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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 Portable - …(schematic added 04/05/06) |
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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 Receiver - Based on TEA5711T and TDA7050 Integrated Circuits (by
Patrick & Pedro).... |
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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°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 - A compact 2 transistor transmitter for use at VHF
frequencies…. [Andy Collison] |
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FM Transmitter - 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,....[Andy Collison'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 Circuit with OPamp - ….(electronic schematic added 03/08)
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FM Transmitter for Band 2 VHF - ….(electronic schematic added 03/08)
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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-2 - ….(Circuit design added 03/08) |
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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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FPGA makes simple FIFO - 26-Oct-00 Issue of EDN-Design Ideas....The circuit
in Figure 1 is an FPGA-based, synchronous FIFO that uses the same clock for read and
write operations. The circuit can generate FIFO-occupancy flags with a minimum of
logic. The boxed area in Figure 1 shows a more conventional occupancy meter. The
circuit is implemented in a demultiplexer that writes data in the FIFO when the data
arrives and reads data according to FIFO occupancy....PDF contains several circuits,
scroll to find this one....[Design by Luis Miguel Brugolaras, SIRE, Madrid, Spain] |
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