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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Pseudo random sequence generator (CB7975E)
This circuit was found in a 90s Electronic Design. The circuit is for TTL technology and can...
Telephone Amplifier (CB4553E)
This circuit is from an American magazine that no longer exists, Modern Electronics, in a February...
Telephone Amplifier (CB12861E)
This device works with conventional analog phones where the headset is a magnetic type. The signal...