We found this circuit in a magazine 73 for radio amateurs from the 80's. The circuit makes use of an epochal component which is programmed according to the table beside the diagram.
Using a 12 V transformer, this unit can provide a much higher output voltage. The circuit is from a 90’s...
The transistor on this mixer can be any general-purpose transistor. The number of entries can be...
In the figure we show the typical configuration of a shared line using a twisted pair where the...