This circuit is from a Radio Electronics magazine from July 1979. It uses the well-known IC 7107, a liquid crystal exciter that became popular in circuits of this type at the time.
This circuit with 5 times gain was found in European documentation from the 1980s. The input and...
Suggested by Siliconix documentation from the 90's, this circuit uses power MOSFETs according to the...
Other operational amplifiers can be used on this unit gain amplifier. The circuit is from the 1993...