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TB069: RFPIC12F675 Transmitter Module - Microchip Application Note
Published 20-Jun-03 (app note added 2/06) |
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Telephone FM Transmitter - This FM transmitter attaches in series
to one of your phone lines. When there is a signal on the line (that is,
when you pick up the handset) the circuit will transmit the conversation. In
particular it will radiate from the phone line itself. It is a passive
device - there is no battery. It uses the signal on the phone line for
power. No aerial is needed - it feeds back the RF signal into the phone line
which radiates it in the FM band. The frequency of transmission may be
adjusted by the trimcap. |
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Telephone Transmitter FM - Receive telephone conversations on any
FM radio with this neat little device. …. [Tony van Roon's circuit] |
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The "UnFETtered Crystal Radio! - …. [Site is under construction
right now] |
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The Elektor DSP radio - Many radio amateurs in practice use two
receivers, one portable and the other a fixed receiver with a PC control
facility. The Elektor DSP radio can operate in either capacity….must
register to view circuit… [Published in Elecktor July/August 2010] |
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Three Transistor FM Radio Bug - Electroinic circuit design…. [from Harry
Lythall's website] |
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Tiny RC Cars TX & Charger - The transmitter runs on only 3V whereas most
others run on more voltage. This dirt cheap item uses non-adjustable inductors
so it is not possible to tweak for higher output. The common TX2B chip is manufactured
by HIGHLAND (SHENZHEN) ELECTRONICS CO LTD and by REALTEK SEMICONDUCTOR CORP and
others.... [Reverse engineered schematic by Stepan Novotill] |
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Tire Pressure Monitoring TPM System - Microchip Application Note Published
14-Oct-02 (app note added 2/06) |
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Tracking Transmitter - This beeping bug can be attached to anything from a
glider to a pot-plant and you can track it with an FM radio. …(circuit added 02/07)
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Tracking Transmitter reconnsworld - (electronic circuit added 9/03)
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Transmitter accurately transfers voltage input - 15-May-03 Issue of EDN
When you connect remote sensors to a central process controller, a simple, robust, and
commonly used interface is the 4- to 20-mA loop. The advantages of this current loop
include the simplicity of just two twisted wires that share both power and signal, the
loop's high noise immunity in harsh environments, and the de facto loop standard
within the process-control industry.... [Design Idea by Clayton Grantham, National
Semiconductor, Tucson, AZ] |
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Transmitter FM 45W with valve - designed by Kyriakos Kontakos
(schematic / circuit added 05/06/07) |
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Transmitter senses triple relative-humidity figures - 26-Sep-02 Issue of EDN
The circuit in Figure 1 is a triple, relative-humidity sensor and radio transmitter.
Sensors 1 and 2 form two gated oscillators with natural frequencies of 10 and 5 kHz,
respectively, at relative humidity of 50%. The gated oscillators use variable
resistances R2 and R3, respectively. Together, these two oscillators generate FSK-modulated
outputs at output of IC1B, Pin 6.... [Design Idea by Shyam Tiwari, Sensors Technology
Ltd, Gwalior, India] |
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Transmitter using LM317 - Electroinic circuit design…. [from Harry Lythall's
website] |
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Transmitter-5 Watt - This is a very simple 5 watt CW TX based upon a TTL
logic chip. There is just one "tricky" component and this is Cx. This component
should have an impedance of about 10 - 50 ohms at the frequency of interest. If you
wish to reduce the transmitter power, increase the value of Cx. It is Cx which causes
the square wave from the output transistor to approximate a sine waveform. The value
of Cx is the price of simplicity in this TX.... [from Harry Lythall's website] |
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Transmitters 27 & 303MHz - In this discussion we cover 27MHz transmitters
and receivers as found in remote control cars, aeroplanes, walkie talkies and some of
the older-style garage door openers. We have provided a number of circuits so you can
work out the best type for your application and these circuits will also help you
understand which components are critical and which components....(design added 04/09)
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TV Transmitter - A VHF band TV transmitter using negative sound modulation
and PAL video modulation. This is suitable for countries using TV systems B and
G…. [Submitted by David Kwaku Celestin] |
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Two Transistor Circuit replaces IC (Hagtech) - I am always impressed with
the way semiconductor manufacturers go out of their way to make the end designer’s job
easier. One example is the LTC4300 recently introduced by Linear Technology…. [Jim
Haggerman, Hagerman Technology LLC] |
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Two Transistor FM Transmitters - This circuit will flash a bright red
LED (500 mcd as an attention getting device or fake car alarm. Componten Values
are not criticl and transistors may be used. Flash duration is determined by
R2…. [Bill Bowden's circuit |
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Two Transistor FM Transmitters (Rob van der Weijden) - A compact 2
transistor transmitter for use at VHF frequencies…. [Andy Collison's circuit] |
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Two Valve 40m CW Transmitter - amateur radio construction projects….circuit
only, no description given…. [from Peter Parker's website] |
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TX200 High Quality 200mW FM Transmitter - Here is the latest and greatly
improved TX200 VFO/VCO FM transmitter. The most versatile transmitter to date that can
be turned into high fidelity stereo PLL based 200mW FM transmitter. It is a perfect
circuit for transmitting your music around the house and yard....(8/06) |
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TX300 300mW FM Transmitter - Here it is a brand new TX300 FM transmitter.
The amplifier has exactly the same architecture as TX500 with the difference that
TX300 has only one stage variable VHF amplifier….(08/06) |
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TX500-500mW FM Transmitter - The TX500 is a simple to build 500mW FM
Transmitter. It consists of three blocks; modulator / oscillator, two stage 500mW VHF
amplifier and LED based power meter. The TX500 allows to transmit audio signals to FM
band at frequencies from 88 MHz to 108 MHz....(8/06) |
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UHF-TV Preamplifier - UHF-TV Preamplifier |
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Unusual Frequency Dividers - (electronic circuit added 7/03) |
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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.
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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) |
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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 approximatively 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 bandwith (fully RDS compatible ) *
No complex tuning needed. * High quality PCB * Full documentation & construction
details available.….(Circuit design added 12/08) |
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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 approximatively 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 bandwith (fully RDS compatible ) *
No complex tuning needed. * High quality PCB * Full documentation & construction
details available.….(Circuit design added 12/08) |
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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. .... |
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Very stable RF bug - (diagram added 05/07) |
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Very stable transmitter than can be carried & move while in use, range is 100-200
meters - (diagram added 05/07) |
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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…(design added 08/08/08) |
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VHF beacon transmitter - Schematic only, no circuit description |
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VHF transmitter - ….(Circuit design added 04/09) [Peter Jakab, Electrical
Engineer, Engineer of Informatics] |
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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. |
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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. |
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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. |
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Video/Audio Wireless Transmitter - To design and build a wireless
transmitter that works over the FM frequency and allows the transfer of a video/audio
signal over a certain distance to a FM tuner.circuit diagram and project description
(added 5/02) |
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Wide Band RF Amplifier for 10MHz-500MHz Input - This paper describes an RF
amplifier circuit which is suitable for the frequencies between 10MHz and 500MHz.
These kind of amplifiers are called wide band amplifiers.(07/07/07) [Author is Yilmaz
Kalafat, PE1PYJ] |
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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/August 2010] |
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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….(diagram
added 05/07) |
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Wireless Microphone - Circuit & notes only, no circuit description given….
[Tony van Roon's circuit] |
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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. |
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WLW 500KW Transmitter Schematic - (electronic circuit added 7/03)
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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] |
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Zero Voltage Drop Heavy Duty Power Supply for SSB - (added 5.07)
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