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27 MHz FM Receiver - The FMR-201 is a crystal controlled single channel receiver,
comprising of receiving, decoding and open collector output sections
.(circuit added
08/07/06) |
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27MHz/ 49 MHz Walkie Talkie - Lots of people are requesting walkie-talkie and RF
remote control schematics, so here is some. Building these circuits needs special
equipment and expertise in RF circuits. If you are going to experiment with these
circuits, please ....(circuit added 08/08/08) |
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4 Transistor FM Receiver - This is a pocket sized receiver I built in 1994. The
idea was to make a simple but useable receiver running off 3V. My previous 6
transistor receiver was more bulky, requiring 12V. This meant 10 x AA cells. I
designed and made a PCB,....(circuit added 08/07/06) |
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70-120MHz FM Receiver - This simple one chip FM receiver / TV tuner will allow you
to receive frequencies from 70 up to 120MHz. With this small receiver it is possible
to pickup TV stations, entire 88, 108MHz FM band, aircraft conversation and many other
private transmissions.....(added 05/06/07) |
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AN-146: FM Remote Speaker System - National Semiconductor Application Note
(app note added 07/08/09) |
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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 Booster - (electronic Circuit / Schematic added 10/04) |
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FM Bug 1.859.telia - (electronic circuit added 4/05) |
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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. (6/03/2006) |
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FM Microphone 1 - (electronic circuit added 7/03) |
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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 -
.(design added 08/08) |
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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
(circuit added 08/07/06) |
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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. (added 11/05) |
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FM Radio Transmitters with Opamp - Designed by Kamran Ahmed
.(circuit / schematic
added 5/03) |
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FM Receiver using MPF104 - (electronic design added 6/07) |
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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 ....(electronic design added 6/07) |
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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 - (electronic circuit added 10/05) |
|
FM Stereo Receiver - Based on TEA5711T and TDA7050 Integrated Circuits (by Patrick
& Pedro) (circuit added 08/07/06) |
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FM Telephone Bug (Tony van Roon) - (electronic design added 6/07) |
|
FM Transmitter - A simple 2 transistor circuit with a Coil on the
PCB....(electronic schematic added 12/08) |
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FM Transmitter (2bjttx) - (circuit / schematic design added 6/06) |
|
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 (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 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) |
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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 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) |
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FM/ AM Regenerative Receiver - Two transistor receiver. (circuit added
08/07/06) |
|
FM3 Mods - (electronic circuit added 7/03) |
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ISM Receiver with TDA5100/ TDA5200 - (electronic circuit added 6/07) |
|
LA1800 FM Radio - 3V superheterodyne FM receiver
.(electronic schematic added
11/08) |
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One Transistor FM Receiver 1 - Uses MPF102 FET transistor and LM386 as an audio
amplifier (circuit added 08/07/06) |
|
One Transistor FM Receiver 2 - This radio is sensitive enough to tune 20 stations
across the FM band, some with volume high enough to drive a small PM speaker. The
ability to tune 88.9 MHz and 89.1 MHz is testimony of its selectivity. The signal-to
noise ratio rivals that of the better walkman type radios.
.(electronic schematic
added 11/08) |
|
One Transistor FM Receiver 3 - (electronic schematic / circuit added 4/02) |
|
One Transistor Regenerative Receiver - (circuit design added 8/03) |
|
Simple FM Receiver - With the TDA 7000 you can build an FM radio with a minimum of
components; most of them so easy to manage...like the ceramic capacitors that do not
require polarization...and only two resistors. The components you will employ will be
of small dimensions and low cost. Even the integrated circuit itself, the TDA 7000, is
not of great cost.
.(circuit design added 11/08) |
|
Tabletop FM Radio - (circuit added 07/07/07) |
|
TDA7088 Receiver - Site has annoying popups. The electronic diagram of the
monophonic FM receiver made with TDA7088T is shown on Pic.4.12. If built with SMD
components it can be placed in a matchbox, altogether with two button-type batteries.
The operating principle of this device is given in the...(circuit added 08/07/06) |
|
Variety of receiver converter projects - The FM broadcast band was moved
immediately after World War II from its original spot just below 50 Mc to the present
88-108 Mc band. Hallicrafters was one company to offer receiving converters for
those who had the old FM radio sets. The offerings included a one-tube converter
that fits inside a console and draws power from the audio output tube socket (using an
adapter).,,,,(circuits added 05/06/07) |
