Electronic song circuit for acoustic signals. (Machine-translation by Google Translate, not legally binding)

摘要

Electronic sounding circuit for acoustic signaling, constituted by a modular sound generator in variable form, in which the oscillation is produced by a low frequency counter reaction in coupling with a stable high gain multivibrator, essentially characterized by the fact that the the choice of the parameters of the capacities and/or of the resistances of intercoupling for the different imitations of the song of the birds, variables in the characteristic of the singular species, is obtained by means of switches. (Machine-translation by Google Translate, not legally binding)