Recording and playback circuit with ISD1000A (CB7441E)

Found in an Electronics Now from the 90s, this application uses an integrated circuit from the hard times to find today.

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Notch Filter (CB12169E)
This filter that rejects determines frequency (notch) was found in a Popular Electronics of 1993....
400 MHz RF isolation amplifier (CB8639E)
This circuit operates with frequencies from 0.5 to 400 MHz. We find it in a 90’s NASA...
Transistor dummy load (CB22476E)
This circuit for adjusting sources simulating a load was found in a publication from 1993. The...