I found tis circuit in na old documentation from 1958. The circuit uses germanium transistor availble that time and hard to obtain today. The circuit is indicated for phono applications using variable reluctance transducer.
We can implement this filter with more modern equivalent operational amplifiers, since the LM110 is...
This is the transmitter for the previous circuit. We found it in a 90s Electronics Now. The...
We have already presented this circuit, obtained from manuals from other manufacturers of the used...