simple dual slope ADC problem

Discussion in 'Homework Help' started by mrmike612, Dec 2, 2012.

  1. mrmike612

    Thread Starter New Member

    Dec 1, 2012
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    I have a project on doing simple dual slope ADC using only our lab kit component.But the problem is I can't not come up with any ideas to make switch from V in and Vref controlled by my kits which is included only basic transistors 2en3904,JFET,and some IC like 7474,7485,LM324,counter LS191,BCD display.The switch should be controlled by the clock.
    Does anyone have something interesting about dual slope please help me :confused:
    here is diagram that what professor asking me to follow
     
  2. tshuck

    Well-Known Member

    Oct 18, 2012
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    675
    So, to be clear, you are asking how one can switch between Vin and Vref using only the components listed, correct?
     
  3. mrmike612

    Thread Starter New Member

    Dec 1, 2012
    11
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    yeah,right.i know that using manual switch is impossible to operate a dual slope adc but i can't think of any solutions to make a switch between vin and vref and it has to be controlled by a clock.there must be something that my limited knowledge can't reach.:mad:
    I have to build the switch to zero out the integrator either.
     
  4. crutschow

    Expert

    Mar 14, 2008
    12,991
    3,227
    The JFET likely could be used as a switch. What is its part number?
     
  5. mrmike612

    Thread Starter New Member

    Dec 1, 2012
    11
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    its MF102
    i think about it but i think it can'tcontrol the time switching between two stage
     
  6. mrmike612

    Thread Starter New Member

    Dec 1, 2012
    11
    0
    Any one who has any suggestion of any kind of component is okay.I'll figure it out I try to do on my own.
     
  7. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    I'd say you should look into transmission gates.... you can configure your transistors as an analog multiplexer...
     
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