This circuit is from Texas Instruments documentation from the 1980s. The operatinal ones are from the era and the power supply must be symmetrical.
This circuit was found in a 1970s General Electric documentation. This circuit already used an...
A rectangular signal can be generated with the figure setting. The values given in the circle...
This circuit was obtained in an old publication. The FET can also be the BF245. The potentiometers can be...