Fm Modulator Circuit

  

Rating: 0.00 / 5 
Inside:
FM Radio Circuits / RF Circuits
The FM modulator is built with a Motorola MC1648P oscillator. Two varactors, Motorola MV-209, are used to frequency modulate the oscillator. The 5000- potentiometer is used to bias the varactors for best linearity. The output frequency of approximately 100 MHz can be adjusted by changing the value of the inductor. The output frequency can vary as much as 10 MHz on each side. The output level of the modulator is -5 dBm. In this prototype, the varactor bias was 7.5 V for best linearity;
Fm Modulator Circuit - schematic

but this could be different with other varactors.

Recommended videos


  • Frequency Modulation tutorial and FM radio transmitter circuit
    Duration: 4:43.
  • Weekend Projects - Super Simple FM Transmitter
    Duration: 5:02.
  • Simple FM Transmitter Circuit
    Duration: 3:02.

News


  • RF Globalnet (press release)
    Alexander Zink, researcher at the Fraunhofer Institute for Integrated IIS based in Erlangen, Germany, would like to provide clarification around a common misunderstanding: »Digital radio works the same way as terrestrial radio via air wa
     12 May 2016
  • EE Times
    EE Times businesses, such as mine in the test-and-measurement market, are less subject to aupt change because test systems build upon past standards. But new concepts, microcomputer entries, IoT, and more software-oriented solutions, create&
     20 April 2016
  • Motherboard
    Motherboard Minitrack was designed to “listen in” at 108.0 MHz and 108.3 MHz, just above the radio band, which was much lessoccupied in the 1950s than it is now. ... It apparently required stringing up an untidy nest of coaxial
     17 March 2016
  • IEEE Spectrum
    IEEE Spectrum The expectation has been that nanoelectromechanical systems (NEMS) will replace its predecessor microelectromechanical systems (MEMS) in the varied range of applications for which MEMS are currently used. However, the emergence
     10 March 2016
  • Smithsonian
    Smithsonian One of Apollo 10's main missions was to test the that allowed the spacecraft's lunar lander module to detach and re-attach to the command module. But while the modules were separated for several hours, the crew members began hear
     23 February 2016
  • Science Daily
    ... Juan-Carlos Licona, Madelon Lohbeck, Erika Marín-Spiotta, Miguel Martínez-Ramos, Paulo Massoca, Jorge A. Meave, Rita Mesquita, Francisco Mora, Rodrigo Muñoz, Robert Muscarella, Yule Nunes, Susana Ochoa-Gaona, Alexandre
     8 February 2016
  • IEEE Spectrum
    IEEE Spectrum for Consumer DevicesIn summary, Energous uses multiple, steerable beams of 5.8-gigahertz radio waves emitted from an antenna array to form a small pocket of energy around a device. Inside the pocket, the device's receiving
     22 January 2016
  • CNET
    CNET ... the headphones can draw juice from your device to power components in the headphone, which could include an internal DAC (digital-to-analog converter) and amplifier that bypass the internal DAC of the iPhone and/or active noise-cance
     5 January 2016
  • IEEE Spectrum
    IEEE Spectrum The world's big oadcasters will be tuning in to see the preparations in 2016 as Norway moves its national oadcasters from analog transmissions to a digital format. The switchover will be to the Digital Audio Broadcasting (D
     23 December 2015

.


Leave Comment

characters left: