This two-tone decoder has a bandwidth of 24%. The circuit is from a 1994 Electronics Now. The components without the value determine the recognized frequency.
This circuit is from a 1965 Motorola documentation. The transistors are of the time as is the...
We find this circuit in a 1976 NASA handbook. The circuit can be designed based on current logical...
The deviation of characteristics of this circuit normally referred to the temperature is very low....