The maximum frequency of this circuit is 500 kHz. We found it in a documentation for radio amateurs from the 1980s. The integrated circuit used is uncommon today.
This circuit is from a 2005 Linear Technology publication. It converts current into load sensing...
This simple measuring bridge allows the capacitance m of some pF to microfarads to be measured...
Found in a book on transistors from 1954, this circuit can modernly be used as a relay shield. A 1k...