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  1. #1
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    frequency valve problems

    Hi there i want to turn on solenoid valves depending on frequency
    i am thinking of f to v converter so that i use a comparator to turn on the wanted valve.
    i bought the lm2907 but the schematic is confusing will the circuit of page 16 work?
    thx

    •   Alt3rd August 2009, 14:10

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    lm567c frequency switch circuit

    Quote Originally Posted by pakitos
    Hi there i want to turn on solenoid valves depending on frequency
    i am thinking of f to v converter so that i use a comparator to turn on the wanted valve.i bought the lm2907 but the schematic is confusing will the circuit of page 16 work? thx
    Which is the schematic and where is page 16?:D:D:D Post your schematic and write what confusions you have regarding that. Good luck



    •   Alt3rd August 2009, 16:34

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    tone decoder

    You may want to consider using an LM567 Tone Decoder. From the datasheet (http://www.national.com/ds/LM/LM567.pdf):
    The LM567 and LM567C are general purpose tone decoders
    designed to provide a saturated transistor switch to ground
    when an input signal is present within the passband. The
    circuit consists of an I and Q detector driven by a voltage
    controlled oscillator which determines the center frequency
    of the decoder. External components are used to independently
    set center frequency, bandwidth and output delay.



    •   Alt3rd August 2009, 17:59

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  4. #4
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    lm567+frequency detection

    thx pranam77 for your quick reply sorry but I thought it was obvious meant the schematic on the lm2907 datasheet ( page 16 the first one).

    the confusion is which one is suitable to my application?
    Is it better to find my own configuration?




    has anyone used a similar application for THIS Ic
    thx again



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    schematic lm567 tone detector

    Yes the given application and the schemtaic on page 16 will work fine for you. But the frequency input should be in the limits of the device. Read the datasheet carefully and then impliment the circuit. In case the input frequency is above 10Khz , you amy consider the sugession given by "GSM man" Good luck.



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    lm567.general purpose tone decoder

    I am going to use an audio signal and consider two valves for now i.e. two frequencies. thinking to usr a comparator at the output to select two voltages and accordingly turn on valves.
    btw I know that this can be done using plc or microcontroller but the point is that I should not use them
    thx
    Good Luck to you too


    I have tried the circuit with some modifications in R and C vor every 1k I am getting a 1V ( linear change)



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    lm567 application notes

    I just want to thank pranam77 your support.
    I have connected the circuit on the datasheet then used two comparators and two 9v relays to which 3 pums were connected.
    the input is and audio signal was used from my pc.
    the performance was outstanding.
    It just needs a lighting system



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