The circuit shown in the figure can be designed with more modern operational amplifiers, as it is from 1994 documentation by National Semiconductor. The power supply must be symmetrical.
This oscillator can use inverters or connected AND or NAND gates as such. The signal produced with...
This project, found in a 1981 documentation, consists of an interesting adaptation of the test...
This 1970 circuit triggers a load when it receives a signal. Components are common and SCR admits...