Power supply

[hamdi.tn]

that's what you need 

[abdullahseba]

What's wrong with something like this?

http://www.ebay.co.uk/itm/Delta-DPS-1200AB-A-1200W-Power-Supply-TESTED-/200732965696?pt=US_Server_Power_Supplies&hash=item2ebc9dfb40

The copper in a 50/60 Hz transformer would probably cost you more.

i decided that the rectifier/Smoother will cost about the same as 2 of these http://www.ebay.co.uk/itm/DC-12-24V-Universal-Regulated-Switching-Power-Supply-Transformer-for-Strip-CCTV-/281369376012?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&var=&hash=item4182ebf50c
we have a toroidal transformer already which we got custom made for £180
i might sell it or use it for something else like an led with no resistor

[abdullahseba]

interesting, must be very challenging to refurbish. any pics?

i will put up a link soon

[abdullahseba]

interesting, must be very challenging to refurbish. any pics?

interesting, must be very challenging to refurbish. any pics?

i will put up a link soon

here is the link the. tags will describe the picture
 http://1drv.ms/1qZXV2c

[Macbeth]

Hacking up chucked away MOT (Microwave Oven Transformers) is a good way to get lots of amps for cheap/free. Chisel away the EHT windings and replace with some nice heavy gauge windings instead. Making a decent high amp PSU out of them is another matter, but very do-able. 

[Richard Crowley]

But you can't expect to get 1000W out of a typical domestic microwave transformer. Especially not continuous.

[abdullahseba]

hmmm but this will be open to public viewing, will relevant authorities approve of DIY PSU? power blocks may not even have enough safety certifications too imo, if they are the overly cheap types ... yes? he does need to adhere to certain electrical code no ? (sleepy ... i think my english is ... %$#@#)

if they don't the will have to make do with a lead acid battery that might spill
we are thinking about having the electrics tested , currently we only allow the public on the train if there is someone there 

[Marco]

we have a toroidal transformer already which we got custom made for £180
i might sell it or use it for something else like an led with no resistor

Decent fit for a class A transistor room heater/amplifier, try some audio forums?

[Richard Crowley]

we are thinking about having the electrics tested

If you are having the unit professionally tested for approval by the authorities, it will cost far far more than just buying a commercial unit (which has already been tested and approved). 

I love making DIY solutions for whatever is possible. But IMO, this is NOT the place for a DIY solution.  It is in a public place, and it is high-power. And abdullahseba doesn't appear to have the knowledge and experience required to create a circuit like this.

[Macbeth]

But you can't expect to get 1000W out of a typical domestic microwave transformer. Especially not continuous.

I'm not so sure on that. I mean my microwave has a continuous 950W output as it is. This guy claims to get 800A - though for spot welding rather than continuous