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This circuit inverts and amplifies the input, multiplying the voltage by -3, using an
<a
href="http://en.wikipedia.org/wiki/Operational_amplifier">op-amp</a>.
When connected in a negative feedback configuration,
the op-amp attempts to keep its two inputs at the same voltage.
One is at ground, so for the other one to be at ground, there must
be a voltage drop across the 1k resistor equal to the input
voltage. The 3k resistor has the same current across it, so the
voltage drop must be 3 times as large, by
<a href="http://en.wikipedia.org/wiki/Ohm's_law">Ohm's Law</a>, making
the output equal to -3 times the input voltage.
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Next: <a href="e-amp-noninvert.html">Noninverting Amplifier</a><p>
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