Crystal converter (CB7327E)

This circuit was found in a Popular Electronics from the 90's. The circuit can be used to convert signals to frequencies up to 25 MHz.

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Tunnel diode simple noise generator (CB23705E)
This circuit was found in Radio Electronics magazine from November 1960. The circuit is powered by a...
Bidirectional Power Voltage Follower (CB16231E)
In the figure we have an application in which the input and output voltage are equal, with the...
Telephone Line Tester (CB21266E)
We found this circuit in a Radio Electronics from the 90s. The circuit is for conventional analog...