Moisture Detector (CB22075E)

The basis of this circuit is an LM380 that drives a speaker that emits sound when moisture is detected. Note the use of a medium impedance speaker.

FET Crystal Oscillator II (CB19849E)
This configuration reaches a few tens of megahertz depending on the crystal and the FET....
TLV354x CMOS Operational Amplifiers (COM179E)
January 2017 - The new Texas Instruments TLV354x series of operational amplifiers with 200 MHz...
Fast peak detector (CB20893E)
This circuit was found in a National Semiconductor manual from the 1980s. The integrated circuits used...