How do i convert 220v to 12v without a transformer

I have bought a few over the years and saved a few and you can find them almost anywhere heres one in an expired carbon monoxide detector...

But it sounds like the OP just wants a 12V power supply....

This is the trouble with OPs - they so often don't quite tell us what they really want

MK

Yes.. Perhaps E14 produce a learning module on clairvoyance so we can all do better

Definitely best to use a ready made 12V supply. Your water pump may draw a much higher current when it starts up than its steady state power rating might lead you to expect.

Low frequency based transformer based power supplies are often quite good at this but switchers may have trouble. Kind of hard to tell without just trying it because pumps and power supplies at the low end of the market are not usually specified in detail  in this regard.

If the water pump is small just get  a power supply that can deliver 4x the nominal pump power.

You can make the 5V with a regulator from the 12V supply, you can buy one from Amazon or Ebay if looking for cheapness. For simplicity just use a second DC supply.

MK

Water and a power supply without transformer are enemies. Go for a solution with a transformer.

I was leaning to the same point but for the motor inrush.  Use a buck autotransformer and maintain your neutral bond.  Helps to trip the breaker if something goes wrong.

thanks

DITO!!

Are you trying to kill yourself and others??  If your circuit FAILS, and WHEN, the motor will likely take the full voltage which means you have 220v on the pump motor, hence you may electrify your little system. And then don't touch it or you might DIE,  with 110 your muscles react with an open hand, on the other hand, 220 will make your muscles grab on, well you get the picture. I used to work as an electrician, and whenever when I was messing about with 220 (live) I always had an extra person holding me with a rope to my belt. or standing on a rubber mat, with rubber gloves and an apron. SO JUST Buy a wall wart.  Because I knew what I was doing I and two other guys changed out everything from the  3 Federal Pacific boxes that always ran hot (they lost their certification), to Square D and everything  was powered by 2 pole pigs (transformers) which were tied together where the boxes were. 

Your concern has merit. Being able to do it doesn't necessarily mean you should do it. I thought a 12V wall wart would solve the problem. That is the solution I opted for when the door bell PS went south. Still ringing to this day....sorry got to go someone at the door.