Blown Fuse Alarm (CB6109E)

We found this circuit in a 1967 Electronic design. However, it can be easily implemented even today as it uses only common diodes.

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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...