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 has more sensitivity than the previous one (CB4114E) for using a full-wave detector...
The frequency of this circuit can be programmed by a control voltage. The control circuit is CMOS...
Found in Philips documentation from the 1970s, this circuit uses components from the era. The...