Blown fuse alarm (CB8967E)

We found this circuit in a 1980s documentation. The circuit uses general purpose transistors, triggering an LED indicator.

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Oil change computer (CB6373E)
This electrochemical circuit monitors the conductivity of the oil indicating when to change it. The...
Active low pass filter (CB20938E)
Found in old American documentation, this filter has a 8 dB per octave attenuation. The formulas for...
DC Control for Triac (CB1307E)
By the characteristics, this circuit can be used as command of triac by direct current, which is...