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adrian_btoday at 12:46 PM1 replyview on HN

Yes, but those normally just convert the electrical oscillations to sounds, they are not parts of the oscillators that determine the audible frequency.

In the past, audio RC oscillators or LC oscillators were used, with the former being preferred as the latter required too bulky inductors to reach so low frequencies.

Nowadays, it is usually simpler to not use any audio oscillator, but to use some microcontroller that divides the frequency of its clock until reaching the desired audio frequency.


Replies

jacquesmtoday at 12:54 PM

Those can make sounds at other frequencies but they are very loud on their resonant frequency. Loud enough to damage your hearing if you're unlucky.