
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. 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 Monat, Mesa, AZ
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 Monat, Mesa, AZ
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 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 µPs. The simple scheme uses only three external static-memory devices and no glue logic. With the additional memory, the DSP µP 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.) Design by Bogdan Morariu Digital Dispatch Systems, Richmond, BC, Canada
I Spy with My Little Eye.. - Peer into hidden nooks and crannies with this tiny ionspection camera built into a flexible wand.__ SiliconChip
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
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