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621
They make you ghey. [Always wear your SC protection gear.](https://poal.co/static/images/f6b6b636a6b4a56d.png)
[–] 1 pt

Without cheating by web search, 400Hz is used in aerospace and railway applications, right?

[–] 1 pt

Mostly Military because 400Hz allows you to use smaller cores in transformers and things, but it shows up in other weight-critical applications.

[–] 1 pt (edited )

Huh, I thought it was somewhat common in railway too. Pretty sure we made some parts for that application but it's been a while, I might be misremebering. I'll ask my co-worker, could be for auxiliary equipment.

Yeah, higher frequency, smaller cores. We know the drill from SMPS. It felt quite weird when the wall warts' weights changed from a pound to three ounces at higher output wattage.