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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Variable Frequency Notch Filter (CB19692E)
This circuit can be implemented with almost any operational amplifier. For the circuit shown, the...
Code practice oscillator (CB8976E)
This circuit was found in a 90s American documentation. The circuit uses still common components...
5, 6 and 12 V Fixed Power Supply (CB18643E)
This power supply uses integrated voltage regulators for 1 A of the 78xx series. The output...