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Правильная схема подключения вот такая. Динамик подключается через транзистор. Транзистор можно использовать практически любой, NPN серии. Я обычно использую BC337, но можно использовать 2N2222. Базу транзистора надо подключать через резистор. Обычно это резистор около 1 кОм. Возможно небольшое отклонение. …
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