This amplifier circuit with gain between 0 and 96 was found in the December 1983 issue of Radio Electronics magazine. The power supply must be 15 V.
Using components from the era, this 90's EDN circuit is used in analog to digital conversion...
Found in an American publication from the 90s, this circuit allows the supply of 3, 6 and 9 V...
We found this circuit in an old Popular Electronics. The circuit is experimental, driving an LED...