Электронное реле времени

30 июля 2015г. - 14:08 4160 просмотров

Электронное реле времениЭлектронные реле времени изобрели, чтоб с их помощью сменить аналогичные устройства с электромагнитным, а также механическим замедлением. Сначала их производили на основе транзисторных схем. Потом уже в них стали применяться интегральные микросхемы, а далее произошел переход к микроконтроллерам.

Систематизируя все вышесказанное, можно отметить, что эти приборы являют собою оборудование, которое управляется с помощью входного напряжения и изменяет свои контакты с задержкой.

Сейчас существует множество схем электронного реле времени, принцип действия которых основывается на разряде или заряде конденсатора до обусловленного напряжения. Однако у них есть существенный минус – это нестабильная выдержка времени, причиной тому может быть старение диоламп или неисправность радиодеталей и т.д.

Можно отметить, что схема простого электронного реле времени, в отличие от предыдущих, не имеет данного недостатка и не зависит от колебаний питающего напряжения.

Схема простого электронного реле времени

Рис. 1 Схема простого электронного реле времени

Характеристика схемы такого прибора:

  • С помощью таких устройств мы можем получить отсчет времени, с точностью от 0,5%.
  • Как показывает практика, они заслужили достаточно хорошие отзывы, а также отличаются высокой надежностью.

Далее приведена схема самодельного реле времени с выдержкой до 60 мин.

Схема электронного реле времени с выдержкой до 60 мин.

Рис. 2 Схема электронного реле времени с выдержкой до 60 мин.

Это прибор, который базируется на четырех транзисторах и может использоваться, например, когда вы эксплуатируете разные электрические устройства и т.д.

Несколько полезных советов по деталям, которые понадобятся при сборке подобного оборудования или его ремонте:

  • Например, поменять резисторы МЛТ на такие резисторы, как УЛИ, ВС, МТ, БЛП, ВСа;
  • Также конденсаторы типа МБМ меняем на такие, как К40У-9, К42У-2- 500В, К75-12-630В, МБГО-500В;
  • Можно заменить конденсатор типа К52-1Б на  такие, как К52-11-25В-330 мкФ, К50- 24-16В-1000 мкФ;
  • Также заместить можно выпрямительные диоды моста типа КД202Р на КД202М, КД226Г, КД226Д, КД210А, КД203А;
  • И, наконец, можно заменить транзистор типа КП302А на КП307А и т.д.

Если устройство собрано правильно, то оно не нуждается в регулировке и готово к использованию.

Читайте также на портале myfta.ru:

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