This filter, found in an old manual, has characteristics of reduced overvoltage given by the graph next to the diagram. Formulas for component calculations are given next to the diagram.
The interesting circuit shown in the figure, can have its gain digitally controlled and present two...
This circuit includes the amplifier for the signals, being fully transistorized and using varicap...
The figure shows how to use a 12 V signal to trigger a TTL gate using an optical coupler. The...