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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  • Radio magazine (blog)
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  • Radio World
    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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    This is because most systems from the transmitter to the antenna are frequency-specific. This concept may seem foreign to some radio oadcasters. Generally speaking, today's solid-state , filtering, transmission line and antennas are
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