This is a very common circuit in the days of xenon flashes for cameras. This is from a Radio Electronics magazine from November 1965. It uses an SCR and has manual triggering.
Found in a 1968 Mullard manual, this circuit measures temperature by infrared radiation. The...
Found in a 1970s RCA documentation, this circuit generates signals according to the component...
This Harris circuit from the 90's is intended for recording old EPROM memories. The circuit uses...