What is input source?

Some articles on input:

Improvement: Active Current-to-voltage Converter - Op-amp Circuit Operation
... Zero input voltage results in no voltage drops or currents in the circuit (click Exploring in ) ... Positive input voltage ... If the input voltage VIN increases above the ground, an input current IIN begins flowing through the resistor R ...
Implementation - Op-amp Implementations - Non-inverting Schmitt Trigger
... It adds a part of the output voltage to the input voltage thus "helping" it during and after switching that occurs when the resulting voltage is near the ground ... so, the circuit does not need an amplifier with a differential input ... Since conventional op-amps have a differential input, the inverting input is grounded to make the reference point zero volts ...

Famous quotes containing the words source and/or input:

    I am no source of honey
    So why should they turn on me?
    Tomorrow I will be sweet God, I will set them free.

    The box is only temporary.
    Sylvia Plath (1932–1963)

    Celebrity is a mask that eats into the face. As soon as one is aware of being “somebody,” to be watched and listened to with extra interest, input ceases, and the performer goes blind and deaf in his overanimation. One can either see or be seen.
    John Updike (b. 1932)