This noise limiter for low intensity signals was found in a 73 magazine for radio amateurs from the 90's. The circuit is for signals from 10 mV to 1 V amplitude.
This circuit is from an old documentation and can be used to generate signals in different...
This circuit for the automatic activation of a small lamp (or high brightness LED) was found in...
This digitally programmed gain amplifier was obtained from Signetics documentation from the 1980s....