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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Biestable Touch Switch (CB10246E)
This circuit is from an English magazine of 1977. The circuit is still current, just using BC547...
Beat Frequency Oscillator (CB1407E )
Connected to a shortwave receiver, this circuit is intended to enable the decoding of signals in...
SCR Synchronized triggering (CB21544E)
This circuit was found in an Electronic Design from 1968. Its purpose is to produce synchronized trigger...