circuit schematic question (newbie)

Discussion in 'General Electronics Chat' started by NY10, Aug 19, 2010.

  1. NY10

    Thread Starter Member

    Jul 30, 2010
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    Hi, all

    I guess my question is about terminology in circuit schematics.

    If resistor or capacitor values are NP_0, what does this mean ?

    I guess it means the values are not populated, but then what does that tell about values in circuit schematics ?

    Thank you in advance.
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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  3. NY10

    Thread Starter Member

    Jul 30, 2010
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    I am not sure the website you posted is what I am referring to.

    I have some circuit schematics in low pass filter bank, and the values of resistors and capacitors are listed as NP_0

    The reason I asked this question is that I want to know what content of NP_0 is used in the circuit schematics.

    Or maybe in general, what does NP_0 mean in circuit schematics ?

    Thanks in advance.
     
  4. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    Can you post a scan of, or link to, a schematic that contains the NP_0 you are seeing?

    Ken
     
  5. NY10

    Thread Starter Member

    Jul 30, 2010
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    I attached the image of the circuit.

    It is a part of circuit and it shows the value of resistor and capacitor listed as NP_0

    As far as I know NP_0 means not populated, but then what does that mean ?

    Hope this gives enough information for you to guide me.

    Thanks in advance.
     
  6. marshallf3

    Well-Known Member

    Jul 26, 2010
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    Doesn't appear to mean anything in this case as I see both caps and resistors labeled as such. Chalk it up to some sort of house numbering scheme like "place this component before wave soldering" or who knows?

    Used to be NP0 (not NP_O) was used to indicate the temperature stability of a ceramic capacitor but now they're using C0G which holds essentially the same meaning.
     
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  7. StayatHomeElectronics

    Well-Known Member

    Sep 25, 2008
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    I would agree with marshallf3. It probably does not mean anything specific. I would guess it is just a place holder for the part value to be added later.
     
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  8. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    NY11,

    I agree with the others. This looks like a simulation program, or maybe just a schematic capture program. Where did you get it? Maybe you can contact the source. Or if you know who the program's vendor is, you could contact them.

    Ken

    I just noticed that the components with values have them in the location of "NP-0". It might be that "NP_0 is the default label for the components' values, until they are assigned.
     
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