Blown Fuse Alarm (CB6109E)

We found this circuit in a 1967 Electronic design. However, it can be easily implemented even today as it uses only common diodes.

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Microsecond CMOS Timer Up To Hours (CB1268E)
This circuit uses a 4020 counter that divides the frequency up to 210, being found in a former...
Single Output Current Sensor (CB5251E)
This bidirectional current sensing circuit was found in a 2005 Linear Technology application manual....
FET Preamplfier (NI022E)
This circuit is indicated to operate from high impedance sources as piezoelectric transducers....