I almost done with my alarm system. I am using a 24volt Siren. I will be pulsing the siren for 80ms about 16 times in a minute before turning it on for a longer period.
I looked at the voltage spike and I am wondering if I need a mosfet with a 300V drain to source or perhaps 600V but the voltage is not going from the drain to the source
it is 224V during the off time so it seems the diode is not draining the spike through the siren, it is a PIEZO siren CPS-5449-105PM
I am using a MR854 fast Rec 3A 400V Diode. I was testing on a breadboard with a little 2n7000
Should I connect this with something else, I don't know if that voltage is going to be a problem, perhaps it just needs a drain resistor or something.
Driving gate with AVR pin.
L1 represents the Siren Initially I thought there was a coil but I don't think so now looking at the scope.