USB FM Transmitter MAX2606 - This MP3 Player FM transmitter can be used to listen to your own music
throughout your home. The transmitter circuit use no coils that have to be wound. When this FM transmitter used
in the car, there is no need for a separate input to the car stereo to play back the music files from your MP3
player. . . .
USB RDS Coder Board using
ATmega32 - This board is a RDS coder
using an ATMEL AVR ATmega32. This board can be controled by a RS232 link, USB interface or SPI. TA data is
displayed wiyth a LED and can be controled by : - Hardware input - RS232 - USB - SPI (not yet implemented) . . .
Veronica 1W PLL FM Transmitter - The VERONICA transmitter is a very stable, powerful, and high quality FM
emitter. Thanks to a PLL, the output frequency is controlled with DIP switches. Output power is approximately 1W
with a single regulated 13.8v supply ! (see specifications) Features : * High RF output power : 1W * Full 87.
5-108MHz range (100KHz increment). * Very stable output frequency : Crystal reference & Phase Locked Loop. *
Professional input bandwidth (fully RDS compatible ) * No complex tuning needed. * High quality PCB * Full
documentation & construction details available. . .
VERONICA FM
Transmitter - The Veronica is an easy
to build and tune transmitter for the FM band. It's known for it's stability and clean signal, does not use any
IC's or similar specialized parts, and it has a built-in tuning aid that makes it possible to tune it with no
extra equipment. It's available in two versions, 1 and 5 watts. . . .
Very Simple
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. . . [Edward John Cardew]
Very stable RF bug - . . . [Collin Mitchell's web site]
Very stable transmitter than
can be carried & move while in use, range is 100-200 meters - . . . [Collin Mitchell's web site]
VHF Audio Video Transmitter - Build your own LC Meter and start making your own coils and inductors.
This LC Meter allows to measure incredibly small inductances making it perfect tool for. . .
VHF beacon transmitter - Schematic only, no circuit description. . . [Designer's name not given]
VHF transmitter - . . . [Peter Jakab, Electrical Engineer, Engineer of Informatics]
VHF/UHF Prescaler - The recommended Prescaler is ridiculously simple. It consists of just one
IC, a TV tuner prescaler, the Philips SAB6456A, which can divide by 64 or by 256. This chip is widely available
both new and in the surplus market at much lower prices than conventional divide by 10 prescalers. . . .
VHF/UHF TV Modulator - Simple oscillator that generates a frequency in the VHF or UHF region.
The oscillator is modulated with the video signal and the modulated carrier wave thus generated is fed into the
TV set's aerial input via a cable. Then all that remains to do is tune the TV to the correct frequency. . . .
Video/Audio Wireless
Transmitter - Television signals
operates as two separate transmissions. One for the video and the other for sound. And just like our project, two
different devices are going to be built. . . .
Wireless Alarm Transmitter and 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. . . [Published in Elecktor July/Aug, 2010]
Wireless
Doorbell - The transmitter circuit is
made up of two building blocks, the 303MHz RF oscillator and the 32kHz crystal controlled oscillator. The 303MHz
oscillator consists of a self-oscillating circuit made up of the coil. . . . [email Colin Mitchell: talking AT
tpg.com.au]
Wireless IR H'phone Transmitter - Schematic only, no circuit description included. . . [designer's name
not included]
Wireless microphone using
741 opamp and 2N3904 - . . .
Wireless PLL Stereo FM TX with
LCD - Now you can use your MP3 Player
to listen your favorite tunes through any FM stereo receiver. Wireless FM transmitter wirelessly connects
portable music players to your car or home stereo quickly and easily. Just plug the FM Transmitter into the
headphone jack of your MP3 or any audio source including iPOD, PDA, CD Player, Cassette player or connect it to
your PC or laptop computer. Tune your card stereo or receiver to the clearest FM frequency, and enjoy your
digital music with full sound and convenience. . . .
Wireless transmitter for PIR using Holtek HT12E - Schematic only, no circuit description. . . [Designer's name not given]
WLW 500KW Transmitter Schematic - . . .
Xenon Flash
Transmitter-Air Transparency Monitor
- This is the matching transmitter for the above receiver. The transmitter launches powerful 1000-watt light
pulses that last about 20 microseconds . . . [Hobby Circuit designed by David Johnson P.E., 06/17/00]
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) . . . [from Harry
Lythall's website]
Yaesu FT-897,
FT-857 and FT-817 transceiver-PC interface (YFPI) - This interface is used to fully control a transceiver, from a personal
computer, when operating digital amateur radio modes (made in January 2006). . . [Bjarke Korsgaard's website] |