The input impedance of this module is very high, if U1 is
OP07 it is in mega ohms, use CA3140 or LF356 fet input opamps
to get 1 tera ohm input impedance, but for high gains OP07 is
better as it is ultra low offset, this is a good amplifier for
sensor outputs, as in a DC Circuit.
The zener diodes protect the opamp inputs, R1 limits current
during high voltage inputs and R1 and C1 form a filter to
remove ac components C1 should be a plastic type as ceramic
and electrolytic caps are leaky. A large C1 will slow the
response time, the sum of Ri + Rf should be greater than 5k so
that output is not loaded. also do not connect output to
voltages more than vcc/vdd it will blow Opamp.
These are various web widgets i developed a decade ago. These were tutorials in Electronics and Technology. It also demonstrates usability issues in small devices and using JS-CSS-Ajax in a Innovative way to make GUI dynamic, interactive and contextual. Some of the Ideas were the first of its kind in the GUI design.More Opamp Simulations
20th Mar 2020
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