Вот, может кому-то будет полезно. Перипетии и разборки - тута vri-cnc.ru/modules.php?name=Forums&file=viewtopic&… В архиве отлаженная и проверенная версия. Есть режим рабочего тока и тока удержения. Реализовано без Enable. 555 таймер анализирует наличие импульсов step, и при их отсутствии в течении нескольких секунд, переводит драйвер в режим удержания. На 2-х транзисторах собрана схема индикации режима. Можно не ставить, просто место на плате было. Но моргает красиво. Сейчас пытаюсь слепить некий “одноплатник”, с БП и опто на одной плате.
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