Found in old documentation, this receiver for the mid-wave range uses transistors from the era. In fact, modern general-purpose equivalents can be used.
This simple operational amplifier tester was published in the November 1987 issue of Radio...
This squelch or silencer for receivers for the 11-meter band was found in the November 1971 issue...
This reader with TTL logic compatible output uses an LM139 comparator. The circuit was found in...