Square to Sinusoidal Converter (CB6595E)

This circuit was obtained in an American publication of the time. Transistors are commonly used. The circuit can be adapted for use as a shield.

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Versatile Timer (CB21420E)
This circuit was obtained from an old American documentation, and practically any general-purpose transistor...
Timed Voice Photo Relay (CB17041E)
This circuit is intended for monitoring an environment. It fires a relay with a sound, but only if...
Fuse Test (CB22165E)
This circuit is from an old documentation, but perfectly current. In place of the battery, 2 or 4...