Voice-Modulated Pulse Fm Ir Transmitter

  
This circuit has a 741 audio amplifier, which is fed by a microphone (use an amplified type), an FM
Voice-Modulated Pulse Fm Ir Transmitter - schematic

modulator, and a CMOS timer that acts as a VCO. The LED is pulsed with the timer output (the booster circuit can be used for increased range). This yields an FM-modulated, pulsed IR beam.



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News


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    In many cases, the GatesAir transmitters will replace aging tube models, which will help with Cumulus' goal of reducing operational expense and energy use in its plants as part of the oadcaster's sustainability efforts. The order includes air <
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    The Bridgeport site is one of several locations that will see a complete replacement of systems, including a modernized building to house all transmission, auxiliary and cooling systems. All will be outfitted with the HD Radio
     27 March 2017
  • RadioandMusic.com
    RadioandMusic.com Listing various achievements as an outcome of measures taken in recent years, he said as far as All India Radio was concerned, a total of 610 (MW-143, SW-48, FM-419) which included 195 100 W had been commissioned by 10 Feua
     15 March 2017
  • Radio World
    I also grounded the unipole feed on the troubled tower to keep AM voltages to a minimum while workers were on it. Grounding was by a ... transmit antennas. The had to be reduced in power or completely shut down for much of the project.<
     7 March 2017
  • Radio magazine
    11, all NRK, P4 and Radio Norway were shut down in that region. All local stations in Nordland continue to transmit on FM, as will the majority of all local radio stations in Norway. NRK also states that there has been no dramatic drop
     23 February 2017
  • Radio magazine (blog)
    NDTV GatesAir recently upgraded the Swedish — and now I can get very good FM signal quality from the Swedish channels long inside Norway. Sweden was always in front of radio content and in the 60s and 70s Swedish Radio was very popular
     9 January 2017
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    KCRW is a six-station cluster consisting of KCRW, Santa Monica, KDRW, Santa Barbara, KCRU, Oxnard, KCRY, Mojave & KCRI, Indio, and KERW, Los Osos-Baywood Park. Additionally it operates seven low power translator stations in the communities o
     20 December 2016
  • Radio World
    Eric Pere: Generally, operate far more efficiently than DTV or DAB transmitters so, the advantages of water cooling aren't as significant in the FM sphere. If a manufacturer ..... Fewer engineers entering the market today do so as
     23 November 2016
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    The manufacturer wrote that the amps are identical to those in certified it makes, and that the transmitters imported and marketed by SCMS “are by all intents and purposes the same models already certified by an FCC approved test lab.&rd
     29 September 2016

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