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A SCA Adapter - For Advertisement Free Background Music on FM. __ Designed by G.L. Chemelec
A Simple Circuit Echolink interface - Easily constructed with about $10 in parts from Radio Shack. Should work with any radio. __ Designed by Courtesy of Matt Krick K3MK
A Simple Circuit FM Stereo Transmitter - (ATTiNY12, ATTiNY25, ATtiny2313, AT90S2313, AT90S232, or nearly any other CMOS
microntroller-Yes probably even a PIC !) This project appeared in the December, 2007 issue of infoElektronika Magazine __ Designed by © Richard Cappels
A Simple Circuit Repeater Fan Controller - Unlike many repeater systems, our local club repeater has always been located within a member’s home, many times in a basement or in this case, my home office area. The latter created a desire to lower the noise level generated by the repeater, specifically, the power amplifier cooling fans. __ Designed by Robert Shepard KA9FLX
A Simple Circuit VFO for 80 & 160 Meters - This VFO is simple to build and is quite stable. The VFO produces a two phase output (2 outputs) , making it well suited to supplying a signal to either single ended RF amplifiers, where only one__
A small FM transmitter (SMD) - This SMD FM transmitter has an operating frequency of about 80 to 115MHz. Under reasonable circumstances you will be able to receive its signal at a distance of about 200 meters. Although it is low-power, it might be illegal in your part of the planet. __
A Spark Transmitter! - Now this isn't really for QRP (in fact, it's not at ALL for QRP) , but it was in the projects list, and since the original poster included it (as a joke) , I thought I'dmake it available too. __ Designed by Harry Lythall-SM0VPO
A Superregen Receiver for FM broadcast or Aircraft band AM reception - This is the receiver I was bragging about on the Radio index page -- the receiver that is so sensitive it can hear the local oscillator inside a small transistor radio 30 - 50 feet away. Build one of these little gems and you will be able to hear aircraft pilots many miles away with nothing more than a 24" whip antenna. __ Designed by Rick Andersen
A to D for AM ateur Scientists (Not for Radio-SkyPipe Use) - This is a Radio Astronomy Project __ Designed by Radio-Sky Publishing
A Tone Beep Keyer for Repeaters - Obtain an Audible indication of Off-Frequency Operation. __ Designed by Originally Art Gentry W6MEP. Reprinted from May 1974 QST.
A Two-Way Morse Practice Set - The first step to learning Morse is to be able to memorise the sounds of all letters and numbers. This can be accomplished with the help of Morse practice tapes or classes. Once you know all the characters, the WiA Morse practice broadcasts and/or continuous VHF Morse beacons can be used to increase your receiving speed. __ Designed by Peter Parker VK3YE
A VHF/UHF/LINK repeater interface/controller - This is a set of nearly identical schematics for circuitry used to provide cross-band inter-agency communications. __
A/V Sender - This small circuit transmitter processes the signs of audio of a sound table or microphone, and the signs of video of a camera, or still the audio signs and video of a DVD, Video-cassette or even it sweats her video plate has an exit of composed video, you can transmit direct of your computer. Playing them in a channel free from the strip of VHF __ Designed by Toni on Aug 19, 2009
Achieve Simple Circuit IR data transmission from a PC’s serial port - 10/11/07 EDN Design ideas: By transmitting appropriate hex values from a PC's serial port to a pair of IR LEDs, a remote-control IR receiver can enable 38.4-kHz data transmission Design by Andreas Grün, Wedemark, Germany
Active FM Antenna Amplifier - This simple little circuit can be used for AM, FM, and Shortwave (SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna. it is further more designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios __ Designed by Tony van Roon VA3AVR
Add a signal-strength display to an FM receiver IC - 09/05/02 EDN Design ideas: The Philips (www. semiconductors. philips. co) TDA7000 integrates a monaural FM-radio receiver from the antenna connection to the audio output. External components include one tunable LC circuit for the local oscillator, a few capacito Design by José Miguel-López, RF Center Ltd, Barcelona, Spain
ADSB Receiver - With this design you can expect to get several 100 km range with a good antenna. I use a home made J-pole with a single 32 Eurocent BFP420 transistor giving excellent low noise gain for very little money. it can be bought like most of the needed components at Reichelt. Many good quality (Kathrein for example) Satellite L band line amplifiers use this transistor and if you can get at least 12 Volts to the preamp they offer excellent performance despite being laid out for 75 Ohms. i'll document the preamp later. This is what you can get in Luxembourg with a clear view to the South for several kilometers __ Designed by Edward John Cardew
AIR Transparency Monitor, Xenon Flash Transmitter - This is the matching transmitter for the above receiver. The transmitter launches powerful 1000-watt light pulses that last about 20 microseconds. . . Circuit by Dave Johnson P.E.-June, 2000
All-Digital Stereo FM Transmitter with RDS based on AD9852 DDS (PDF) - This resume describes the realization of a fully digital stereo FM Transmitter with RDS capability (Radio Data System) , based on software radio architectures using FPGAs. This system can be remotely controlled by means of a WEB interface. __ Designed by Henrique C. Miranda, Filipe M. M. da Silva e Sousa, Rui Manuel F. S. M. Oliveira
Altoids Tin LowFER Transmitter - Here's a complete LF Beacon transmitter for LowFER (Low-Frequency Experimental Radio). The transmitter is designed for license-free operation between 160 kHz and 190 kHz, consuming the legal limit of 1 watt power input to the final RF output stage. For fun, the complete transmitter is built into an Altoids mint tin. The circuit is built dead-bug style on a piece of copper clad circuit borad material, lightly painted with Testors transparent Hot Rod Red to prevent tarnish. The paint doesn't seem to make soldering any more difficult. The board is grounded to the tin in a few places. __ Contact: Charles Wenzel of Wenzel Associates, Inc.
ALTOIDS Tin Part 15 Version FM Transmitter - The transmitter uses 2 MPSH10 (equiv BF494 or NTE229) transistors in a double-ended free-running voltage controlled oscillator (VCO) operating at half the output frequency on each side and combined at L2, which is tuned to the 2nd harmonic of the VCO and covers the 88-108 MHz range. A standard 9 volt battery is used for power and fits inside the tin. The mono audio input circuit is totally passive with 70us pre-emphasis provided and the audio quality is great.__
AM DSB Transmitter for Hams - circuit diagram of simple double side band suppressed carrier (DSBSC) transmitter for hams. Circuit uses crystal oscillator, crystal can be switched for multI band operation__
AM Radio Transmitter using 555 Chip - This project shows how to build a simple AM radio transmitter based on 555 timer IC . The circuit parts are: the 555 timer IC , a NPN transistor three caps, three resistors and a potentiometer. The circuit is able to generate an amplitude modulation signal at 600Khz and you are able to receive it using a plain AM receiver. The range is about 30-40 feet.__
AM Transmitter - The circuit is in two halfs, an audio amplifier and an RF oscillator. The oscillator is built around Q1 and associated components. The tank circuit L1 and VC1 is tunable from about 500kHz to 1600KHz. __ Designed by Andy Collison
AM/FM Simultaneous Transmitter using Digital IC - We are familiar with transmitters either working in AM or in FM. But this circcuit transmits both AM and FM signals simultaneously at different frequencies; AM in 20 Mhz and FM in 100 Mhs. __ Designed by aswinkuma v
AM-FM-SW Active Antenna - This simple little circuit can be used for AM, FM, and Shortwave (SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna. it is further more designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios __ Designed by Tony van Roon VA3AVR
An Audio-Noise-Based Voting - As hand-held transceivers (H-Ts) become smaller, and low power, battery conserving operation becomes more popular, the disparity between the transmitting range of a typical 100 watt repeater compared to the repeater accessing range of a typical 1 watt or less H-T becomes more and more apparent. How often have you found it difficult (or impossible) to access a repeater with a low power H-T even though you can hear the repeater at full quieting? This can happen even if the repeater is equipped with a high sensitivity, state-of-the-art receiver. __ Designed by Mark Kolber WB2WHC
An SSB transmitter - This project is relatively simple to construct, and will give a "presentable" SSB signal on the lower HF amateur bands. Above 14MHz frequency stability may become a little annoying to the listener due to this TX being VFO controlled, but with a little care, and attention to 2nd oscillator component temperature and mechanical stability, operation on 18MHz should be possible __ Designed by Harry Lythall-SM0VPO
Antenna & RF preamp for weather satellites - All the details for a simple turnstile/reflector antenna plus an RF preamp that mounts up on the mast to really drag on those satellite images.__ SiliconChip
Antenna 1/4 wave for 940 to 980MHz easy homemade - My Radio amateur callsign is OZ2CPU. I like to use Atmel AVR Atmega PIC 16 PIC 16F876 PIC 16F84. Most electronics easy made for the novice and something is for the more experienced. __ Designed by Thomas Scherrer OZ2CPU
Antenna height measurement made easy - My Radio amateur callsign is OZ2CPU. I like to use Atmel AVR Atmega PIC 16 PIC 16F876 PIC 16F84. Most electronics easy made for the novice and something is for the more experienced. __ Designed by Thomas Scherrer OZ2CPU
Antenna Switch for Dicke Switching Receivers - This is a Radio Astronomy Project __ Designed by Radio-Sky Publishing
Antennas for Ham Transmitters - Describes how to construct various type of antenna for Ham Radio Transmitters__
AP2000 VHF reconstructed to a DUAL VCO Police Scanner with PIC & LCD - My Radio amateur callsign is OZ2CPU. I like to use Atmel AVR Atmega PIC 16 PIC 16F876 PIC 16F84. Most electronics easy made for the novice and something is for the more experienced. __ Designed by Thomas Scherrer OZ2CPU
ATV Repeater Controllers - Specifications and designs are subject to change without notice.
Use on your own risk. __ Designed by Mijo Kovacevic, S51KQ
Audio Amp + 3Khz Filter - This circuit is the audio amp section for a complete optical transmitter. The circuit amplifies and filters the voice audio signals from an electret microphone. The circuit is described in more detail in. . . Circuit by Dave Johnson P.E.-June, 2000
Audio/Video Sender - This circuit provides you with wireless audio and visual transmission to a TV. The TV acts as a receiver, eliminating the need to buy a separate monitor. You can also hook it up to a VCR or CCD Camera, and even set up a remote CCTV security system! Circuit design __ Contact info @ wzmicro.com
Automatic Repeater - This circuit will be of interest toradio amateur and anyone possessing two radios, (one of which must be able to transmit i. e. a transceiver). it is a self powered (audio derived) repeater circuit for receiving a signal and re-transmitting it viaor radio. __ Designed by Miroslav Adzic
Automatic Tuner-Tranceiver Interface ATTI for IntelliTune MFJ-993 (TM) by OZ2BKK (updated 4'th of october 2005) - PIC 16F876 based circuit controlling the Yaesu FT-817, FY-857 and FT-897 from the intelliTune MFJ-993 tuner (made in May 2005) __ Designed by Bjarke Korsgaard
AV Audio/Video Wireless Transmitter - This circuit provides you with wireless audio and visual transmission to a TV. The TV acts as a receiver, eliminating the need to buy a separate monitor. You can also hook it up to a VCR or CCD Camera, and even set up a remote CCTV security system! Circuit design __ Contact info @ wzmicro.com
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