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I What counts as a circuit?

  1. Jun 9, 2018 #1
    I have to construct suitable circuits to show the operational principles of some sensors: pH meter, sound, light and temperature. Would these count as circuits? or diagrams? (I'd say diagrams).
    [​IMG]
    I am finding it hard to find circuits showing how sound sensors and pH sensors work etc and the ones I do find are beyond my level such as:
    schem1.png
    I under stand how the sound sensors work, such as the diaphragm microhphone (shown in first picture). Just wanting to know if I could use diagrams as circuits it would make my life easier.
     
  2. jcsd
  3. Jun 9, 2018 #2

    anorlunda

    Staff: Mentor

    When you say construct, do you mean circuits that actually work?

    Is this homework?

    Edit: Can you use instruments like meters or an oscilloscope instead of circuits you build yourself?
     
  4. Jun 9, 2018 #3
    I don't think it really matters, it just says "Learners will produce circuit diagrams of the transducer/sensor chosen and explain their operation anduses".
    And yes but I didn't think I should put in the homework part due to only wanting to know if the first one counts as a circuit.mb
     
  5. Jun 9, 2018 #4

    anorlunda

    Staff: Mentor

    I think they mean that they will teach you how to do that.
     
  6. Jun 9, 2018 #5
    We have to research it but for some of the sensors such as sound and pH I can't find any basic circuits
     
  7. Jun 9, 2018 #6

    davenn

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    Honestly ? Do you know of Google/Bing ?

    I typed pH meter circuits into Bing/Google and got dozens of circuits

    https://www.bing.com/search?q=pH+me...s=n&sk=&cvid=aec1ef5562ac4a0aaf5c6f26fbc0448a


    A sound sensor can be as simple as a microphone ( the most common sound sensor)
    it will be connected to a preamp circuit and then outputted to your recording device ( PC etc)

    I will let you google microphone and preamplifier circuits


    Dave
     
  8. Jun 10, 2018 #7

    CWatters

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    I can't see the first image in the OP.
     
  9. Jun 10, 2018 #8
  10. Jun 10, 2018 #9

    CWatters

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    The link works and I believe it's a good example of what they are asking for. You need to add words explaining how it works and uses.
     
  11. Jun 10, 2018 #10
    I have explained how every sensor I used works such as the pH meter, sound, temperature, light just the graphs I was strugling on as the graphs I got for some way beyond my learning level.
     
  12. Jun 10, 2018 #11
    Could you please take a look at this? https://www.physicsforums.com/threa...ion-principle-of-the-ldr.949307/#post-6011157
    If you do the circuit I constructed isn't how I measured light. but I have to construct a circuit and using my data to illustarte how an LDR works among other sensors.
     
  13. Jun 12, 2018 #12

    CWatters

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    If I understand correctly your task is mainly to explain how sensors work and are used. So you need a circuit that models the inner workings of the sensor and block diagrams for the rest (amplifiers, A-D converters, meters etc)

    If they expect you to build and test the circuits you need detailed circuits for the rest as well.
     
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