Voice activated switch (CB8434E)

This sound or voice relay was found in a Popular Electronics. It includes an amplification stage and can be used as a shield.

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3 decades generator 15 Hz to 15 kHz (CB9195E)
This Wien bridge oscillator was found in Radio Electronics from the 90s. The circuit uses the 741...
Motor direction and speed control (CB20781E)
This circuit from a 1970s General Electric publication applies to motors of the series winding type....
One Digit Counting Module (CB785E)
This TTL module can be used in counter and many of them can be cascaded to counts up to 99, 999,...