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.
This circuit was found in a 1980s documentation but can be easily assembled even today by the...
This receiver was obtained in a documentation from the 90's and is of the super-regenerative type....
Found in a Popular Electronics from the 90s, this circuit triggers an indicator when these lights...