Звук издают обмотки.
Частота зависит от того, как настроен регулятор.
Например, если на 8кГц, то и звук 8кГц.
У меня на больших оборотах он заглушается шумом винта.
Вот например “хайвольты” не свистят,
Не свистят, но подвывают на некоторых режимах… На E-Starter е точно помню что подвывал. Жалобно так 😁…
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