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Oscillator Schematic 3 to 7 MHz and 217 Mhz

  1. Nov 21, 2012 #1
    Hello All,

    I would like a schematic that would help me to create a simple oscillator that can drive an aircore coil or other components at 3 to 7 MHz and 219 MHz approximately.Any help is appreciated.

    Best regards,

    Gary
     
    Last edited by a moderator: Nov 21, 2012
  2. jcsd
  3. Nov 22, 2012 #2

    NascentOxygen

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    Staff: Mentor

    One of the problems with "simple" oscillators is that they can't deliver much power to any circuit, and that they change their frequency or stop oscillating when you connect a load. So you usually need a buffer between the oscillating stage and the load. So we are moving away from "simple".

    The simplest arrangement may be where it is feasible to use the aircore coil as the inductance in the resonant circuit of the oscillator itself. You'd need to switch or vary capacitors to change the frequency.

    A google search on "RF oscillator" should turn up a surfeit of candidates. For a 200MHz oscillator you may need a different circuit, one less forgiving to construction liberties.
     
  4. Nov 22, 2012 #3
    At 3 to 7 MHz you can have a Schmitt trigger oscillate. Easy, reliable.

    At 200MHz you need experience. If not, you will fail. Your best hope would be a completely freezed design, already at your precise frequency, where the printed circuit is fully drawn - something like a kit.
     
  5. Nov 22, 2012 #4

    NascentOxygen

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    A couple of transistor oscillators w/ handy construction hints & cautions, for the 4 MHz range:
    http://www.sm0vpo.com/blocks/osc7m00.htm [Broken]
    http://ece.wpi.edu/courses/ece2011/labs/lab5A09final.pdf

    Many are listed here: http://www.epanorama.net/links/oscillator.html
    including a simple CMOS hex inverter oscillator: http://www.ee.washington.edu/circuit_archive/circuits/F_ASCII_Schem.html#ASCIISCHEM_004 [Broken]

    Guaranteed hours of fun! :smile: :smile:
     
    Last edited by a moderator: May 6, 2017
  6. Nov 22, 2012 #5

    NascentOxygen

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  7. Jan 14, 2013 #6
    Thanks for your informed response.I appreciate it.
    Best regards,

    Ged
     
  8. Jan 14, 2013 #7
    Thanks for replying, where could I get such a kit?

    Regards,
    Gary
     
  9. Jan 18, 2013 #8

    NascentOxygen

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    Staff: Mentor

    Within what frequency range could the 217 (or is it 219) MHz oscillator be? What application do you have it mind for this?
     
  10. Jan 19, 2013 #9

    NascentOxygen

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    Staff: Mentor

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