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 can be used to detect the signals from the previous circuit or from any radio...
The purpose of this circuit is to maintain the polarization voltage of the base of a transistor at -1.8 V,...
This circuit is both a signal injector and a signal follower. A key selects the operating mode. The...