This sensor circuit for currents of the order of nanoamperes was found in an American documentation from the 1980s. The components are from that time.
This circuit was found in General Electric documentation from the 1980s. The circuit uses couplers...
We found this circuit on Motorola's 1993 Linear Interface ICs. Equivalent operational amplifiers can be...
The circuit in the figure is based on an LM101A; diodes can be replaced with equivalents. The...