Ziginox wrote: ↑Thu Apr 02, 2020 8:25 pm
Zarlog wrote: ↑Thu Apr 02, 2020 7:12 pm
It's not an 8 port siren since they have 50 hz power. it's more likely 10 ports or something like that.
That won't matter if it's a DC motor siren run from an inverter, though.
Listening to the recording again, the windup leads me to believe it's an AC motor. Typically, sirens with DC motors have a more logarithmic windup pattern where it slows down as it reaches the highest pitch, while AC sirens go straight up to the peak pitch (which, personally, I believe is much more startling and alarming).