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 is from an old documentation. However, it can be mounted with modern equivalent...
We find this circuit in 1975 documentation. The circuit can be used with other operational...
This circuit is from a1970 documentation. R1 may have 10k and P1 47k. The transistors can be BC558...