This volume compressor uses unusual components today. The circuit was found in documentation from the 1980s. The circuit is for audio signals. The LS150 is a high-performance operational amplifier.
This circuit was found in Radio Electronics magazine from February 1962. The sensor is an LDR, and the...
This circuit carries small batteries of Nicad that can be connected in series in number of up to...
This circuit was found in a 1967 US documentation. It shows how to build a gain control by digital...