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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NAB Operational Equalizer (CB24228E)
Intended for use with signals from tape recorder pickups, this circuit was found in the December 1972...
Voltage regulator (CB20299E)
In the figure we have the configuration of a voltage regulator with 3 transistors. The components depend...
a Telephone dialer (CB10147E)
This circuit was found in an 80s documentation. The integrated circuit used is from that time,...