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[BASIC] How to interpret this circuit (including diodes), need detail explanation

Discussion in 'Electronics Homework Help' started by Orzechix, Dec 19, 2016.

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  1. Orzechix

    Orzechix

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    Dec 19, 2016
    This thing is clamp circuit from this website: http://www3.nd.edu/~lemmon/courses/ee224/web-manual/web-manual/lab5/node9.html. I dont understand how it works or maybe in half way. Could someone provide detailed solution (in horse sense ;) )? Let's say for Vin = 3 VDC and another scenario Vin = 10 VDC. Without any further details, i mean value of resistors and diode forward voltage (i guess 0.7 but still). The thing is how to tell the polarization of those diodes?
    I know that if this is diode: A ---->|---- K so it should be polarised in such way: + A ----->|----- K - to allow current flow through it with 0.7 V drop.

    Thanks in advance!
     

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    Last edited: Dec 19, 2016
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Assume the diodes are perfect.

    Remove D1 from the circuit and write a formula to describe Vout in terms of Vin for a positive Vin.

    Next consider the effect of a perfect D1.

    Lastly, what happens for a negative Vin?
     
  3. Orzechix

    Orzechix

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    Dec 19, 2016
    Sorry for posting in wrong section. I still dont get the way to deal with such circuit. I dont know where to start, you said to remove D1 but why actually this one. I draw some schematics as you typed. But im unfortunately still confused :/.
     

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  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Do you understand what a voltage divider does?
     
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