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Transceiver Circuits
Transceivers:  #'s - G         H - Z 
 

Last Updated: October 24, 2017 02:55 PM


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

HeNe Laser Transmitter/Receiver -  This set of two circuits from the basis for a very simple light wave transmitter.  A LASER beam is modulated and then aimed at a receiver that demodulates the signal and then presents the information (voice, data, etc).  The whole thing is very easy to build and requires no specialized parts execpt for the LASER itself.  LASERs are available from MWK industries.   __ Designed by Aaron Cake

HF TRANSCEIVER -  This page will describe the construction of a multI band SSB transceiver.  Because I do 99% of my operating on my four favourite bands, I decided to build a four band rig with provision for adding a fifth band later.  The design can be used on any band from 160M to 10M.  Mine covers 80M, 40M, 17M, 10M.   __ Designed by EI9GQ homebrew radio

High Efficiency Adaptable Power Supply for XENPAK 10Gb/S Ethernet Transceivers -  DN295 Design Notes__ Linear Technology/Analog Devices

Home Brew a 4 to 1 Balun -  With out a balun the transceiver can only feed an antenna which uses coaxial cable.  While this may be __ Designed by Radio Amateur Society of Norwich

Improving the Accuracy of Optical Transceiver Extinction Ratio Measurements-AN 1550-9 -  Application Note__ Aligent

IR transceiver 1.0 -  iR transceiver enable to increase range of PDA IR port up to 15 meters (50 feet). __ Contact IQ Technologies

Isolated MOSFET driver has wide duty-cycle range -  29-Apr-04 EDN Design Ideas:  The main application for the circuit in Figure 1 is for driving power MOSFETs with signals ranging in frequency from 1 Hz to 300 kHz and with duty cycles from 0 to 100%.  You achieve this goal by using a coreless pc-board transformer.  The switching frequency in most power-electronics circuits ranges from a few hertz to a few hundred kilohertz __ Circuit Design by Jesus Doval-Gandoy and Moises Pereira Martinez, ETSI Industriales, Vigo, Spain

Isolated RS485 Transceiver Breaks Ground Loops -  DN228 Design Notes__ Linear Technology/Analog Devices

Laser transmitter/receiver -  This set of two circuits from the basis for a very simple light wave transmitter.  A LASER beam is modulated and then aimed at a receiver that demodulates the signal and then presents the information (voice, data, etc).  The whole thing is very easy to build and requires no specialized parts execpt for the LASER itself.  LASERs are available from MWK industries.   __ Designed by Aaron Cake

LED battery voltage Monitor -  A fuel gage for your gel cell battery.   __ Designed by Steven Weber, KD1JV

Lego Mindstoms IR Link PIC transceiver -  I just finished a half duplex serial asynchronous link from a simple PIC  circuit to the RCX.  it is able to receive codes from the RCX (or Lego RCX remote control) store them in RAM & EEPROM and transmit any IR op-code to the RCX in turn.  included in the firmware is a routine that takes any opcode (s) and expand it to the proper IR packet for transmission to the RCX.  I'veused the UiRT circuit with a few modifications for the hardware.  The UiRT includes a serial port programmer for the PIC 16F84A so you won't need a separate programmer.  Here's the website where you can find the programmer.  Here are the modifications to get the UiRT to work with the RCX.   __ Designed by Lloyd Gordon

Local Oscillator -  The local oscillator is based on the Franklin oscillator, that was so popular in the first half of this century.  The Franklin circuit used two vacuum tubes, this circuit uses two direct coupled FET's.  The inductor L1 is wound on a ceramic former, about 1/2 inch (12.5mm) Dia.  You can make a ceramic coil former from an old 1KW electric fire (heater) element.  Nick the element with a hacksaw, and break it on a hard surface __ Designed by EI9GQ homebrew radio

Low Power CMOS RS485 Transceiver -  DN39 Design Notes__ Linear Technology/Analog Devices

LTC1387: 5V RS-232/RS485 Multiprotocol Transceiver -  DN176 Design Notes__ Linear Technology/Analog Devices

Mains Remote Alert -  Beeper and/or LED remotely-operated via mains supply line; Simple circuitry, easy to build units __ Contact Flavio Dellepiane, fladello @ tin.it

Microphone Amplifier and LPF -  The USB/LSB carrier oscillators are fairly conventional, common collector Colpitts oscillators.  I used BC548 transistors, not because they are particularly well suited to the job, but because I had a few of them in my junk box.  The crystal frequencies are chosen to match the SSB filter in your rig (7.7985/7.8015 MHz in my rig.)  __ Designed by EI9GQ homebrew radio

MMR-40 40 meter rig with SSB (voice) & CW (Morse code) operating Modes. -  A 40 meter CW/SSB transceiver using less than $50.00 in parts.  How to build "dead bug" style.   __ Designed by Steven Weber, KD1JV

MOSFET PA for SSB Tranceiver -  30 Watt PA __ Designed by EI9GQ homebrew radio

MOSFET PowerAmp -  DiY high power MOSFET amplifier200 Wrms 8 ohms -350 Wrms4 ohms __ Designed by Edwin Paij

Multi-Band HF Direct Conversion Transceiver -  This project is a work in-progress.  it was originally going to be only a single band transceiver, hence the single vco.  But somewhere along the way I decided to make it multI band (80/40/20) and add a pll synthesizer __ Designed by John Price VK3AJG

One FET controls LED array -  04/12/01 EDN Design Ideas:  White-LED backlights are gaining acceptance because they offer higher reliability and simpler drive circuitry than backlights based on CCFL (cold-cathode-fluorescent-lamp] and EL (electroluminescent] technology.  As a result, white-LED backlights are increasingly common in PDAs (personal digital assistants], cell phones, digital cameras, and other portable devices.  A design __ Circuit Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA

Passive filters fill the bill at audio frequencies -  02/01/01 EDN Design Ideas:  Low-frequency filters, particularly at audio frequencies, usually take the form of active filters.  These filters eliminate expensive inductors with windings of many turns.  Both analog and digital active filters are most compatible with large-scale integration at the subsystem and system levels.   __ Circuit Design by Richard Kurzrok, Queens Village, NY

Post Mixer Amp -  SSB Transceiver-Receiver Section:  The post mixer amplifier, makes up for the losses in the passive mixer and i.F.  port attenuator.  The transistor is a 2N4427, if you don't have one, try a 2N3866, 2N5109, on any similar, medium power VHF transistor.  The output transformer is 10 turns with a tap at 4 turns.  The core is the same, high permeability ferrite ring, used in other parts of this project.  The output supplies DC current for the RX/TX switching diodes at the SSB filter input __ Designed by EI9GQ homebrew radio

PSK Transceiver, version 2 -  Unique non-SSB transmitter design - kinda works.   __ Designed by Steven Weber, KD1JV

Remote Alert -  Beeper and/or LED remotely-operated via mains supply line; Simple circuitry, easy to build units __ Contact Flavio Dellepiane, fladello @ tin.it

RS-232 Laser Transceiver -  Laser based projects used to be expensive, until the development of solid state lasers.  This project is designed for the entry level laser experimenter.  The circuit allows any two computers with serial (RS-232) communication capability to communicate over 200 meters using a laser beam.  A low cost transmitter only circuit is also presented here for use in one way communication and other laser based projects __ Designed by shaunwilson19 @ yahoo.com

RS-232 Transceiver with Automatic Power Shutdown Control -  DN30 Design Notes__ Linear Technology/Analog Devices

RS-232 Transceivers for Hand Held Computers Withstand 10kv Esd -  DN64 Design Notes__ Linear Technology/Analog Devices

RS485 Transceivers Operate at 52Mbps over 100 Feet of Unshielded Twisted Pair -  DN168 Design Notes__ Linear Technology/Analog Devices

RS485 Transceivers Reduce Power & EMI -  DN102 Design Notes__ Linear Technology/Analog Devices

RS485 Transceivers Sustain ±60V Faults -  DN203 Design Notes__ Linear Technology/Analog Devices

Rx I.F. and Product Detector -  SSB Transceiver-Receiver Section:  Two silicon switching diodes are used for receive/transmit switching of the input side of the SSB filter.  The iF amp is an MC1350P.  This device can give more than 60dB of gain at 7.8Mhz.  I decided to use a single iF amplifier stage, followed by a relatively high gain AF amp (60dB +).  The output transformer is a KANK3334R, with a 100pf capacitor and 5K6 resistor across the primary. __ Designed by EI9GQ homebrew radio

Simple Circuit 40 meters CW QRP Transceiver -  This project describes a little QRP transceiver “full legal power” (5 W at 12 V) for the 40 meters band.  The RiG may be built in a gradual manner, in fact it is divided in two main modules, or you may also complete only the RX module __ Designed by Francesco Morgantini IK3OIL

Simple Circuit 80 Metre DSB Transceiver -  The receiver is quite sensitive and tunes about 80-90Khz,  tx output is ~300-500mW __ Designed by John Price VK3AJG

Single FET controls LED array -  04/12/01 EDN Design Ideas:  White-LED backlights are gaining acceptance because they offer higher reliability and simpler drive circuitry than backlights based on CCFL (cold-cathode-fluorescent-lamp] and EL (electroluminescent] technology.  As a result, white-LED backlights are increasingly common in PDAs (personal digital assistants], cell phones, digital cameras, and other portable devices.  A design __ Circuit Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA

SSB Tramsceiver, Exciter Board -  Now that people are getting married, and having babies on the internet, isn't it about time someone designed and built an SSB rig on the net?.  The rig will be built up from various modules, starting with the SSB exciter board.  The first prototype board has been built and tested on the bench but not on air.  The resulting SSB signal looks good on the scope, and sounds ok on a monitor receiver. __ Designed by EI9GQ homebrew radio

SSB Transceiver, Transmitter Section -  For the transmit mixer, I used a simple single ended JFET mixer.  The FET is a J113.  The inductors are TOKO KANK3334.  You can wind your own on TOKO, or similar formers PRI = 18T SEC = 3T.   The transformer at the output of the first stage is 6 Turns, bifilar wound on a ferrite toroid, of the same type used for the RX mixer.  I used 2N4427's for both stages.  The 2N3866 or 2N5109 should also be suitable.  Gain is about 30dB, more than enough to bring the 1mW, from the TX mixer, up to several hundred mW.  Use a heat sink on both transistors. __ Designed by EI9GQ homebrew radio

SSB1 -  (Fairly) Simple 75M SSB rig  __ Designed by Steven Weber, KD1JV

SWR meter for 1 to 1300 MHz -  A very simple design, cheap to built, does not require adjustment and works well!  Depending on specific components and construction technique used, the upper frequency limit will be somewhere between 150MHz and 5GHz!  __ Designed by Manfred Mornhinweg

SWRX -  Short Wave AM Broadcast Receiver.  Simple, inexpensive and effective.   __ Designed by Steven Weber, KD1JV

The ADC-40 -  All Discrete Components 40 M transceiver with super-het receiver using no IC 's, just a whole bunch of transistors of various flavors (NPN, PNP, J-FET, MOSFET)  __ Designed by Steven Weber, KD1JV

The BC547 80M SSB QRP Transceiver -  This is a bit of a retro design, and uses easily obtained parts, no hard to find or expensive IC 's (no IC 's at all)  __ Designed by John Price VK3AJG

The Tenna Dipper -  Poor mans antenna analyzer, shows resonance of antennas, 80-10 M operation.   __ Designed by Steven Weber, KD1JV

Transceiver to PC soundblaster interface for digital operating Modes (PSK-31, RTTY, SSTV etc) -  All three interfaces presented on this page employ galvanic isolation of the transceiver from PC computer.  Audio paths are separated by transformers, optocouplers serve to separate the digital paths (PTT and RTTY keying). __ Designed by Aleksander Stare

Understanding GSM Transmitter Measurements -  Application Note__ Aligent

USB/LSB Carrier Oscillators -  The USB/LSB carrier oscillators are fairly conventional, common collector Colpitts oscillators.  I used BC548 transistors, not because they are particularly well suited to the job, but because I had a few of them in my junk box.  The crystal frequencies are chosen to match the SSB filter in your rig (7.7985/7.8015 MHz in my rig.)  __ Designed by EI9GQ homebrew radio

Using an AVR -  LED headlamp projects: Tiny13V microcontroller as step up (boost) or step down (buck) voltage converter for driving a white or high power LED. (pdf file) Design equations and source code included.   __ Designed by Steven Weber, KD1JV

Using the TP3401/2/3 ISDN PBX Transceivers -  Application Note __ National Semiconductor

Variable Power Supply with adjustable current limiting -  A Variable power supply with adjustable current limiting - new design!  0-14V output up to 5A current.   __ Designed by Steven Weber, KD1JV

Yaesu FT-897, FT-857 & 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)  __ Designed by Bjarke Korsgaard   

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Transceivers:  #'s - G         H - Z 

 


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