Oil change computer (CB6373E)

This electrochemical circuit monitors the conductivity of the oil indicating when to change it. The circuit is from an 1967 American documentation.

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Broadband Amplifier (CB6123E)
This circuit amplifies signals from 0.5 Hz to 300 kHz. We found it in an old documentation. Equivalent...
Constant Current Source for SMA (CB1244E)
In the figure we have a constant current source for Shape Memory Alloy or (Nitinol). The value of...
Current Sensor 0 to 33 A (CB5385E)
This filtered High Side sensor circuit was found in a 2005 Linear Technology application manual....