I found this circuit on a December 1976 Radio Elettronica. The Italian magazine no longer exists, but with the replacement of some components the circuit can be easily assembled. For example, we replace BC178 with BC549 and BC108 with BC548. For 2N1711 (if not found) we can use a BD135. Instead of battery, the circuit can be powered by source, with advantages. The wires between stations should not be more than 15 meters long.
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