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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X-ray detector (CB24101E)
This circuit was published in a January 1971 issue of Radio Electronics to check television...
Infrared receiver for single tone (CB20982E)
Found in Popular Electronics from the 90's, this tuned to infrared modulated receiver uses a PLL....
Old Integrated Amplifier (CB6159E)
This 1967 General Electric circuit makes use of an array of 3 (integrated) transistors for an...