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AM/FM Modulator

Discussion in 'General Electronics Discussion' started by galaxy, Sep 5, 2015.

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  1. galaxy


    Nov 3, 2012

    I have been asked by a High School where I do some IT work to come up with something for Senior Science.
    Basically it is a switchable AM and FM modulator, to display the difference in waveform on a CRO.
    I've had a google around but don't seem to be able to find anything suitable, at least not in the lower price range the school can afford.
    Requirements are.
    1. Pretty cheap (sub AUD$200 ?)
    2. Able to swiitch between AM and FM outputs
    3. Inbult 1Khz modulation and external (microphone) source
    4. Reliable, so no old boat anchor Sig gens.
    5. Simple to operate.
    6. Probably about 1-10MHZ carrier as the CROs are all sub 25Mhz models.

    Anyone know of such a beastie?
    Or at a pinch I could build something...circuit ideas welcome.
  2. duke37


    Jan 9, 2011
    People make very low power transmitters to use with old medium wave radios.
    These produce an AM signal only.
    Look up pantry transmitter.

    AM can be seen on a scope and the modulation depth can be measured. FM would be difficult to see on a scope since the amplitude is constant. You could perhaps make a generator using a voltage to frequency convertor with very large deviation.
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