external oscillation


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  1. #1
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    I am trying ot get a sin wave at the output. From the manuals of picbasic pro, they say to add a low pass filter, I did this, it dos remove the extra noise, but it does not make it a sinwave. Anybody know how to make it a sin wave ?

    ken

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    Did you check this post?

    http://www.picbasic.co.uk/forum/showthread.php?t=718



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  3. #3
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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

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

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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

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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!
    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte

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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

  7. #7
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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

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

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