This configuration that appears in other points of this section was obtained in a 90’s Popular Electronics. The circuit can be applied to other operational ones.
In this circuit the CA3140, an operational amplifier, is used as a comparator with the zener diode...
The voltage gain of this amplifier is 10 times. This gain is given by the relationship of values...
This circuit is intended for the use as modulated light signals from digital sources. The circuit...