This circuit was found in a 1967 documentation. It is intended for triggering a xenon LASER. Observe the high operating voltages of the circuit. The components used are uncommon today.
This circuit for analog video signals was found in a March 1988 Radio Electronics. The Maxim...
The UAA170 integrated circuit is not very common today. This project is for a 303 Circuits from the...
This circuit, from a 1994 publication, shows how to polarize a phototransistor to receive...