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Голосование

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Для любителей чего-нибудь попереключать, хлопая в ладоши или погромче крикнув, предлагается следующая схема:

 

 

Основной плюс этой схемы - применение для коммутации нагрузки не тиристоров или симисторов, как обычно, а полевых транзисторов. Прежде всего, это отсутствие ипульсных помех, которые так любят создавать тиристоры и симисторы. Ну и поскольку сопротивление канала открытого полевого транзистора ужасно мало (порядка 0,5-0,6Ом), он гораздо меньше греется и позволяет обходится вообще без радиатора при мощности коммутироемой нагрузки вплоть до 250...300 Ватт.

Остальное - как у всех подобных переключателей. Звуковой сигнал, поступающий с микрофона усиливатеся транзистором VT1 и переключает триггер на микросхеме DD1, который, в свою очередь, управляет полевыми транзисторами.

Цепочка R3C3 формирует небольшую временную задержку переключения триггера и таким образом увеличивает помехоустойчивость схемы.

 

Микросхему можно заменить на отечественную К561ТМ2, соединив при этом её выводы R и S с общим проводом. Выходные транзисторы можно заменить на IRF840. В качестве микрофона сгодятся пьезоизлучатели ЗП-1 или ЗП-3.

И, как уже отмечалось выше, если мощность нагрузки не превышает 300 Вт, транзисторы можно не ставит на теплоотводы. Если же она все-таки выше, то радиаторы прикрутить все-таки надо.

 

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