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Transmitter Circuits
Transmitters:  #'s       A-C       D-G       H-Q       R-T      

Last Updated on:
Sunday, August 23, 2015 06:02 AM

5 Channel RF AVR Remote Control -  How many times you needed some remote control to handle some electric device ? many times. There are lot of remote controls like infrared, RF, SMS (like my other circuit) and more. The basic small-range remote controls are 2, Infrared and RF (Radio Frequency). One of the weaks of Infrared is that the signal can not pass the walls. So, if you want to control your garage door, the only way is to use some RF remote control. The circuit (transmitter and receiver) use few components and ordinary (I love few component circuits). Its easy to build it because you don't have to tune-up any coil or variable capacitor. The RF modules are fix to work in 418MHz area. . . . 

5 Watt 80 Meter QRP CW Transceiver -  A great deal of interest has been generated by my previous design articles, so I decided to go to work on a full blown transceiver design. After several months of work, the ROSE-80 transceiver was born. This transceiver is similar to other designs but contains some unique differences. This design boasts the following features. . . 

5 Watt FM Amplifier -  This design is a 2 stage amplifier that has about 17db of gain, suitable for an input of 50 to 100 MW. Its basically a Veronica 5 watt vco transmitter, without the vco. The transistors are a 2N4427 and a MRF237. Output power is 2.5to 5 watts, depending on input drive and dc voltage. At 13.7 vdc with 50 MW of drive, the output was 2.5watts. The maximum dc voltage recommended is about 15-16 volts. . . . 

5 Watt FM Transmitter with Antenna 88-108 MHz -  Two stages -- AUDIO AMPLIFIER AND OSCILLATOR and RF POWER AMPLIFIER. . . 

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5 Watt HF CW transmitter -  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. . .  [Harry, SM0VPO Email: harold.lythall @ era.ericsson.se]

5 Watt UHF TV Amplifier -  This small circuit is a Linear amplifier for driving small UHF TV transmitters. Its gain is 7dB and can amplify a signal between 450-800 MHz. You can drive the circuit with 1 to 1, 5 Watts signal. Better use double layer PCB with the second layer connected to earth. . . 

500mW AM transmitter for the 20 meter band (14MHz) -  In this project, you will make a simple low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator. You can connect the circuit to the an electrec microphone (pointed out in gray on the diagram) or amplified dynamic microphone (no amplified microphone has a to low output voltage to work. Approx. 100mv is needed). You could also add a LF preamp stage of one transistor to allow connecting a dynamic microphone directly. . . .  [by Guy Roels ON6MU]

500mW HF Linear Amplifier -  Site is gone, anybody have a new URL?. . .  [from Harry Lythall's website]

50MHz power Amplifier -  Schematic only, no circuit description. . .  [by JH0WJF]

5W Chinese PLL FM Transmitter With LCD Printed Circuit Board (PCB) -  Here's PLL FM transmitter circuit from china. This circuit uses the familiar 2SC1971 for final power amplifier stage. Click image below  for enlarge  the circuit schematic. . . .  [E-mail:sky @ cantonmade.com MSN:balalove2008 @ hotmail.com]

5W PLL FM Transmitter -  Easy to build high-quality PLL FM transmitter with typical output power of 5 W and no-tune design. . . 

5W PLL Stereo Transmitter with LCD -  Here's PLL FM transmitter circuit from china. This circuit uses the familiar 2SC1971 for final power amplifier stage. . . .  [E-mail:sky @ cantonmade.com MSN:balalove2008 @ hotmail.com]

5W QRP with KT907 -  Schematic only, no circuit description. . .  [ 2001 - YO5OFH, Csaba Gajdos]

6 Transistor Super Regen Receiver -  Solid State Superregenerative Receiver.   This is the only solid state super regen design with more than 20uV sensitivity on FM that I know of. . . .  [email designer: cablehack at yahoo dot com]

60W Linear Amplifier -  The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840. The IRF series of power transistors are available in various voltage and power ratings. A single IRF840 can handle maximum power output of 125 watts. Since these transistors are used in inverters and SMPS they are easily available for around Rs: 20/-. . .  [by Mohamed Agha]

7MHz CW/AM QRP Transmitter -  This circuit can be used for either amplitude modulation (AM) or CW operation at 7 MHz by simply keeping a switch on or off for choosing any one between them. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved]

7MHz QRP Transmitter -  This was one of my very first transceiver developments. This page was also one of the very first circuit descriptions that I put on the internet quite some years ago. Today I would not build a transceiver like I did then, but it was working, so I have kept this page for historical (and sentimental) reasons. If you are a beginner in building you own transceivers you might be able to steal a few of my ideas. Please let me know if you do a full copy of the design, I would be interested in you practical experiences when operation on the air. . . .  [Herbert Dingfelder's web site]

8 Channel RF Remote Control -  This is an 8 Channel RF Remote Transmitter and Receiver that will allow to remotely control various electronic projects. RF Remote Control provides 2 latched and 6 momentary outputs that could be used to control your favorite devices such as amplifier, robotic devices, RC cars, computer, home appliances, lamps and many other cool gadgets. . . . 

80 Meter DSB Transmitter -  amateur radio construction projects. . . .  [from Peter Parker's website]

80 Metre CW beacon / transmitter -  The local Homebrew Group has been talking about Peter Parker VK3YE's Carnegie Communicator project in Lo-Key. The general design of the circuit (based on the old "Oner" CW transceiver) lead in the usual round-about way to build this CW beacon. OK, so how does a top-band AM transceiver lead to a Morse beacon? Well, inspiration is a complex thing, and with the PSK beacon stuck in phase jitter hell, a CW beacon sounded like a good project to initially test the waters with. . . .  [ 2000 - 2009 Alan Yates]

80 Metre DSB Transmitter -  This circuit is probably the simplest practical 'bare-bones' voice transmitter for the 3.5 MHz amateur band. Unlike other simple transmitters, this one transmits DSB rather than AM. This makes it more compatible with SSB. Indeed, many SSB operators would not know that they're listening to a DSB signal if the signal is reasonably clean. . . .  [from Peter Parker's website]

80 Watt FM stereo transmitter -  A high quality broadcast transmitter big enough for a medium town!. . .  [Manfred Mornhinweg]

800 meter 2400ft range FM transmitter that fits on top of standard 9V battery -  . . .  [Collin Mitchell's web site]

807 & 1625 Valves -  data on vacuum tubes 807 and 1625 used in ham radio transmitters. Describes various pin voltages and different operation modes. . . . 

80m ceramic resonator VXO CW transmitter -  amateur radio construction projects - schematic only. . . .  [from Peter Parker's website]

80m hexfet power Amplifier -  Schematic only, no circuit description. . .  [by W7ZOI]

80m SSB & CW QRP superhet transceiver -  The 80m SSB & CW transceiver design is based on an already proven concept used in ATLAS amateur transistorised transceivers from 70's. The "two-mixer + 1 XTAL filter" design uses the 1st mixer as front-end mixer on receive as well as SSB modulator on transmit. The second mixer is used as SSB product detector on receive and as a heterodyne mixer on transmit. VFO and BFO are cross-switched between both mixers with a PIN diode matrix. Between 1st mixer's output and 2nd mixer's input a crystal filter is placed, followed by an AGC PIN attenuator. . .  [by Aleksander Stare]

88-108Mhz FM Radio Transmitter with 3 transistor stages -  This is a fairly basic radio transmitter circuit that is produced by a Project Kits company, Quasar. There are 3 stages in this version. But can be modified easily to output around 4W instead 500mW!. . . 

8W PLL Stereo Transmitter with LCD -  Very stable FM transmitter based on TSA5511 synthesizer. Frequency is performed with three buttons through PIC16F84 microcontroller. Frequency is displayed on 16x1 LCD. . . . 

98-108MHz FM audio transmitter -  . . .  [Peter Jakab, Electrical Engineer, Engineer of Informatics]

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Transmitter Circuits
Transmitters:  #'s       A-C       D-G       H-Q       R-T      

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