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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,.….
[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 (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
…(electronic design add 6/07) |
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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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[_OLD-ads-dont_upload/OLD I-ADS from web/ad-djandassoc.htm] |
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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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Four Band Double Tuned Preselector - The circuit requires an RF input which
can be from a longwire or a loop antenna. The Preamplifier has a range from 550kHz
(Medium Wave) up to 30 MHz in the SW band. The input Switch S1, applies voltage to a
set of relays which switch in the appropriate coils.... [Designed by David Sayles] |
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General IR receiver - Schematic only, no circuit description |
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GPS Receiver Based Frequency Standard - Frequency accuracy has been a topic
of special interest to many amateurs and experimenters since the early days of radio.
Until recently, the best frequency standard available to most hams was a crystal
oscillator carefully adjusted to zero-beat.... [By Brooks Shera, W5OJM] |
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GPS Receiver Gamin Eagle Etc to PC Interface Cables - (circuit / schematic
design added 6/06) |
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Hear Amateurs on your FM Radio! - amateur radio construction projects….
[from Peter Parker's website] |
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HeNe Laser Transmitter/Receiver (Aaron Cake) - (circuit added 8/03)
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High Performance FM Receiver for Audio & Digital - (circuit / schematic
design added 6/06) |
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High quality AM through your FM stereo - amateur radio construction
projects…. [from Peter Parker's website] |
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High Speed Low Skew RS422 Drivers & Receivers Solve Critical System Timing Problems
- National Semiconductor Application Note 05 Oct1998 / (app note added 7/02)
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How to Build a 300MHz AM RF Remote Control System - (electronic circuit
added 4/05) |
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