Двухтональная "полицейская" сирена на NE555

Двухтональная полицейская сирена на таймерах NE555
В основе схемы лежит два таймера NE555(КР1006ви1)
Правая часть схемы это генератор звуковой частоты, выход на динамик 4-8 Ом, левая часть схемы - управление звуковой частотой.
Кт361Б либо его аналоги.
Схему можно питать напряжением от 6 до 9В (чем больше напряжение, тем выше громкость)

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Видео Двухтональная "полицейская" сирена на NE555 канала E-Station