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.
The setting of this power supply is only 0.1%. We found it in a 1969 US documentation. Transistors...
This circuit is based on a common cathode 7-segment display. The circuit is based on CMOS...
The existence of field effect transistors at the input of the integrated circuit (operational...