The frequency of this circuit, for the indicated components, is 1 kHz. Other operational amplifiers can be used, and 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...