Field intensity meter (CB7365E)

Found in a 1966 publication, this circuit is a simple version of a field strength meter. The diode is a general-purpose germanium type.

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Temperature alarm (CB9476E)
Found in American documentation from the 90s, this circuit triggers a buzzer with a Sonalert-type...
Powerful 10 km FM Transmitter (CB18131E)
The range, of course, also depends on the antenna and local geographic conditions, remembering that there...
Multiple Feedback Band Pass Filter (CB19736E)
This circuit is based on documentation from the operational's own manufacturer, from the 80's. The same...