Сдохла мелкосхема, есть она-же но в DIPе, работает, но размерчик не тот. SMD корпусов в России не обнаружено. Может можно чем-то заменить? Даже на Тошибе не нашёл даташита на неё, видно очень старая.
Даташит тут URL wwww.ges.cz/sheet/t/ta7761.pdf , но на счет аналогов… Многие микрухи на нее похожи, мож даже 3361 подойдет, только, по моему, проще укоротить у DIP ноги до предела и тонкими проводочками припаять к плате и приклеить.
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