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 filter, found in an old manual, has characteristics of reduced overvoltage given by the graph...
This circuit is from an American publication from the 60's. The power is on the order of 600 mW....
One 40108 Schmitt inverter or one 4093 gate can be used as a half monostable to be triggered by...