This circuit was found in 80's documentation from Analog Devices. The formulas for calculating the components as a function of frequency are given next to the diagram.
This configuration based on a conventional astable multivibrator was found in a 1982 publication. The...
Operational amplifiers used in this 80's circuit is not very common today, but the setting can be...
This circuit was found in an Electronic Design from 1967. The circuit uses two triacs being T2...