The S-meter is a signal strength meter used in communication receivers. This circuit was found in a 303 Circuits from the 90s, European publication.
This circuit using an operational amplifier was found in old American documentation. It can be...
This circuit was found in an English publication from 1989. The integrated circuit is an...
This amplifier, with germanium transistors, provides a power slightly less than 1 W at a load that...