= LM741 Operational Amplifier by Texas Instruments
{c}
{tag=Work by Texas Instruments}
{title2=SNOSC25D}
{title2=2015}
Manufacturer's data sheet, revision D, October 2015.
https://www.ti.com/lit/ds/symlink/lm741.pdf
Section 6.5, p. 5, gives typical <input impedance> $2\,\mathrm{M\Omega}$ at $25^\circ\mathrm C$ and typical large-signal <voltage gain> $200\,\mathrm{V/mV}$. Section 7.4.2 describes closed-loop feedback. These are device-specific examples for interpreting a real <operational amplifier>.
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