external oscillation

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  1. - 9th October 2006, 21:26 #1
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    If it's for a single frequency with a 50% duty cycle you could still use a pair of integrator made with Op-Amp.
    Steve

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  2. - 11th October 2006, 00:49 #2
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    I need 6 frequencies.
    maybe using an analog circuit using amplifiers to make the oscillation and the pic to control + / - a few kilohertz to get lets say between 20 to 30 khz ??
    The goal of this is to create an ultrasonic bird repeller, maybe the square waves (although noisy) can scare them off.

    k
  3. - 11th October 2006, 03:48 #3
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    Quote Originally Posted by lerameur
    ... maybe the square waves (although noisy) can scare them off.
    k

    Make sure it won't attract the big insects if not small birds!
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  4. - 11th October 2006, 03:58 #4
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    Default It's not just for birds anymore . . .

    Hi lerameur,
    I need one of those too, to repel pidgeons, and neighbors with BIG STEREOS!
    About 300 watts ought to do it! Someone on eBay is already selling PICs programmed to do this and he sells tranducers too!
    Good luck with the birds, let us know how it works.
    Joe
  5. - 11th October 2006, 05:16 #5
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    Some DDS synth may do the job.

    some DACs to control some VCOs too.

    Tons of different way. A single PIC.. maybe good for low frequency.

    Do you have all frequency values? It could be possible with some effort...

    EDIT: you said 6 frequency... All together or what?

    Be carefull some birds are much intelligent than others...
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    Last edited by mister_e; - 11th October 2006 at 05:22.
    Steve

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  6. - 11th October 2006, 13:26 #6
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    well I thought this thing could be battery operated, at 300watt forget that..

    here is the code I would like to use:
    Also, one freqnecy the output looks good, but more then one the frequency varies from 11k to 31khz and very unstable.

    @ DEVICE HS_OSC
    TRISB = 0

    loop: FREQOUT PORTB.1,10000,20000
    ' Pause 100 ' Delay for .5 seconds

    FREQOUT PORTB.1,10000,26000 ' Turn on PORTB for 1- sec at 26Khz
    Pause 100 ' Delay for .5 seconds

    FREQOUT PORTB.1,10000,21000 ' Turn on PORTB for 1- sec at 21Khz
    Pause 100 ' Delay for .5 seconds

    FREQOUT PORTB.1,10000,27000
    Pause 100

    FREQOUT PORTB.1,10000,22000
    Pause 100

    FREQOUT PORTB.1,10000,28000
    Pause 100

    FREQOUT PORTB.1,10000,23000
    Pause 100

    FREQOUT PORTB.1,10000,29000
    Pause 100

    Goto loop ' Go back to loop
  7. - 11th October 2006, 14:21 #7
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    Talking

    A look here ???

    http://shop.elv.de/output/controller...&detail2=10617

    ...

    no comment !!!
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    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
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