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Buffer amplifier
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<p>In <a href="/facts/Electronics/E4JhgISq">electronics</a>, a buffer amplifier is a <a href="/facts/Unity_gain/CWbehg27">unity gain</a> <a href="/facts/Amplifier/pnRgxncC">amplifier</a> that copies a <a href="/facts/Signal/41YqUJ8c">signal</a> from one <a href="/facts/Electrical_network/zt94kTW0">circuit</a> to another while transforming its <a href="/facts/Electrical_impedance/I06NSXtN">electrical impedance</a> to provide a more ideal source (with a <i>lower</i> <a href="/facts/Output_impedance/80brK3Cv">output impedance</a> for a voltage buffer or a <i>higher</i> output impedance for a current buffer). This "buffers" the signal source in the first circuit against being affected by currents from the <a href="/facts/Electrical_load/IX0XBAqB">electrical load</a> of the second circuit and may simply be called a buffer or follower when context is clear. </p>