Found in a 90’s HAM Radio, this circuit is used for an optical communications system or even audio transmission by optical fiber. The components are common.
The figure shows how to implement an overtemperature sensor with the Norton LM3900 amplifier. The...
An excellent signal generator for the audio track was found in a 1983 documentation. Its complete...
This circuit is used as a magnetic field sensor and is based on a Texas Instruments HaII Effect...