This static switch or triac contactor was obtained from Philips 1969 documentation. The SCR is from the era, but modern equivalents depending on the load can be used.
This small signal-following amplifier uses an integrated one that is not very common nowadays. Powered...
This is one of many versions of the double T oscillator that the reader can find on this site...
This xenon lamp circuit, also a stroboscope, was found in the May 1996 issue of Electronics Now...