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<p>
This is
a voltage follower or <a href="http://en.wikipedia.org/wiki/Buffer_amplifier">buffer
amplifier</a> circuit, where the output is simply equal to the input.
The advantage of this circuit is that the op-amp can provide current
and power gain; the op-amp draws almost no current from the input. It
provides low <a href="http://en.wikipedia.org/wiki/Output_impedance">output
impedance</a> to any circuit using the output of the follower,
meaning that the output will not drop under load. The load is a 1k
resistor in this case; the op-amp provides all the current needed
to drive the load, without requiring any current from the input.
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Next: <a href="e-amp-diff.html">Differential Amplifier</a><p>
Previous: <a href="e-amp-noninvert.html">Noninverting Amplifier</a><p>
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