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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Digital Voltmeter (CB18145E)
To use the instrument for AC measurement, the tips are A and B. For CC use tips A or B for...
CMOS Amplifier +1 and -1 Gain (CB15751E)
The interesting circuit shown in the figure, can have its gain digitally controlled and present two...
Three Transistors MW Radio (CB12261E)
This simple MW radio was found in a 1975 publication, but it can be mounted with BC548...