Modulated infrared emitter (CB7251E)

Found in a 1968 Mullard manual, this circuit can function as an infrared audio link. The transistors can be the BC548.

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Current and voltage regulator (CB8129E)
Found in a Popular Electronics this circuit has double regulation. The integrated circuits used...
Class AB Stages without Dual Source (CB25705E)
Suggested by an Electronics Now magazine from April 1994, these circuits can be used as output...
Simple Burglar Alarm (CB4802E)
This simple SCR alarm circuit was found in an old Poptronics, but can be easily assembled as all...