If output impedance of a point is a high value then
connecting another circuit at that point will load it
resulting in malfunction or error. Buffers are used as
interface between circuits. Low impedance of an output means
it can source sink lot of current, when you need 2 opamps use
LF353 or TL072 which are dual opamps.
Instrumentation and Automation - 01
A non-inv FET input is the best buffer, for inverting buffer
use high R values Using very high R values like 2.2M or higher
requires a glass epoxy PCB and guard rings around pin 2, 3 to
prevent leakage currents on the PCB reaching the PINs. Also
moisture and dust has to be prevented by using RTV coating or
Varnish. Use 78L05 79L05 for the dual supply required by this
Back to Analog Op-Amp Circuits
20th Mar 2020
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