Heliax 6 Meter Filter construction article - A comprehensive filter construction article using 1-5/8 inch hardline __ Designed by Robert W. Meister WA1MIK
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 Arizona
HF AC Millivoltmeter adapter - intended for use past 200 kHz, this adapter changes HF AC voltages between 2 mv P-P and 200 mv P-P to the corresponding DC level with linearity of better than 1 millivolt. A on-board calibration signal aids in calibration prior to use. __ Designed by Dick Cappels
HF/VHF/UHF Test Oscillator - This test oscillator covers 16 MHz to 300 MHz in six bands, using varactor tuning. it has a high level output to drive a frequency meter and two sine wave outputs, one of which is 50 Ohms.
This article was published in Croatian in infoelektronika magazine in June, 2012 (cooperatively) __ Designed by Dick Cappels
High-Impedance Audio Buffer with JFET - The buffer circuit described here can be used to enhance the AC input impedance of audio amplifiers that are used with pickups in musical instruments. Some signal sources for preamplifiers, passive pickups...__ Electronics Projects for You
High-Voltage Capacitors, build your own! - As one who supplies parts to those who experiment with high voltage, I get a lot of letters and phone calls from frustrated builders that go like: "Can you supply an inexpensive xxx microfarad capacitor at a working voltage of YYY? My only source wants $249 for one. "Sometimes, a high price is justified; other times, a seller has the only capacitors of a special value available, and will soak you for the maximum dollar __ Designed by Tony van Roon VA3AVR
Home Automation System - in this era of digital revolution, we are surrounded by smart devices that are capable of making decisions on their own without much human intervention. Our home can also be made...__ Electronics Projects for You
Home Built Laser Projector - Laser projector is one of the laser display equipments. This project builds the closed-loop galvos mainly and aiming at professional grade. __ Designed by The Electronic Lives Manufacturing-presented Chan
Home built plasma globe. mmmplasma - i'll start off with the plasma globe driver. it is a single transistor driven flyback transformer. You can find all the information on the construction of such a driver on the FLYBACK page linked through my homepage. This particular flyback transformer came from an old mac monitor (parts are probably the best use for mac stuff) that I found outside the chemistry building at the University of iowa. The monitor was pretty old. Old enough that the potted rectifier stuck __ Designed by Greg Miller
Home Control Computer - i used to have this dream of a "computerized home" where a benevolent computer, on a piece of plywood on the wall in the basement somewhere, would oversee the lights and heating, turn on radio or TV when interesting shows come on, make voice announcements of important reminders and so on. I would be able to control this wondrous machine with a remote control from anywhere in the house, or call it up on the telephone, or push buttons on a locally wired keypad or whatever __ Designed by Markus Wandel
Home Evacuated Vacuum Tube - i have always wondered if a vacuum tube could operate with a degree of vacuum attainable by amateur means. This is how I broke open a vacuum tube triode and operated it after pumping it down with a vacuum pump. __ Designed by Nyle Steiner K7NS
Home Made PBX/PABX - i've been facsinated with telecommunications from an early age. When I was twelve or so I had an intercom system from which I could talk to most of the house from my corner of the kids' room. it was made out of the amplifier from a record player, and miscellaneous parts from old TV sets. When I was fourteen someone gave me a WW2 vintage shortwave receiver with a blown power supply. __ Designed by Markus Wandel
Home made portable battery charger - Using a car alternator and a small petrol motor, you can build a very handy portable charger__
Home Made Vacuum Diode - The next step - an actual homemade vacuum tube diode. __ Designed by Nyle Steiner K7NS
Home Made Vacuum Triode - The next step - first attempt at making an actual homemade vacuum tube triode. __ Designed by Nyle Steiner K7NS
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 Arizona
Home Security Project - The security system application and program offers a simple demonstration of the BASIC Serial interface. By adding only a few door and window switches, a transistor, a siren, (see schematic) and a few lines of BASIC program (see program listing) the interface can become a multi-function security system. Please note, however, that it is a "barebones" program. it is left to the reader to fancy it up to their liking. __ KD5ZUG
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 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 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
Homemade Binaural MICs - i used the plans from http://www. Arches.uga.edu/~tidmarsh/binmic.html. i'm no electronics expert but can solder, and it was very easy. if you want to build a battery box you'll probably want some fine gauge wire and a little piece of circuit board in addition to the components listed. __ Designed by Doug Brown
Homemade Copper Oxide Thermoelectric Generator - Homemade Copper Oxide Thermoelectric Generator Can Light An LED. __ Designed by Nyle Steiner K7NS
Homemade Easter Egg Anemometer - in any wind generator installation, it's critical to be able to measure wind speed. That gives you a baseline against which to measure your machine's performance, and anemometers respond much more quickly to changes in wind speed than do wind generators. Commercial anemometers __ Contact OtherPower.com
Homemade Magnetic Audio Amplifier - Circuit + Notes __ Designed by Nyle Steiner K7NS
Homemade Memristor - Circuit + Notes __ Designed by Nyle Steiner K7NS
Homemade Printed Board - Making a custom printed circuit board (PCB) takes some setup time and supplies, but is well worth the repeatable, reliable results. The example board is single-sided copper with through-hole components. Two-sided and surface-mount circuit boards follow. __ Contact David Cook
Homemade Thermistor & Pressure Sensor - it is easy to make a thermistor, thermoelectric generator or pressure sensor by heating a piece of copper wire. __ Designed by Nyle Steiner K7NS
Homemade Tunnel Diode & RF Oscillator - it is incredibly easy to make a homemade device that behaves similar to a tunnel diode. Using it, a simple rf oscillator was made which could be coaxed into running at 12 mhz. __ Designed by Nyle Steiner K7NS
Homemade wide range variable electrolytic capacitor & oscillator - A simple homemade wide range variable electrolytic capacitor using baking soda can vary in capacitance in one continuous sweep over a 5000 to 1 range. This capacitor can vary the frequency of a simple relaxation oscillator over a similar range. Even the zinc negative resistance oscillator can be continuously swept over the entire audio range. __ Designed by Nyle Steiner K7NS
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