Found in an Electronic Design from 1968 this circuit generates a linear sawtooth signal modulated by an input signal. The transistors are from the era.
This circuit was obtained in a 1991 Electronics Handbook. The publication no longer exists, but...
Mouser has a huge list of sensors for the most diverse applications such as automation, IoT,...
We found this configuration in a 1972 RCA linear integrated circuits manual. The transistor admits...