This circuit was obtained in a 1967 Electronics World. The components are still common today, the SCRs can be replaced by equivalents and the unijunction transistors the 2N2646.
This circuit with pressure sensor was obtained from the Encyclopedia of Electronic Circuits volume 5...
This circuit makes use of an old operational one to generate clock signals that depend on the...
This circuit was found in the August 1987 issue of Radio Electronics magazine. It was implemented with...