2-way intercom (CB23561E)

This circuit was found in Radio Electronics magazine from June 1958. The maximum distance depends on cable losses. More stations can be added.

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Micro AM Radio (E/P) (MIN020E)
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Two-Tone Buzzer (CB24121E)
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Push Pull stage OC19 (CB18855E)
This counterphase output step was obtained in a Japanese magazine of 1957, a time when the...