Занимательная электроника. Нешаблонная энциклопедия полезных схем. Андрей КашкаровЧитать онлайн книгу.

использования оптопар с открытым оптическим каналом (например, датчик пульса, охранные системы инициализации и др.).

1.5.1. Второй вариант сигнализатора почты в ящике или смещения иного предмета

На рисунке 1.21 представлена новая электрическая схема для подобных устройств. Ее прототип – специальный прибор охраны денежных знаков – использовался длительное время в антикриминальной системе безопасности кассиров и контроля в банках и крупных торговых точках. Но все же устройство на рисунке является радиолюбительской разработкой, хотя и имеет в себе все функции специального охранного узла.

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