We found this circuit in the Texas Instruments optoelectronics manual. Field effect transistors can be BF245 and bipolar BC548. The sensor is a photodiode in the photo-generator mode.
This circuit was found in a 1980s American schematic. Transistors can be modern equivalents. The...
The JFETs of this old circuit admit modern equivalents and their characteristics determine the maximum...
This circuit was found in old documentation, but it adapts perfectly to modern applications with...