Based on Texas Instruments documentation, this circuit serves for sensor interfacing. The circuit is based on the LF411, but other operational ones can be used.
April 2017 - Texas Instruments bq51222 integrated circuit for chargers and other Qi wireless power...
Using two 567 PLLs, this circuit recognizes two audio tones in sequence providing a signal for a...
This solar powered circuit was found in a 1991 documentation. The transistor is a general purpose...