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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Video Buffer (CB25509E)
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The circuit shown is a commercial electronic voltmeter sold in Japan in the 1960s. The circuit is fully...
High Frequency Switch (CB6007E)
This 80's circuit can be implemented with modern equivalent FETs with lower on resistance. The...