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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 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 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 (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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