Pre selector with varicap tuning (CB9172E)

This circuit for the medium wave range was suggested by a Popular Electronics from the 90s. The double port MOSFET is an unusual component today.

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Digital Bargraph Indicator (CB14703E)
This circuit indicates a digital value through a moving bar. The circuit is TTL and must be...
Busy line indicator (CB9111E)
This circuit was found in an Electronic Engineering of the 80s. The circuit indicates when a...
Operational with Increased Band Pass Range (CB13219E)
This configuration is from an old Motorola publication from the 70s. In it we have the way to...