|
1 Valve CW Transmitter - (electronic circuit added 7/03) |
|
1.5V Battery operated FM rebroADCast transmitter - This implementation is adapted
to rebroadcast the output of a CD player, television receiver, or radio receiver. I
use it so that I can move about the house and listen to my favorite programs without
disturbing others. Within and the house...(added 08/08/08) |
| 1.5V Tracking Transmitter (with Video Clip) - The
current draw for this tracker is 3.7mA, so the 1.5V button cell will last awhile. What
the heck am I suppose to hear you ask? When your circuit is working you should see the
LED flash quite fast. Take your FM radio and search for the low-beat 'humbe-humbe-humbe-etc'
equal to the flash of the LED (Tony van Roon's probably around the 100Mhz). Found it?
If that position is interferering with a radio station ....(Tony van Roon's circuit
added 4/02) |
| 1.5V Tracking Transmitter (with Video Clip) - The
current draw for this tracker is 3.7mA, so the 1.5V button cell will last awhile. What
the heck am I suppose to hear you ask? When your circuit is working you should see the
LED flash quite fast. Take your FM radio and search for the low-beat 'humbe-humbe-humbe-etc'
equal to the flash of the LED (Tony van Roon's probably around the 100Mhz). Found it?
If that position is interferering with a radio station ....(Tony van Roon's circuit
added 4/02) |
|
10W HF Linear Amplifier - (electronic circuit added 7/03) |
|
14MHz SSB 10mW Transceiver - (electronic circuit added 05/07) |
|
150mW FM Transmitter - (circuit / schematic design added 6/06) |
|
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 ....(electronic design added 08/08/08) |
|
175kHz Inductive Pulse Transmitter - This circuit is discussed in more detail in
the Experimenters Journal. The transmitter’s six inch diameter coil launches powerful
magnetic 175KHz ring pulses that can be detected by the circuit below. ….(designed by
David A. Johnson) |
|
1-transistor FM Transmitter - A truly minimalist circuit. Performance is
relatively poor and stability is a problem. Q1 modulates signal and acts as an
oscillator. L1 and C5 determine frequency. Decrease C5 for a higher frequency
and vice-versa. You won't get a long range transmission with this one.....(added
10/05) |
|
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. (electronic circuit added 6/07) |
|
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…(electronic
design added 03/08) |
|
2 channel RF remote control - This RF remote control it runs at 418MHz frequency
and support up to 2 channels. It is very safety as the transmiting code is changing
every time you push any button (roll-code function)….(electronic schematic added
03/09) |
|
2 Meter Transmitter - This project is a simple transmitter using only one crystal
and will cover 145.00 to 146.00 MHz. The crystal is a 44.9333 MHz crystal for 145.500
receive, as used in the Trio (Kenwood) 2200, PYE, Motorola, Tait equipment, to name
but four. The frequency of the crystal is not critical as almost any other Xtal for
the 2-meter band will function added 7/03) |
|
2 Transistor FM Transmitters (Bill Bowden) - (circuit / schematic design added
6/06) |
|
2 Transistor LED Flasher (Bill Bowden) - This circuit will flash a bright LED (500
mcd) as an attention getting device or fack car alarm. Component values are not
cirtical and other transistors may be…...(circuit / schematic design added 6/06) |
|
2 Valve 40m CW Transmitter - (electronic design / schematic added 2/05) |
|
2 Valve CW Transmitter - (electronic circuit added 7/03) |
|
2.x GHz WiMAX Direct Conversion Transmitter - AN-826 Analog Devices Application
Notes (app note added 6/06) |
|
250mW HF CW Transmitter - (electronic circuit added 7/03) |
|
27MHz AM/CW Transmitter - (electronic circuit added 7/03) |
|
27MHz toy car receiver - (circuit / schematic design added 6/06) |
|
27MHz Transmitters - n 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....(electronic schematic added 04/09) |
|
2N2222 40 Meter CW/DSB Transceiver - (electronic schematic / circuit added 4/02) |
|
2-transistor FM Transmitter - While re are a plethora of similar 2-transistor
schematics available, this one is above average. A major improvement over little
1-transistor circuit that we've discussed previously, this transmitter consist of two
stages. first transistor is used to amplify audio,....(added 10/05) |
|
3 Channel IR Remote Control - This project is a 3-channel IR remote control with 3
output relay and easy to build. Features: CPU PIC12F629 at 4MHz crystal for Tx/Rx, 3
channel output relay, The Tx use sleep mode for saving battery power, Use Phillips RC5
protocol, distance more than 7 m, Easy circuit to build and assembly and small amount
of components. Uses RC5 protocol which is probably the most used by hobbyists,
probably because the wide availability of cheap remote controls and easy to
understand. ….(electronic schematic added 11/08) |
|
3 Channel RF Remote Control - This is a 3 channel RF remote control project.The
transmitter powered by 3V battery(coin size) range about 10 m. This remote control I
use PIC12F509 from Microchip which is a 8-pin single-chip microcontroller designed for
low pin count applications with 1 K words flash memory and 41Byte SRAM and some
special features such Power-saving Sleep mode,Wake-up from Sleep on pin change.
….(electronic schematic added 11/08) |
|
30 Meter QRP Transmitter for Morse Code - (Tony van Roon's electronic schematic /
circuit added 4/02) |
303MHz TRANSMITTER with 32kHz Crystal - We have covered 27MHz (and 49MHz) links on
P1 and P2 of this article and shown how to produce a simple circuit (or buy a toy for
less than $10.00) and get 4 or 5 channels.
We also showed how to produce on/off from a single channel and how to detect 27MHz
with a Field Strength Meter.....(electronic circuit added 08/08) |
|
30m direct conversion receiver - This simple receiver was originally intended to
check the transmission of my 30m QRSS beacon. By tuning the 30m receiver to Russia's
RWM timesignal on exactly 9996kHz I was able to calibrate my frequency counter, which
I could then use to measure the output of the QRSS beacon and adjust the reading for a
very high precision. Later, I modified my 1-valve ECL82 CW transmitter for 30m
operation and enjoyed several QSO's on 30m CW. (electronic circuit added 08/08) |
|
3m 100 MHz small bug - (circuit added 05/06/07) |
|
3W FM Transmitter - This is the schematic for an FM transmitter with 3 to 3.5 W
output power that can be used between 90 and 110 MHz. Although the stability isn't so
bad, a PLL can be used on this circuit. This is a circuit that I've build a few years
ago for a friend, who used it in combination with the BLY88 amplifier to obtain 20 W
output power. From the notes that I made at the original schematic, it worked fine
with a SWR of 1 : 1.05 (quite normal at my place with my antenna). (electronic circuit
added 08/08) |
|
3W HF QRP Linear Amplifier - (electronic circuit added 7/03) |
|
4 Transistor Transmitter - (schematic added 8/03) |
|
400mW VCO FM transmitter - With good antenna (dipole placed outdoor and high) the
transmitter has very good coverage range about 500 meters, the maximal coverage range
is up to 4 km. (electronic circuit added 6/07) |
|
4-20 mA Digital-to-Process Current Transmitter - AN-21 Analog Devices Application
Notes (app note added 6/06) Describes a 3 I.C. Digital to 4-20 mA Current Output
Circuit (DAC08, REF01 and OP221) |
|
433MHz transmitter using SAW resonator - (electronic design added 02/03/04) |
|
434MHz short-range communications - article from Elektor 1998/5….(added 04/09) |
|
4-transistor transmitter - (Tony van Roon's electronic circuit added 05/07) |
|
4-transistor transmitter - (Tony van Roon's electronic circuit added 05/07) |
|
4W FM Transmitter - Don't be fooled by relative simplicity of this
transmitter. With 4W of power, it's not a toy! Since it operates in FM band
(88-108MHz), a license is required for broadcasting. With a good and properly mounted
antenna this baby has a range of up to 50km. In mountainous terrain or in built-up
areas, this figure is smaller, of course. circuit is fairly small.….
(added 11/05) |
|
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. ….(electronic schematic added 11/08) |
|
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...)schematic added 8/03) |
|
5 Watt FM Transmitter with Antenna 88-108 MHz - Two stages -- AUDIO AMPLIFIER AND
OSCILLATOR and RF POWER AMPLIFIER (electronic schematic / circuit added 11/05) |
|
5 Watt HF CW transmitter - (schematic added 03/04/05) |
|
5 Watt Transmitter - (electronic circuit added 7/03) |
|
500mW HF Linear Amplifier - (electronic circuit added 7/03) |
|
5W PLL FM Transmitter - Easy to build high-quality PLL FM transmitter with typical
output power of 5 W and no-tune design….(added 08/08/08) |
|
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. …(electronic
circuit added 08/08/08) |
|
60W Linear amplifier - This is a RF Linear amplifier for QRO using power mosfet
IRF840 with power out 60 Watts. It's simple all solid state circuit. The IRF series of
power transistors….(circuit / schematic added 09/08) |
|
7MHz QRP transmitter - (circuit design added 04/05/06) |
|
7MHz QRP Transmitter - (electronic circuit added 7/03) |
|
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. ….(electronic schematic added 11/08) |
|
80 Meter DSB Transmitter - (circuit / schematic design added 6/06) |
|
800 meter 2400ft range FM transmitter that fits on top of standard 9V battery -
(circuit added 05/07) |
|
807 and 1625 Valves - data on vacuum tubes 807) and 1625 used in ham radio
transmitters. Describes various pin voltages and different operation modes. . (added
9/04) |
|
98-108MHz FM audio transmitter - ….(electronic schematic added 04/09) |
|
A 2.x GHz WiMAX Direct Conversion Transmitter - AN-826 Analog Devices Application
Notes (app note added 6/06) |
|
A 3m 100 MHz small bug - (circuit added 04/05/06) |
|
A Basic RF Transmitter for PIR Sensors - (circuit / schematic added 6/05) |
|
A Simple FM Stereo Transmitter - (circuit added 6/07) |
|
A small FM transmitter (SMD) - (electronic design added 6/07) |
|
Achieve simple IR data transmission from a PC’s serial port - 10/11/07 EDN-Design
Ideas: By transmitting appropriate hex values from a PC's serial port to a pair
of IR LEDs, a remote-control IR receiver can enable 38.4-kHz data
transmission.....(design idea added 11/07) |
|
AM DSB Transmitter for Hams - circuit diagram of simple double side band
suppressed carrier (DSBSC) transmitter for hams. Circuit uses crystal oscillator,
crystal can be switched for multi band operation. . (added 9/04) |
|
AM FM Simultaneous Transmitter Using Digital IC - (electronic design idea added
09/08) |
|
AM Transmitter (Andy Collinson) - The circuit is in two halfs, an audio amplifier
and an RF oscillator. The oscillator is built around Q1 and associated components. The
tank circuit L1 and VC1 is tunable from about 500kHz to 1600KHz... (circuit /
schematic design added 6/06) |
|
AN-146: FM Remote Speaker System - National Semiconductor Application Note
(app note added 07/08/09) |
|
AN-21: 4-20 mA Digital-to-Process Current Transmitter - AN-21 Analog Devices
Application Notes (app note added 6/06) Describes a 3 I.C. Digital to 4-20 mA
Current Output Circuit (DAC08, REF01 and OP221) |
|
AN232: Low Frequency Magnetic Transmitter Design - Microchip Application Note
Published 14-Oct-02 (app note added 2/06) |
|
AN242: Designing an FCC Approved ASK RFPIC™ Transmitter - Microchip Application
Note Published 2-Jan-03 (app note added 6/06) |
|
AN-543 - Monaural FM Transmitter DSP, 20,641 bytes -
AN-543-MonauralFMTransmitter-Analog Device Application Notes (app note added
6/06) |
|
AN-543 - Stereo FM Transmitter DSP, 26,085 bytes -
AN-543-StereoFMTransmitter-Analog Device Application Notes (app note added 6/06)
|
|
AN-654: Optical Module Development Platform 2.5 GBPS Transmitter with Digital
Diagnostics - AN-654 Analog Devices Application Notes (app note added 6/06) |
|
AN-673: 2-Way Multiplexed LCD Drive and Low Cost A/D-Converter using V/F Techniques
with COP8 Microcontrollers - National Semiconductor Application Note (app
note added 6/06) |
|
AN-826: A 2.x GHz WiMAX Direct Conversion Transmitter - AN-826 Analog Devices
Application Notes (app note added 6/06) |
|
Antennas for HAM Transmitters - Describes how to construct various type of antenna
for Ham Radio Transmitters. (added 9/04). |
|
ATV Repeater Controllers - (electronic schematic / circuit added 4/02) |
|
Automatic message sender for CB - (circuit added 6/07) |
|
Automatic Repeater - This circuit will be of interest to radio amateur and
anyone possessing two radios, (one of which must be able to transmit i.e. a
transceiver). It is a self powered (audio derived) repeater circuit for receiving a
signal and re-transmitting it via or radio. (added 10/05) |
|
Automicro TM02 high power transmitter module schematic - ….(electronic schematic
added 04/09) |
|
Basic RF Oscillator #1 - This basic circuit is eash to build and the components
are not critical. Most of them can be found in your junk parts box….(Tony
van Roon's electronic schematic / circuit added 4/02) |
|
Beeper bug transmitter for fox hunt and vehicle tracking - (diagram added 05/07) |
|
BH1417 Stereo PLL FM Transmitter - The new FM Stereo Micromitter is now
crystal-locked which means that the unit does not drift off frequency over time. In
addition, the distortion, stereo separation, signal-to-noise ratio and stereo locking
are much improved on this new unit compared to the earlier designs. The specifications
panel has further details. (electronic circuit added 6/07) |
|
Car Anti-Theft Wireless Alarm - This FM radio-controlled antift alarm can be used
with any vehicle having 6to 12-volt DC supply system. The mini VHF, FM transmitter is
fitted in vehicle at night when it is parked in car porch or car park. The
receiver unit with CXA1019, a single IC-based FM radio module, which is freely
available in market at reasonable rate,..... (added 10/05) |
|
CB Transmitter - For the regulation it needs a voltmeter (with needle better) and
charge 50W/5W. Connect charge 50W in the place of aerial, with the voltmeter in the
exit voltmeter. Be supplied the transmitter with + 12V. It will be supposed we have
consumption between 0,7-1A. With a screwdriver we regulate the core of inductor L1/L2
and later the variable C6 until we see the biggest tendency. We connect the microphone
and speaking we observe the clue in the multimeter. If all have become right will be
supposed the tendency, speaking, to go up roughly 30-35%. |
|
Ceramic Filter BFO - Receive SSB and CW transmissions on your BC receiver. Simple
BFO is build around 455 KHz Ceramic Filter. . (added 9/04) |
|
Characterizing High-Speed Optical Transmitters: Compliance Testing with the Agilent
86100A Infiniium DCA - Aligent Application Note (added 04/05/06) |
|
Circuit Transmits Arinc 429 Data - 07/11/02 EDN-Design Ideas: The ARINC
(Aeronautical Radio Inc)429 specification defines the air transport industry's
hardware and protocol standards for the transfer of digital data between avionics
systems. Circuitry that can implement elements of the 429 spec is often an essential
part of control and sensor electronics intended for the aviation
environment.....(design idea added 1/05) |
|
Ck-3V FM Transmitter - Circuit design (added 02/05) |
|
Coilless FM transmitter! - (electronic circuit added 10/05) |
|
Combination-Controlled fully customizable RF remote Control - (electronic Circuit
added 03/06) |
|
Crystal Controlled FM Transmitter - (electronic circuit added 7/03) |
|
Crystal radio - (circuit added 6/07) |
| DIY
remote control based on PIC - Control up to 8 devices by this easy constructable
remote control. It can work as a radio or infrared remote control, depending on the
components. Each device output can be configured to be momentary (turned on while you
press the button) or latched. Latched outputs can be toggled on/off by one button per
channel, or turned on and off by two buttons per channel….(circuit / schematic design
added 6/06) |
|
DTMF Radio Remote Control - Here is a circuit of a remote control unit which makes
use of the radio frequency signals to control various electrical appliances. This
remote control unit has 4 channels which can be easily extended to 12.
(electronic circuit added 6/07) |
|
Easy 2 Meter Transmitter - This project is a simple transmitter using only one
crystal and will cover 145.00 to 146.00 MHz. The crystal is a 44.9333 MHz crystal for
145.500 receive, as used in the Trio (Kenwood) 2200, PYE, Motorola, Tait equipment, to
name but four. The frequency of the crystal is not critical as almost any other Xtal
for the 2-meter band will function added 7/03) |
|
Filter simplifies software defined radio - 12/03/07 EDN-Design Ideas: A
Linear Technology LTC1992 filter replaces four op amps in the signal chain of a
software-defined radio. |
|
FM / AM Regenerative Receiver - Two transistor receiver. (circuit added
08/07/06) |
|
FM Band Monaural Transmitter - (circuit design added 8/03) |
|
FM Band PreAmplifier - (circuit / schematic design added 6/06) |
|
FM Beacon Transmitter 88 108 MHz - This circuit will transmit a continuous audio
tone on the FM broadcast band (88-108 MHz) which could used for remote control or
security purposes. Circuit draws about30 mA from a 6-9 volt battery and can be
received to about100 yards. |
|
FM Booster - (electronic Circuit / Schematic added 10/04) |
|
FM BroADCast Audio Transmitter - (schematic / circuit added 6/07) |
|
FM Bug - transmitter - The circuit consists of two separate stages. The first is
an audio pre-amplifier and the second is a 90MHz oscillator. The first stage is very
simple to explain. It is a self-biasing common-emitter amplifier capable of amplifying
minute signals picked up by the electret microphone....(electronic circuit added
04/09) |
|
FM Bug 1.859.telia - (electronic circuit added 4/05) |
|
FM CCIR transmitter - (electronic circuit added 6/07) |
|
FM Microphone - (electronic circuit added 7/03) |
|
FM Microphone - A micro-transmitter is so small and sensitive, it have only 8
easy-to-get parts and can be assembled in one hour. (6/03/2006) |
|
FM Oscillator - ASCII format (circuit design added 10/06) |
|
FM Portable - …(schematic added 04/05/06) |
|
FM radio (may be used with PC) Circuit - ….(design added 08/08) |
|
FM Radio Microphone with Internal Loop Antenna (Area 50) - This article began as a
design guide for hyper cranial erogenic field generators, however, your primitive
earth brains are completely unable to respond to erogenic fields in the 100MHz region.
I personally had a brain upgrade (for purely medical purposes of course) so I am able
to respond....(schematic / circuit added 4/08) |
|
FM Radio Transmitter (David Sayles) - This small transmitter uses a Hartley type
oscillator. Normally the capacitor in the tank circuit would connect at the base of
the transistor, but at VHF the base emitter capacitance of the transistor acts as a
short circuit, so in effect, it still is. The coil is four turns of 18swg wire wound
around a quarter inch former. The aerial tap is about one and a half turns from the
supply end. Audio sensitivity is very good when used with an ECM type microphone
insert. (added 11/05) |
|
FM Radio Transmitters with Opamp - Designed by Kamran Ahmed ….(circuit / schematic
added 5/03) |
|
FM Receiver using MPF107 - (electronic design added 6/07) |
|
FM Remote Speaker System - National Semiconductor Application Note (app note
added 07/08/09) |
|
FM RF Remote Control 88-108 MHz - 1KM Range (added 6/06) |
|
FM Stereo Modulator - (electronic circuit added 10/05) |
|
FM Stereo Transmitter - You'll find that this is a very easy project to build. It
will transmit good quality sound in the FM band ( 88, 108 mhz ). One inportant item is
that the IC chip operates on 3 volts DC. The chip will get destroyed if it is operated
on any voltage higher than 3.5 volts….(added 08/08/08) |
|
FM Synthesizer N°2 - This new FM transmitter is very simple and doesn't need any
RF tuning. First of all ,we have used an integrated VCO: The POS150 from
Mini-circuits. This excellent RF circuit covers all the FM Band in a voltage range of
4V to 8V. The Kvco factor is very stable all over the FM band, consequently, we have
applied the BF signal directly on the control voltage line coming from the PLL.....(added
08/08/08) |
|
FM Telephone Bug (Tony van Roon) - (electronic design added 6/07) |
|
FM Telephone line Bug Transmitter (Aaron Cake) - (circuit / schematic design added
7/03) |
|
FM Telephone Transmitter - Receive telephone conversations on any FM radio with
this neat little device. (Tony van Roon's schematic added 2/06) |
|
FM Transmitter - ….(design added 03/08) |
|
FM Transmitter - A simple 2 transistor circuit with a Coil on the
PCB....(electronic schematic added 12/08) |
|
FM Transmitter - Miniature - (circuit / schematic added 5/03) |
|
FM Transmitter (2bjttx) - (circuit / schematic design added 6/06) |
|
FM Transmitter (Aaron Cake) - Here is the schematic, PC board pattern, and parts
placement for a low powered FM transmitter. The range of the transmitter when running
at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet.
This transmitter should not be used as a room or telephone bug....(electronic design
added 03/04/05) |
|
FM Transmitter (fmtx_dc) - This simple transmitter operates from a 9V battery as
shown above. I personally built this for a purpose. This is how it happened:"members
of my singing group find it difficult to handle a FM mic in Church. The choir sings in
acapella form and the congregation expect us to perform well. The old FM mic system
was not a perfect solution,....added 6/06) |
|
FM Transmitter (radiockt6) - (electronic circuit added 10/05) |
|
FM Transmitter (techlib) - Here is a new slant on the ubiquitous FM transmitter
circuit. It's an FM sender. It takes a line-level stereo signal, and puts out a mono
FM signal which can be received in another part of the house. It uses base modulation,
which has always worked well in the author's experience, though spread in
base-collector varicap behaviour may conspire to cause …(electronic design add 6/07) |
|
FM transmitter 0,4 W - (design idea added 08/08/08) |
|
FM Transmitter 1km Range 88-108 MHz - 1KM Range (added 11/05) |
|
FM transmitter 3 W (3W RF part) - With good antenna (dipole placed outdoor and
high) the transmitter has very good coverage range about 1500 meters, the maximal
coverage range is up to 20 km…(added 08/08/08) |
|
FM Transmitter Bug - This small transmitter uses a hartley type oscillator.
Normally the capacitor in the tank circuit would connect at the base of the
transistor, but at VHF the base emitter capacitance of the transistor acts as a short
circuit, so in effect, it still is. The coil ....designed by David Sayles (electronic
design added 6/07) |
|
FM Transmitter With Crystal Referenced PLL Frequency Control Using LMX1601 ATtiny2313,
AT90S2313 - An LMX1601 Phase locked loop, a discreet FET VCO, and an
AVR micro controller combine to make a stable, easy to use monophonic FM transmitter
that includes a an audio activated switch that turns the transmitter on only when its
being used…(project added 6/07) |
|
FM Voice Transmitter - This miniature transmitter is easy to construct and it's
transmissions can be picked up on any standard FM radio. It has a range of up to
1/4-mile (Tony van Roon's 400 meters) or more, depending on the line-of-sight,
obstructions by large buildings,etc. It is great for room monitoring, baby
listening, nature research,....(Tony van Roon's electronic design added 6/07) |
|
FM Wireless Mike - low power frequency modulated transmitter using two
transistors. The circuit works with 9v power supply. . (added 9/04) |
|
FM 88MHz...108MHz amplifier - (electronic circuit added 6/07) |
|
FM3 Mods - (electronic circuit added 7/03) |
|
Four Channel Wireless Transmitter and Receiver - The Wireless KT4A Transmitter and
KR4A Receiver have been designed to offer moredata channels than the original KT418S2
and KR418S2 projects that were published inthe April 1999 issue of Popular Electronics
magazine (circuit added 09/06) |
|
Four Transistor Tracking Transmitter - (Tony van Roon's electronic schematic /
circuit added 4/02) |
|
Frequency Agile 80m CW QRP Transmitter - (electronic design / schematic added
2/05) |
