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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Product detector (CB9684E)
Found in Motorola documentation from the 1980s, this circuit employs an integrated device from...
5 mA Essimeter (CB13701E)
This signal strength meter (S-meter) was found in a 1975 amateur radio publication. We can use...
6 V Dynamo regulator (CB13007E)
The circuit shown in the figure is indicated for alternative energy sources, such as those...