RTD Precision Amplifier (CB21283E)

This circuit was found in documentation from Analog Devices, serving to measure temperatures from 0 to 300º C. The components are from the period.

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Electronic Crossover (CB20648E)
This circuit separates the bass from the treble in an audio signal. The circuit is from a Hands On...
Car Sound System (CB17339E)
This circuit was obtained in a 1986 documentation consisting of an active frequency divider for...
Voice Scrambler (CB22462E)
We found this circuit in a Popular Electronics from 1992. It consists of a voice scrambler used in...