This small signal amplifier circuit was found in Motorola's 1969 documentation. The FET and the transistor can be of any type and is battery powered since the consumption is very low.
Found in a 1980s publication, this circuit uses an operational amplifier from that time. The...
This circuit was published in an Italian magazine Radio Elettronica in February 1976. The...
This constant current circuit was found in the October 1993 Electronics Now magazine. The current can...