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Transmitter Circuits

Transmitters:  #'s       A - C       D - L       M - P       Q - S      
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Last Updated: November 30, 2017 07:38 AM




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

SAA1057 PLL Synthesized FM Transmitter -  The functioning of all is provided by a microcontroller from MIC ROCHiP "PIC 16F84" which provides support for buttons, LCD 2 lines of 16 characters and the circuit pll "SAA1057.  The VCO is entrusted to the transistor Q8 associate of his two diodes varicaps "BB109, a floor buffer Q7 separates the VHF signal obtained in two ways, on the one hand to Q9 to enslave loop phase and on the other hand to the Q5 and Q6 together which takes care to amplify the signal before attacking Q11, a "BFR96" which plays the role of HF switch via a timer "NE555" which receives information from the push and "SAA1057" ensuring HF cutoff in the event of failure of a locking or unlocking of the pll.  __ 

SAA1057 PLL Synthesized FM Transmitter -  French.  The functioning of all is provided by a microcontroller from MIC ROCHiP "PIC 16F84" which provides support for buttons, LCD 2 lines of 16 characters and the circuit pll "SAA1057.  The VCO is entrusted to the transistor Q8 associate of his two diodes varicaps "BB109, a floor buffer Q7 separates the VHF (08/08/08) __ 

SAW-based 434MHz transmitter schematic with RO2101 1-port SAW resonator -  Schematic only __ Designed by Peter Jakab

SAW-based transmitter -  Schematic only __ Designed by Peter Jakab

SAWR-based transmitters -  This application note describes the physical principle of SAW-stabilized oscillator.  Oscillator structures for one- and two-port SAW resonators are discussed.  An application example for a 433.92MHz transmitter for keyless entry is given. __ Designed by Alexander Glas

SCA Adapter -  For Advertisement Free Background Music on FM.   __ Designed by G.L. Chemelec

Sensitive FM Transmitter -  This easy to build FM transmitter bug can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Transmitter frequency range is 88-108 MHz. Max current consumption is 30mA. You can power the fm transmitter bug with a 9Volt Battery, or you can plug a power supply to feed in 9-12 Volts. __ 

Sensitive FM Transmitter -  Schematic only, no circuit description __ Designed by Andy Wilson

Sensitive FM transmitter -  Schematic only, no circuit description __ Designed by Andy Wilson

Sensitive FM Transmitter -  Circuit + Parts List + Notes __ Designed by Tony van Roon  VA3AVR

Sensitive FM Transmitter Bug -  This easy to build FM transmitter bug can transmit voice to exceptionally good range.  Tune trimmer to hear the signal to your near radio.  Transmitter frequency range is 88-108 MHz.  Max current consumption is 30mA.  You can power the fm transmitter bug with a 9Volt Battery, or you can plug a power supply to feed in 9-12 Volts.  That bug will pick even a low whisper or even the sound of a breath well far from the microphone.  Great spy transmitter equipment.__ 

Short Wave AM Transmitter -  The main feature of this transmitter is that it is free from the LC (inductor, capacitor) tuned circuit and operates on a fixed frequency of 12 MHz which is extremely stable....__ Electronics Projects for You

Short Wave Regenerative Receiver -  Sensitivity and selectivity are the major concerns of a short wave enthusiast when he looks up for a receiver.  Commercial communications models with superhet circuitry surely satisfy his requirements, but these are expensive.  He would rather go for a Homebrewed radio, being a regenerative receiver an affordable choice __ Designed by Ramón Vargas Patrón

Short Wave Transmitter -  This transmitter circuit operates in shortwave HF band (6 MHz to15 MHz) , and can be used for shortrange communication and for educational purposes.  The circuit consists of a mic amplifier, a variable...__ Electronics Projects for You

Shortwave Bug -  Circuit and notes only, no circuit description given.   __ Designed by Tony van Roon  VA3AVR

Simple Circuit & Sensitive Shortwave Receiver -  Radio Shack offers a series of pamphlets ranging from Communications to Digital Electronics.  I have collected all 9 pamphlets.  if you are ever in the store, do take a look at all the wonderful projects these pamphlets have to offer!  The projects are very diversified, useful and simple to make.   __ Designed by braincambre500 @ yahoo.com

Simple Circuit 10GHz RS232 high speed link using FM  -  The poor man's high speed microwave link.  Still working on this.  it uses a XC9536 CPLD to link to a serial line, this chip has a built in UART, differential encoder/decoder and a manchester encoder and decoder.  it just fits in a simple 36 block device but I am still battleing with the FM decoder which is to be as simple as possible.  Favoured project is the DVB IP Gateway so this one has moved to the rear end of my priority list. (Sorry)  __ Designed by Edward John Cardew

Simple Circuit 430MHz band FM transmitter uses only 2 FETtransistors -  if you want to make and test your own handmade transmitting equipment, you can make the HF CW transmitter with crystal oscillator.  You can receive your CW signal with your HF transceiver.  The transceiver in these days has an ability of "wide band receiver".  it is easiest way for you, if you have HF transceiver.  But if you have only 430 FM handy, please make this gear to start your handmade activity.   __ Designed by Sunamura Kazuhiro

Simple Circuit 4-CH Remote Control -  You can construct your own long range infrared (iR) wireless remote using Motorola's MC145026 emitter and MC145027 detector chips.  With your remote you can control devices up to 20 feet (7 meters) away.  it operates similiarly to a TV remote.  You just point the emitter at the detector, push a transmit button.  The detector then interprets your data signal.  You can use this circuit to remotely turn on/off devices (like a motors, relays, home appliances).   __ Designed by Boondog web site

Simple Circuit AM Transmitter -  There are not many AM transmitters that are easier to build than this one because the inductor is not tapped and has a single winding.  There is no need to wind the inductor as it is a readily available RF choke.  To make the circuit as small as possible, the conventional tuning capacitor has been dispensed with and fixed 220pF capacitors used instead.  To tune it to a particular frequency, reduce one or both of the 220pF capacitors to raise the frequency or add capacitance in parallel to lower the frequency.  Q1 is biased with a 1MO resistor to give a high input impedance and this allows the use of a crystal ear piece as a low cost microphone.__ 

Simple Circuit AM transmitter using a BFW10 FET -  Here is a low-cost, good-stability RF / Am transmitter which uses only one FET.__ 

Simple Circuit Audio FM Transmitter -  FM transmitters can be complicated to build, but not this one it’s about the easiest you can possibly make.  And though the science of radio is well understood, there’s a magical, emotional quality about it that we don’t often stop to appreciate.  You will not forget the first time you pick up a transmission broadcast from a device you soldered together, yourself, from a few bits of copper, carbon, plastic, and wire.__ 

Simple Circuit Coil Less FM Transmitter -  For months i’ve been looking for a simple FM BUG project, the ones online require inductors which you either have to acquire or build, if you don’t have a LCR meter it becomes rather hard to get the circuit working, specially if you’re a beginner without an oscilloscope!  – Sometimes they don’t even tell you which inductance is required and you have to calculate an estimate, which is the main reason why many high frequency RF projects fail in the first place.  This circuit on the other hand performs pretty well, even if you’re manipulating the board or touching the coax it will stay within the tuned frequency (unless you touch the transistor or timing capacitor!).__ 

Simple Circuit CW transmitter for 80M -  This simple circuit will give about 1.2 Watts of output when powered from a 13.8VDC supply.  if you don't have a 2SC1237, try any other 12V CB radio output transistor 2SC1969, 2SC1307 etc.  The value of RFC is not critical, 10 turns on a high permeability ferrite toroid core works fine.  I used a DPDT switch for the RX/TX switching, one pole for the aerial (antenna) , the other pole to switch the 13.8V supply. __ Designed by EI9GQ homebrew radio

Simple Circuit FM Microphone -  Here is the super NEW miracle improved "Frequency Modulation Wireless Microphone" (BUG) with added easablilty, readability and copyability.  This was necessitated after the number of E-Mail questions posed by people who were confused by the layout of the project (s).  Before proceeding with the interesting bits, please note __ Designed by Harry Lythall-SM0VPO

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

Simple Circuit FM Transmitter -  Simple FM transmitter with a single transistor.  MinI FM transmitters take place as one of the standard circuit types in an amateur electronics fan's beginning steps.  When done right, they provide very clear wireless sound transmission through an ordinary FM radio over a remarkable distance.  I'veseen lots of designs through the years, some of them were so simple, some of them were powerful, some of them were hard to build etc.__ 

Simple Circuit FM Transmitter -  This FM transmitter is about the simplest and most basic FM transmitter it is possible to build and have a useful transmitting range.  it is surprisingly powerful despite its small component count and 3V operating voltage.  it will easily penetrate over three floors of an apartment building and go over 300 meters in the open air.  The circuit we use is based on a proven Australian design.  it may be tuned anywhere in the FM band.  Or it may be tuned outside the commercial M band for greater privacy. (Of course this means you must modify your FM radio to be able to receive the transmission or have a broad-band FM receiver.) The output power of this FM Tx is below the legal limits of many countries (eg, USA and Australia).  However, some countries may ban ALL wireless transmissions without a license.  it is the responsibility of the builder to check the legal requirements for the operation of this circuit and to obey them.__ 

Simple Circuit FM Transmitter -  This FM transmitter (FM Tx) is about the simplest and most basic FM Tx it is possible to build and have a useful transmitting range.  it is surprisingly powerful despite its small component count and 3V operating voltage.  it will easily __ Designed by YMYA electronics - IZHAR FAREED

Simple Circuit FM Transmitter Bug -  This is a simple design of a small FM Transmitter Bug that's perfect for transmitting and eavesdropping purposes.  Due to the high sensitivity, even the ticking of the clock to hear.  The range is estimated at anything from 50 meters.  With a small piece of wire as an antenna to get at least the whole house.  L1 and L2 are two equal air pools.  They each consist of 5 turns at a diameter of about 4 mm.  The thickness of the wire does not matter, 0.5 mm works perfectly.  C4 is the frequency adjustment.  Tune an FM radio in an empty area of the FM band C4 to turn your silence or hear a whistle.  From what you can precisely adjust the radio and the transmitter installed in a room somewhere to intercept.  Note: Because these transmitter bugs inherently unstable, you better read the short legs of the components keep the circuit mechanically tightly together up.  Also placing a 1 nF capacitor (C6) will benefit stability.  R1, R3, R4: 4K7 R2: 100K R5: 10K R6: 270 Ohms C1, C2: 10 uF C3, C6: 1 nF C4: 2-18 pF trimmer C5: 5.6 pF L1, L2: air puddle windings on May 4 mm in diameter (see text) T1, T2: 547 BC Condenser microphone Original Text: Ook het plaatsen van een 1 nF condensatortje (C6) over de voedingsaanluitingen komt de werking ten goede.  [Origineel TinyCAD ontwerp] Show alternative translations__ 

Simple Circuit FM transmitter using a single transistor -  Here, is a very interesting and simple project in the series of communication used to transmit noise free F.M. signal in the wide range up to 100 M using only one transistor. The transmitted message from F.M. transmitter circuit is received by the receiver having the facilities of F.M. channel or you can also try F.M. receiver circuit published in this website.__ 

Simple Circuit FM Transmitter with a Single Transistor -  MinI FM transmitters take place as one of the standard circuit types in an amateur electronics fan's beginning steps.  When done right, they provide very clear wireless sound transmission through an ordinary FM radio over a remarkable distance.  I'veseen lots of designs through the years, some of them were so simple, some of them were powerful, some of them were hard to build etc.   __ Designed by Kamran Ahmed-UK

Simple Circuit FM Transmitter with BC549 -  This is simple FM transmitter for FM broadcast band in 88-108 MHz.  BC 549 is small signal transistor for wide applications, but usually for AF.  You can build simple FM transmitter with one BC549 transistor and several other component parts.  Simple FM transmitter with only one transistor is often called “bug”.  This project is suitable for beginners in radio amateur, education, or hobbies.  As an antenna you can connect 150cm of copper wire.__ 

Simple Circuit IR transmitter -  This is an IR transmitting circuit which can be used in many projects (I designed this to try to make my 3D glasses wireless).  This IR transmitter sends 40 kHz (frequency can be adjusted using R2) carrier under computer control (computer can turn the IR transmission on and off).  IR carriers at around 40 kHz carrier frequency are widely used in TV remote controlling and ICs  for receiving these signals are quite easily available. __ Designed by Tomi Engdahl

Simple Circuit Limiter -  Audio signals as music or speech have big dynamic ranges.  There are silent and loud sections.  These audio signals aren't too good for a transmitter, which requires audio signal with constant level on the input.  Limiter is a device,  __  Jan Kolar

Simple Circuit Miniature FM Transmitter -  I found this FM transmitter circuit on the internet, it works very well and it is very simple to build, even for amateurs.  I managed to squeeze all the parts on small 1.5 x 2 cm PCB.  When using small wire antenna and 3V power the range is 50m.  The coil has 10 turns on a 3 mm diameter and is wound with 0.3 mm copper wire.  The microphone is an electret type.  Transmitting frequency is changed by stretching or compressing the coil.  Furthermore, we can change the frequency by changing C2 capacitor (10pF capacitor with a frequency of about 88MHz, with 8.2pF 95Mhz and 6.8pF 104Mhz).  Further tuning to the correct frequency is done through the coil.  Transmitter can be powered by 3V button battery.__ 

Simple Circuit MP3 FM Transmitter -  A simple MP3 FM transmitter circuit shown here can be built easily in few minutes if all parts are available to you.  All the components used in this transmitter circuit are general purpose and low cost.  The circuit will work as a best FM transmitter for simply broadcasting your music around your house and yard, and can be used to broadcast the output of any equipment like mp3 player, ipod, satellite, etc.__ 

Simple Circuit QRSS callsign keyer based on an Atmega AVR programmed in C -  Microcontroller based electronic circuit __ Designed by Hans Summers

Simple Circuit Repeater Fan Controller -  an 18 kB PDF file __ Designed by Robert Shepard KA9FLX

Simple Circuit RF Power Meter -  Here is a simple set up which will enable them to measure the out put power of their transmitter.  All that they require is a good multimeter which has a sensitivety of 20k ohms/4 Watts which is adequate for low power transmitters.  __ 

Simple Circuit RF signal meter with LEDs -  The simple but effective circuit presented here converts an RF input signal into a visible LED indication.  Only discrete components are used.  The circuit can be used as field strength analyser or RF Wattmeter when a 50 ohms resistor is connected between ground and HF (J1).  Calibration required.  Of course you can add extra LED stages in case you want to extend the range.  The second picture shows how the circuit can be build on a very small piece of vero-board.   __ Designed by Ron Zoetermeer, JO22gb, Netherlands

Simple Circuit RF Transmitter -  This is probably the simplest radio transimtter that you will find anywhere.  it has a total of five parts and can be constructed into a very samll space __ Designed by Andy Wilson

Simple Circuit RF transmitter -  Schematic only, no circuit description __ Designed by Andy Wilson

Simple FM Transmitter -  There is no thrill like the thrill you get from operating equipment you have built yourself.  if you have never built a project from a magazine before, let this be your first--you'll see how much satisfaction and fun you can have!  __ Designed by Tony van Roon  VA3AVR

Simple, Cheap 433MHz Locator Transmitter -  So you made last month's 433MHz "sniffer" receiver and now fancy some adventurous tracking? Here's a versatile PIC AXE-08M controlled transmitter, based around Jaycar's ZW-3100 companion 433.92MHz ASK (Amplitude Shift Keying) module.  While relatively short range, this transmitter makes a great model plane or model rocket locator and/or tracking beacon - something we?ve been asked about numerous times__ SiliconChip

Simplest FM Transmitter -  This simple FM Transmitter takes audio input through a 1/4" phono jack and, constructed as shown, without the optional antenna connections, will broadcast an FM radio signal about 30 feet.  This is the standard model of simplest FM transmitters includes a trim capacitor to adjust the transmitting frequency.  it can be powered by a 9V battery and uses a hand-turned copper coil.  The circuit is extraordinarily simple and could be built on perfboard or on a panel almost as easily.__ 

Simplest RF Transmitter -  This is probably the simplest radio transimtter that you will find anywhere.  it has a total of five parts and can be constructed into a very samll space __ Designed by Tony van Roon  VA3AVR   

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Transmitters:  #'s       A - C       D - L       M - P       Q - S       T - Z


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