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Transmitter Circuits

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

Last Updated: November 21, 2017 05:44 AM

Circuits Designed by Dave Johnson, P.E. :
175Khz Inductive Pulse Transmitter -  This circuit is discussed in more detail in the Experimenters Journal.  The transmitterís six-inch diameter coil launches powerful magnetic 175KHz ring pulses that can be detected by the circuit below . . . Hobby Circuit designed by David Johnson P.E.-June, 2000

3Khz Filter + Audio Amplifier -  This circuit is the audio amp section for a complete optical transmitter.  The circuit amplifies and filters the voice audio signals from an electret microphone.  The circuit is described in more detail in . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

40khz TV-VCR Light Source Repeater -  This circuit is designed to be placed directly in front of a standard TV or VCR remote.  The exiting light pulses produced by the circuit match the pulses from the remote but are about 10 times more powerful.  Using the device, the remote can operate a TV or VCR over three times the normal distance. . . Circuit by David A. Johnson P.E.-June, 2000

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747

 


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

13.8V 30-40A Power Supply -  Schematic only, a powerfull power supply for my amateur radio equipment using four HEX FET transistors for regulation.  Text can be found at: http://www. Agurk.dk/bjarke/Projects/PowerSupplyFET/PowerSupplyFET.htm __ Designed by Bjarke Korsgaard

1300MHz-1500MHz transmitter with 20-50mW output power -  Schematic only, no circuit description__ 

137 Khz Big Coil antenna, over 1 square meter -  I like to use Atmel AVR Atmega PIC 16 PIC 16F876 PIC 16F84.  Most electronics easy made for the novice and something is for the more experienced.   __ Designed by Thomas Scherrer OZ2CPU

137 Khz CW transmitter -  I like to use Atmel AVR Atmega PIC 16 PIC 16F876 PIC 16F84.  Most electronics easy made for the novice and something is for the more experienced.   __ Designed by Thomas Scherrer OZ2CPU

13cm power Amplifier -  Schematic only, no circuit description __ Designed by © 2001 - YO5OFH, Csaba Gajdos

144.00 Mhz 1.5Watt CW transmitter -  The Xtal osc is riped from an old AT-PC running 16MHz, it requeres 5.0 volt and use 18mA
those Xtal oscilators is accurate and needs no adjustment
The 5.0Volt 7805 regulator can also be ripped from the same old PC, then this transmitter, can be created for no money at all!  The CW-Keying is done by turning the PA-stage on or off with a P-channel FET or a PNP transistor
The PA transistor (2N4427) gets a bit hot, this can be solved by incerting a resistor in the collector/powersupply, to reduse output to about 800mWatt.   __ Designed by Thomas Scherrer, oz2cpu

14MHz SSB 10mW Transceiver -  I wanted to QRV on 14MHz SSB mode.  One day when I walking on Akihabara city in Tokyo , while I have heard the sample transceiver on the ham shop , I have known that 14MHz can be used for domestic communication.  They made Japanese domestic QSO about 14.18MHz.   __ Designed by YO5OFH, Csaba Gajdos

15 watt FM transmitter -  This is a powerful FM transmitter with 5 RF stages for greater stability and trouble free operation.  The final output transistor is a Philips BLY 88 that delivers 15 Watts on the air.  Modulation is achieved by using a varicap diode in the first RF stage for even better results.  Like all of the high-power transmitter kits in this series, it comes pre-assembled and you only have to make the external connection __ Designed by QUASAR ELECTRONICS LIMITED

150mW FM Transmitter -  The circuit is identical to the V7 VHF FM Transmitter but with a few small additions.  TR1 (BC547) is an inverted Hartley oscillator which based upon an inductor fabricated on the PCB.  This makes it megga-stable, and setable.   __ Designed by Harry Lythall-SM0VPO

150W FM Transmitter Amplifier -  This is 150W FM transmitter amplifier for 88-108MHz band.  The amplifier has two stages using BLF244 MOSFET transistor for the first stage which requires 0.5 - 1Watt of RF input to get about 20watts to drive the final stage SD1407 which can push nearly 200 Watts on this design.  This design is more or less broadband however I added two variable capacitors after each stage for optimum matching and power output.  Make sure the trimmer and the capacitors after the final stage SD1407 are a high voltage types with at least 200V rating.  The power on this amplifier can be varied by adjusting the bias voltage using the white pot to the BLF244 MOSFET.  I added a zener diode onto the bias supply to protect the transistor from too much bias voltage.__ 

15dB UHF TV Antenna Booster -  This is an UHF band TV antenna preamplifier circuit With 15dB gain to build easily.  it is formed based on BF180 UHF Transistor.  The first stage is an band pass filter constructed by the C1, CV1, L1, L4, C7 and C3, the second stage is a base-common__ 

15W FM -transmitter -  Building a good fm-transmitter (88-110Mhz) begins with getting a good schematic.  You don't have to understand the precise working of the transmitter to build it.  But some basic information won't harm.  A transmitter alone is, as you probably know, is not __ Contact IQ Technologies

15W Transmitter Power Amplifier 88-108MHz -  The power amplifier boosts 88-108MHZ 1-2W FM transmitter's power to 15 W.  it includes multi-level low pass filter and has a high conversion efficiency with strong Yi-wave suppression.  With good antena expected transmission coverage is at least 15Km.  it uses high power 175 MHZ 4A 25W 2SC1972 RF transistor that must to be mounted to heatsink for proper heat dissipation.__ 

1750Hz & 82.5Hz PiLoTtone generator with PIC12 IC -  My Radio amateur callsign is OZ2CPU.  I like to use Atmel AVR Atmega PIC 16 PIC 16F876 PIC 16F84.  Most electronics easy made for the novice and something is for the more experienced.   __ Designed by Thomas Scherrer OZ2CPU

175Khz Inductive Pulse Transmitter -  This circuit is discussed in more detail in the Experimenters Journal.  The transmitterís six-inch diameter coil launches powerful magnetic 175KHz ring pulses that can be detected by the circuit below . . . Hobby Circuit designed by David Johnson P.E.-June, 2000

17M to 6M transveter -  This transverter is based on my 6M receive converter.  A 32MHz TTL oscillator is used as the local oscillator for both transmitting and receiving.  RX/TX switching is handled by three SPDT relays.  The first relay is used for switching the 18MHz input/output.  The second relay is used as the 50MHz antenna relay.  The third relay is used to switch the DC power supply.   __ Designed by EI9GQ homebrew radio

18 DB LT1253 DDS Amplifier -  This 18 dB gain amplifier was built Manhattan-style to evaluate the LT1253 dual video amplifier as a candidate output amplifier for DDS systems employing the Analog Devices AD9850 and similar devices.  This dual amplifier was chosen to take advantage of its high gain-bandwidth product.  By utilizing both amplifier sections, a very broadband (100 KHz to 30+ MHz) , high gain system could be built.   __ Designed by Jim Kortge, K8IQY

18W FM Transmitter -  Here's FM transmitter for commercial FM band that provides 18 watts of power.  Since the electronic diagram is too large we decided to divide it into two parts.  The first part is the actual FM transmitter while the second part is 18W RF amplifier.  The circuit should be built on an epoxy printed circuit board with the upper face components reserved for interconnecting tracks and the bottom solder to the ground plane.  if powered by 14V and 2.5A transmitter outputs 15W of power, whereas 18V and 3.5A will provide 18W.  BB110 variable capacitor connected to the collector of transistor BF199 adjusts the transmission frequency of the circuit.2K2 potentiometer serves as fine tuning.  Once the output frequency is adjusted amplifier variable capacitors must be adjusted for maximum output power one stage at a time.  All adjustments must be made with 50 Ohm dummy load connected to the output of transmitter.__ 

1GHZ Frequency Meter -  This is 1GHz frequency counter with 100KHz resolution.  Meter is built in around PIC 16F84A microcontroller and SAB6456 / U813BS prescaller __  Jan Kolar

1KM Power FM Transmitter -  This small power FM transmitter can transmit more than 1 km in good conditions.  The modulation can be made so much with a microphone or audio source.  Circuit of power fm transmitter is built around 2n2218 transistor.  Transmitter coil is 5 turns of enameled 22 AWG wire, with diameter of 1 cm without nucleus.  Look at the capacitors that it should be ceramic.  The antenna should possess from 15 to 40 cm.  For transmission it ties a receiver of FM (radio) in the proximity to half volume in a free frequency (that there is not any radio operating) , with a wood or plastic key, rotate the screw of CV to capture the frequency of the transmitter.__ 

1-transistor FM Transmitter -  A truly minimalist circuit.  Performance is relatively poor and stability is a problem.  Q1 modulates the signal and acts as an oscillator.  L1 and C5 determine the frequency.  Decrease C5 for a higher frequency and vice-versa.  __ 

1W 10GHz Power Amplifier -  We briefly describe here the 2-stages PA built to increase the power of the homebuilt transverter without impacting its originally compact design.    __ Designed by Andrea  IW9HJV and Johnny  IW9ARO

1W FM Transmitter -  A very good 1 watt fm transmitter circuit, very easy to build circuit.  it has 4 transistors, one is a very stable oscillator, followed by a buffer stage to prevent frequency variation when you adjust the transmitter.  Next is a resonance stage and the final stage built with a minimum 1W transistor which must have a heatsink.  You must use a LM7805 stabilizer for the oscillator diodes and one LM7809 for powering up the T1 oscillator stage.  This will give you a very stable transmitter frequency.__ 

1W HF QRP -  Schematic only, no circuit description __ Designed by © 2001 - YO5OFH, Csaba Gajdos

1W Linear FM Booster -  This RF Amplifier is used for boosting small fm transmiters and bugs.  it use two Philips 2N4427 and its power is about 1Watt.  At the output you can drive any linear with BGY133 or BLY87 and so on.  its power supply has to give 500mA current at 12 Volts.  More voltage can boost the distance but the transistors will be burned much earlier than usual.  !  in any case do not exceed the 15Volts.  The Amp offers 15 dB in the area of 80Mhz to 110 Mhz.  L4, L5, and L6 are 5mm diameter air coils, 8 turns, with wire 1mm wire diameter.  An easy project, with great results__ 

1W Linear FM Transmitter Booster with 2N4427 -  Here's 1W RF Amplifier is for boosting small fm transmitters and bugs.  it use two Philips 2N4427 and its power is about 1Watt.  At the output you can drive any linear with BGY133 or BLY87 and so on.  its power supply has to give 500mA current at 12 Volts.  More voltage can boost the distance but the transistors will be burned much earlier than usual.!  in any case do not exceed the 15Volts.  The Amp offers 15 dB in the area of 80Mhz to 110 Mhz.  L4, L5, and L6 are 5mm diameter air coils, 8 turns, with wire 1mm wire diameter. An easy project, with great results.__ 

1W Long Range FM Transmitter -  Long range, very stable, harmonic free, FM transmitter circuit which can be used for FM frequencies between 88 and 108 MHz.  With good antenna transmitter can cover 5km range.  it has a very stable oscillator because it uses LM7809 voltage regulator which is a 9V stabilized power supply for T1 transistor.  Frequency adjustment is achieved by using the 10K linear potentiometer.  The output power of this long range RF transmitter is around 1W but can be higher if you use transistors like KT920A, BLX65, BLY81, 2N3553, 2SC1970 or 2SC1971.__ 

1W PLL FM Transmitter -  The VERONIC A 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__ 

1W PLL Transmitter with MC145152 -  Following 1W PLL transmitter exciter provides stable, low noise operation.  Transmitter uses a PLL frequency synthesizer built with MC145152 which covers the FM band in 100kHz steps.  The VCO uses MV2109 varicap diode to automatically tune to selected frequency via SW1 dip switch.  output stage uses 2N4417 RF power transistor and provides 1W of RF power.  With good antenna expected transmission range is 2km.  Transmitter may be built on a double sided PCB, with top side copper left mostly undisturbed as a ground plane.  The copper is removed only around non-grounded pins.  The ground connections can be soldered on the top side, so itís not necessary to have plated-through holes.__ 

1W Portable PLL transmitter -  This small FM transmitter includes a limiter, a microphone amplifier and a PLL digital tuning.  All the parts are placed on one circuit board.  The RF power is switchable between 1W and 0, 2W __  Jan Kolar

1W RF Power Amplifier for iPOD Stereo FM transmitters -  This project explain how you can build and connect a powerful 1W amplifier to your FM transmitters.  A perfect solution for those wishing to listen to their favorite tunes in the car, house, garden, school, campus, party, you name it.  Why not share your music with every one else in your city! __ 

1W-5W 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__ 

1Watt AM CW Transmitter for 10 Meterband -  in this project, you will make a simple 3-stage low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator with amplifier.  You can connect the circuit to the an electred microphone or amplified dynamic microphone.  Using an electred microphone is shown (in gray) in the diagram below. (no amplified dynamic microphone has a to low output voltage to work.  at least 100mv is needed).  You could also add a LF preamp stage of one transistor to allow connecting a dynamic microphone directly.  You'll see that you can receive the signal through the air with almost any AM radio receiver.__ 

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


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