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Feedback FM Receiver - …(electroninc design added 04/05/06)
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FM Band Monaural Transmitter - (Circuit design added 8/03)
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FM Band PreAmplifier - (circuit / schematic design added 6/06)
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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.
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FM Booster - ..... |
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FM BroADCast Audio Transmitter - (schematic / circuit added
6/07) |
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FM bug - Schematic only, no circuit description |
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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)
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FM CCIR transmitter - .... |
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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…. |
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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..... [from Harry Lythall's website] |
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FM Oscillator - ASCII format (Circuit design added 10/06) |
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FM radio (may be used with PC) Circuit - …..... |
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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) |
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FM Radio Receiver - Frequency adjustment is accomplished with BB105 varicap
diode..... |
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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. |
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FM Radio Transmitters with Opamp - An low power FM Transmitter using an
op-amp as the audio preamp and a single transistor as the RF amplifier…. [Designed by
Kamran Ahmed] |
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FM Receiver Using MPF102 - An FM regenerative receiver using a single FET
and one audio amplifier IC…. |
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FM Receivers - Here is how you make a superregenerative circuit. Choose a
regenerative amplifier circuit configuration that requires more current during
oscillations than when not oscillating. Adjust the regenerative amplifier to
oscillate. Add a small circuit that uses the current of the amplifier to charge a
capacitor while oscillations are taking place. Once the capacitor is charged, the
voltage on..... |
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FM Remote Speaker System - National Semiconductor Application Note
(app note added 07/08/09) |
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FM RF Remote Control 88-108 MHz - 1KM Range (added 6/06) |
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FM Stereo Modulator - .... |
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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…. [Randy Linscott] |
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FM Synthesizer N°1 - In order to simplify the transmitter design, we've used
the new pll circuit from Motorola :the MC145170. This PLL includes the prescaler
and a serial standard bus called SPI…. [Michel P Web site] |
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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.....
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FM Telephone Bug - Would you like to be able to amplify a phone call so
everybody can hear it? Or perhaps you'd like a way to record phone calls for
record-keeping purposes. If either idea sounds good to you, then you might want to
build the FM Telephone Transmitter describe in this article. It's a simple, yet
ingenious device that connects in series with a phone line, "reals" power from the
latter, and transmits both sides of a conversation to an FM radio tuned to between 90
and 95 MHz.…. [Tony van Roon's circuit] |
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FM Telephone line Bug Transmitter (Aaron Cake) - (circuit / schematic design
added 7/03) |
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FM Telephone Transmitter - Receive telephone conversations on any FM radio
with this neat little device…. [Tony van Roon's circuit] |
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FM Transmitter - Take care with transmitter circuits. It is illegal in most
countries to operate radio transmitters without a license. Although only low power
this circuit may be tuned to operate over the range 87-108MHz with a range of 20 or 30
metres….. [Andy Collison] |
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FM Transmitter - A portable FM transmitter that can be used to replace a FM
microphone….. David Celestin's circuit] |
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FM Transmitter - A simple 2 transistor circuit with a Coil on the
PCB.....(electronic schematic added 12/08) |
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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) |
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FM Transmitter (radiockt6) - .... |
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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)
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FM transmitter 0,4 W - (design idea added 08/08/08) |
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FM Transmitter 1km Range 88-108 MHz - 1KM Range (added 11/05)
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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…..... |
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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..... [by David Sayles] |
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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) |
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FM Transmitter-Miniature - (circuit / schematic added 5/03) |
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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 circuit] |
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FM Wireless Mike - low power frequency modulated transmitter using two
transistors. The circuit works with 9v power supply....... |
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FM 88MHz...108MHz Amplifier - .... |
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FM/ AM Regenerative Receiver - Two transistor receiver...... |
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FM3 Mods - (electronic circuit added 7/03) |
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Ham Radio BFO - circuit diagram of beat frequency oscillator using BF494
and how to listen amateur radio communication on ordinary BC receiver. |
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High Performance FM Receiver for Audio & Digital - (circuit / schematic
design added 6/06) |
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High Power FM Microphone FM Bug - My FM Wireless Microphone has been a very
popular project with beginners and experienced constructors alike. It has been used
inside guitars and as the basis of a remote control system. …. [from Harry Lythall's
website] |
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