Filter analyzer (CB8227E)

Found in a 90s Popular Electronics, this circuit is interspersed between the filter and the oscilloscope input for analysis.

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Toy Organ (CB5345E)
This vibrato circuit appears elsewhere on this site. The circuit is from an old American...
Oscillator with the 567 (CB5921E)
In the figure we have the way to implement an adjustable active cycle oscillator using PLL 567....
Stair signal generator (CB9144E)
This circuit was found in a Popular Electronics from the 90s. The circuit uses common components...