Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 40,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to original material posted by the designer. 
Please let us if you would like us to link to or post your design.

HOME Schematics Index Discover Forum Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches

Transmitter Circuits, Page 5
Transmitters:  #'s - B       C - F       G - M      N - S      T - Z
Last Updated on: Thursday, October 30, 2014 09:22 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

TB069: RFPIC12F675 Transmitter Module -  Microchip Application Note Published 20-Jun-03  (app note added 2/06)
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.
Telephone Transmitter FM -  Receive telephone conversations on any FM radio with this neat little device. …. [Tony van Roon's circuit]
The "UnFETtered Crystal Radio! -  …. [Site is under construction right now]
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]
Three Transistor FM Radio Bug -  Electroinic circuit design…. [from Harry Lythall's website]

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]
Tire Pressure Monitoring TPM System -  Microchip Application Note Published 14-Oct-02  (app note added 2/06)
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)
Tracking Transmitter reconnsworld -  (electronic circuit added 9/03)
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]
Transmitter FM 45W with valve -  designed by Kyriakos Kontakos  (schematic / circuit added 05/06/07)
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]
Transmitter using LM317 -  Electroinic circuit design…. [from Harry Lythall's website]
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]
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)
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]
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]
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
Two Transistor FM Transmitters (Rob van der Weijden) -  A compact 2 transistor transmitter for use at VHF frequencies…. [Andy Collison's circuit]
Two Valve 40m CW Transmitter -  amateur radio construction projects….circuit only, no description given…. [from Peter Parker's website]
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)
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)
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)
UHF-TV Preamplifier -  UHF-TV Preamplifier
Unusual Frequency Dividers -  (electronic circuit added 7/03)
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 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)
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)
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 stable RF bug -  (diagram added 05/07)
Very stable transmitter than can be carried & move while in use, range is 100-200 meters -  (diagram added 05/07)
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)
VHF beacon transmitter -  Schematic only, no circuit description
VHF transmitter -  ….(Circuit design added 04/09) [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.
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)
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]
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]
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)
Wireless Microphone -  Circuit & notes only, no circuit description given…. [Tony van Roon's circuit]
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.
WLW 500KW Transmitter Schematic -  (electronic circuit added 7/03)
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]
Zero Voltage Drop Heavy Duty Power Supply for SSB -  (added 5.07)

Transmitters:  #'s - B       C - F       G - M      N - S      T - Z


HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy

Copyright  2002 - 2014 David A. Johnson & Associates.  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.