This old fashioned transistor amplifier was found in a publication of the year 1958. Transformer are the critical components in the circuit and power comes from 6 D cells.
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...