Emitter follower (CB6811E)

This emitter follower simulator circuit was obtained in a 1964 documentation. The circuit can be designed based on a modern transistor.

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Zero Crossing Detector LM339 (CB15189E)
We found this circuit in the 1982 SGS Linear Integrated Circuits Manual. Diode D1 prevents the...
Low Frequency Doubler (CB11498E)
This circuit is from an English publication from 1976 but can be easily assembled with BC548...
2-Tone Siren (CB18189E)
Because it uses TTL integrated circuits, this siren must be powered by 5 V or as indicated with D1 to...