Wawa:
Scary story. Don't do anything stupid like this.
Things connected to the mains need galvanic isolation.Linear/resistive dropping to get 24volt/2Amp from 230volt AC could generate about 600watt in the transistors.
You would need a fan-assisted heatsink the size of a shoebox to keep things cool.Buy the eggs (24volt switch-mode supply).
Leo..
thank you VERY much Leo!that was my "Problem" aka "How hot the mosfets will get"
I tried to calculate the heat dissipation myself but i have a hard time reading the transistors thermal graphics from the datasheets.After a bit more reading I realised that basicly the transistors will act as resistors but i was hoping it will be easyer to dissipate heat across transistors because they can be installed on heatsinks.I decided to go with a "off the shelf" power supply.
One more question :
The ebay 5 V relay boards...are they safe to switch a load of about 1500 Watts?!?they are rated at 250VAC at 10 Amps?By my understanding,if i connect a socket plug to a relay and the relay to the 1500W load,there will be a constant flow of 240 V and 6-7 Amps inside that small relay..are they safe to use in this conditions? at about 1500 Watts?
The load is heater that will start sometime in the morning and remain on untill late at night,so I assume the relay will be under a lot of stress(constant 240V@6-7 Amps for about 20 hours/day)..is it safe to proceed with something like this?!