This digital signal attenuator was found in a 90s Electronic Design. The circuit operates at frequencies that are determined by the characteristics of the attenuator circuit.
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...