This is a traditional 741 configuration with gain close to 100. We found it in the December 1972 Radio Electronics magazine. The power source must be dual.
This circuit has an interesting application. If a device with the selector switch in the 110 V...
This simple radio circuit was obtained in a Japanese publication in 1967. The circuit uses...
This circuit was found in a Popular Electronics from the 90's. The components used are common and...