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.
This circuit can be found on this website in similar versions. The power supply is given in...
We found this third-order Butterworth asymmetric filter in an old manufacturer documentation. The...
This circuit was found in a Japanese documentation of the 70's. It uses transistors of the era and is...