Antenna tuner (CB7459E)

Found in a QST from the 90's this circuit is suitable for the medium and short-wave range.

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Tone Burst Repeater (CB3959E)
This circuit has been found in older telecommunications documentation. The circuit switches off after...
Sine to square converter (CB7330E)
Obtained in a Popular Electronics from the 90s, this circuit converts sinusoidal signals up to a...
Traffic Light (CB21013E)
This sequential relay actuation system circuit for traffic lights was found in Electronics Now...