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Amplifier for frequency generator

Discussion in 'Electronic Basics' started by Goran, Jun 26, 2013.

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  1. Goran

    Goran Guest

    Hi.

    Im making one simple mcu based device that will work as electronic
    repellent. Nothing special.

    Only difference is that i want to check other frequency ranges and to do
    so, i have to connect my device to function generator ( 0 - 4 MHZ ).

    Does someone knows how to build amplifier for this function generator ?
     
  2. What's electronic repellent?
    Doesn't sound like something we want on SEB. :^)

    Nothing special.
    Well you need some spec's... Freq is 0-4 M Hz. What's the voltage gain, and max output current? There are an awful lot of opamp's out there.

    George H.
     
  3. Phil Allison

    Phil Allison Guest

    ** ROTFL !!

    There is only one "device" that can reliably rid your premises of mice, rats
    and cockroaches - and that device is known as a cat.

    ** EMI regulations be hanged.


    ** Classic.



    .... Phi
     
  4. Goran

    Goran Guest

    ------------------
    Cat is good solution ( i have 2 ) but this project is more aimed on
    insects :)

    There are bunch of them on the mark but my project is more on the
    research side and nothing of this will go commercial.

    Freq is 0-4 M Hz. What's the voltage gain, and max output current?
    - I was thinking of 3V.
    - the device should work in 1-2 meter range so i will need relativly
    small current.
    - main frequency range will be from 1khz - 60 khz and 300 - 400 khz
     
  5. Jamie

    Jamie Guest

    But you'll be also hurting your pets ears..


    Jamie
     
  6. Goran

    Goran Guest

    Like i wrote, it for testing purposes and no animal will be near this :)

    Do you have some schematics or link on some amplifier ?
     
  7. Sorry I'm still confused. Are you broad casting the frequencies into the air with an antenna? Or turning it into sound waves? If it's sound then what's the transducer? There are ultra sonic piezo transducers, but I don't think they couple to air very well. (big impedance mismatch.)

    George H.
     
  8. Jamie

    Jamie Guest

    http://www.hep.upenn.edu/SNO/daq/parts/ad842.pdf

    That only does a 100ma output but you can hang a totem pole
    off it.

    Jamie
     
  9. Goran

    Goran Guest

    Sorry I'm still confused.
    Are you broad casting the frequencies into the air with an antenna?

    Or turning it into sound waves?

    If it's sound then what's the transducer?
    There are ultra sonic piezo transducers, but I don't think they couple
    to air very well.
    -----------------------------------
    Hi George !

    For 30 - 60 khz i will use ultrasonic piezo. But for other frequency
    ranges i was planning to use antenna with gain control.

    I have made one simple project with ultrasonic piezo and it worked quite
    good. But this project has fixed frequency. Now i have to test few
    different frequency ranges so this could be a problem.
     
  10. I'd forget the antenna and E&M radiation. That's not going to do anything, unless you get enough power to 'cook' the critter.. and then the FCC might object..
    You might start by finding our what frequencies the various critters can hear.
    I'd bet some biologists have already done this.

    George H.
     
  11. Fred Abse

    Fred Abse Guest

    Chipmunk fleas can jump ten feet :)

    Around Subway Cave, adjacent Lassen Volcanic National Park, in Northern
    CA, there are official notices regarding chipmunk fleas carrying bubonic
    plague.
     
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