This circuit is from National Semiconductor using an LM11, which is uncommon nowadays. The circuit can be implemented with other operational ones.
We found this circuit in 1980s documentation. It can be used independently as CW or by exciting a...
Found in an 1868 Mullard documentation this circuit has a dynamic range of 10 Hz to 25,000 Hz....
This circuit was found in RCA documentation from the 90s. It consists of a power control for a...