Wideband VHF/UHF/SHF 22dB RF preamp with MAR-6 or MAR-8 (MSA-0885) - The MAR6 (MSA-0686, 0685, 0885) is a high performance silicon bipolar Monolithic Microwave integrated Circuit (MMIC ) housed in a low cost, surface mount plastic package.
This MMIC is designed for use as a general purpose 50 W gain block. Applications include narrow and broad band iF and RF amplifiers in commercial and industrial applications. __ Designed by Guy Roels ON6MUWIFI CAN Antenna - Got no dough for a commercial WiFi antenna? Looking for an inexpensive way to increase the range of your wireless network? A tin can waveguide antenna, or Cantenna, may be just the ticket. This design can be built for under $5 U. S. and reuses a food, juice, or other tin can __
Wireless Alarm Transmitter & Receiver - Here are two circuits that make it possible to add up to eight detectors to an existing alarm system without running a single cable. Each transmitter has a unique number that is reported to the central unit in the event of an alarm, and the transmitter battery condition is monitored. must register on this site __ Designed by Published in Elecktor July/Aug, 2010
Wireless Auto Tachometer - Anyone performing their own automobile tune-ups knows how important it is to know your engines speed. With this tachometer, you can measure your engines speed without any connections or annoying timing lights. __ Designed by Aaron Cake
Wireless Liquid Level Sensing for Restaurant Applications - Since restaurants often make much of their profits on drinks, it is critical for servers to offer
refills in a timely fashion. We propose wireless liquid level sensing glassware to aid in this task.
Specially instrumented glassware detects fluid levels via a high-resolution capacitance measurement.
A coil embedded in the table inductively couples power to the glasses, and provides a path
for data exchange. Our prototype glass uses a standard microprocessor and a small number of
passive components, making it extremely inexpensive. __ Designed by Paul H. Dietz; Darren Leigh; William S. Yerazunis
Wireless Microphone - Circuit & notes only, no circuit description given. __ Designed by Tony van Roon VA3AVR
Wireless microphone using 741 opamp & 2N3904 - Schematic only__
Wireless Remote Controller Receiver - Schematic Only __ Designed by Jon Fick
Wonderful One-Transistor Radio - This reflex radio project was inspired by Robert Bazian 's design. His reflex radio is the "darndest" thing I have seen and his spectacular results inspired me to come up with my own version. These designs are similar to two-transistor circuits used in some ancient Japanese "Boys Radios" except that the inter-stage transformer directly drives the speaker. __ Contact: Charles Wenzel of Wenzel Associates, Inc.
WWV Converter for the Car - This converter allows an ordinary AM car radio to receive WWV at 10 MHz. WWV transmits the precise time of day and the car is the most common place to need accurate time! Other interesting stations near 10 MHz may also be received including those famous BBC news and science shows. The unit should be constructed in a metal box with antenna connectors compatible with the car radio. __ Contact: Charles Wenzel of Wenzel Associates, Inc.
WWV receiver - Schematic only, no circuit description given__
X10 RF daughter board- receiver - Schematic only __ Designed by Peter Jakab
Xenon Flash Receiver-AIR Transparancy Monitor - I designed this receiver circuit many years ago to monitor the quality of a mile long column of air for future optical communications experiments. The transmitter system (circuit 72 below) uses a powerful xenon flash in conjunction with a large 12 inch . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000
Xtal Radio Plans - The radio in diagram 1 uses a variable inductor (coil) for tuning. The radio in diagram 2 uses a variable capacitor for tuning. Both radios are otherwise the same. The coil consists of 110 turns of 28 gauge enameled magnet wire wound on a 1.5" form. (toilet paper tube is easiest to get, but you can use something like plastic or other non-conductive material- hollow is best. D1 is a common 1N34 germanium diode- this is the detector. The crystal earplug is not the same thing as one would commonly find at your electronics parts store __ Designed by Keith Addison
XTAL-Controlled FM TX (V6) - My FM Wireless microphone V5 has been very popular, both as a beginners project and as a kit. it is interesting that it has also been the biggest cause of lots of e-mail, the most common question being How can I make it crystal controlled?. The oscillator can be made crystal controlled; replace the 2p7 with a 5th harmonic crystal. The oscillator will then be very stable, so stable in fact, that it cannot even be modulated! This means that you could only use it to send CW (morse code) __ Designed by Harry Lythall-SM0VPO
Yagi Antenna - To improve signal transmission or reception in specific directions, basic elements, either vertical or horizontal, can be combined to form arrays. The most common form is the Yagi-Uda parasitic array commonly referred to as a Yagi array or beam. it consists of a driven element which is either a simple or folded dipole and a series of parasitic elements arranged in a plane. The elements are called parasitic because they are not directly driven by the transmitter but rather absorb energy from the radiated element and re-radiate it. __
ZN414 AM Receiver - An AM portable radio receiver made from the ZN414 IC . The ZN414 IC has now been replaced by the MK484 which is identical in performance and pinout. __ Designed by Andy Collison
ZN414 Portable AM Receiver - An AM portable radio receiver made from the ZN414 IC . The ZN414 IC has now been replaced by the MK484 which is identical in performance and pinout. __ Designed by Andy Collison
ZN414 receiver - This is a project from the dim and distant past which has proved to be a real winner. I have used it as the basis for an 8 channel proportional R/C (AM) as well as a 145MHz FM "chat box". The receiver is very simple and is shown below. it consists of a single transistor mixer then a ZN414 radio IC to provide the gain and detection. A 741 OP-AMP is used as the final audio stage, but this could be replaced with an LM380, if you want to drive a small loudspeaker __ Designed by Harry Lythall-SM0VPO
ZN414 SW Receiver - A Short Wave Receiver based on the MK484 (formerly ZN414) that includes the tropical bands and 49 metre bands. __ Designed by Andy Collison |
