120v AC to multiple 12v DC?

[Robot]

This is my first attempt at wiring electronics, and my first post here, so I apologize in advance if my question doesn't make any sense.

So I'm trying to create a little machine that has ten separate 12v DC components, and I'd like them all to be powered via a single 120v AC wall plug and a single on/off switch.
(I also attached a little diagram showing what I'm trying to do)

My questions are:
1. What would be the best and safest way to do this?
2. Should the on/off switch come before or after the conversion from AC to DC? Or does it not matter?
3. When a current is split up between multiple components, is it split equally between all of them?

Edit: I actually meant six components total, not ten. One small air pump and five thermoelectric cooling/heating plates.
http://www.amazon.com/gp/product/B00E4GY0FC/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1
http://www.amazon.com/gp/product/B009X6ADCM/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

 

[Arouse1973]

You need a power adaptor. What current are you expecting the circuits to draw?
Adam

 

[Robot]

You need a power adaptor. What current are you expecting the circuits to draw?
Adam

One of the components is 30A and the rest are all 5.8A

 

[davenn]

One of the components is 30A and the rest are all 5.8A

so you have 5 rails of 12V and each one needs a max of 5.8A ?
and another 12V rail drawing 30A

are these 5 rails really drawing up ~ 5A each ?
if they are really drawing as much as 5.8 A each then the total current for that = 29A
the supply would have to be capable of ~ 35A so as not to be working at max capability
then you have another 30A rail needs to be ~ 35A capability

So now we have a 12VDC supply capable of 70Amps !! that's a hefty PSU
not impossible, but DEFINATELY NOT a first project consideration!! specially when there's mains power involved

for your safety and LONG LIFE
I suggest you do some googling for commercial 12VDC 70A PSU's SMPS ( Switchmode PSU types)

awaiting your clarifications

Dave

 

[Robot]

I think those amp numbers are correct, based on the amazon pages I bought them from.

Essentially, I'm just trying to power five thermoelectric plates:
http://www.amazon.com/gp/product/B00E4GY0FC/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1

And one air pump:
http://www.amazon.com/gp/product/B009X6ADCM/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

With a single wall plug. Am I in over my head here?

 

[Robot]

Ohhh, I assumed those were the amps required, but I now see those are the max rated amps for each device...
How do I determine the recommended or required amount?

 

[davenn]

I think those amp numbers are correct, based on the amazon pages I bought them from.

Essentially, I'm just trying to power five thermoelectric plates:
http://www.amazon.com/gp/product/B00E4GY0FC/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1

And one air pump:
http://www.amazon.com/gp/product/B009X6ADCM/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

With a single wall plug. Am I in over my head here?

yes ... its a really major project

as I suggested earlier do some searching for a commercial 12V 70A PSU preferably SMPS type for small size and low weight

Dave

 

[davenn]

Ohhh, I assumed those were the amps required, but I now see those are the max rated amps for each device...
How do I determine the recommended or required amount?

the required current is what is written on the label of the devices in question


Dave

 

[Robot]

Thanks for helping me learn this stuff.
I feel pretty silly though, I completely misread the amperage for the pump, the max is actually 350mA.
I looked up the SMPS you mentioned, but after a little research I think those are beyond my experience level and price range. Instead I might just buy a power strip and have each plate use a separate 120vac to 12vdc 5a converter, and try to pack them all into a discreet-ish box. It's kind of a ghetto solution, but it should work I think.

 

[davenn]

OK so knocking out the additional 30 amps helps lots
you would get away with a single SMPS rated at 12V and ~ 35 Amps
or even a couple of 12V 15A ones

its going to be much nicer, cheaper and more compact than a mass of plugpacks
6 amp plugpacks may be really hard to find

You didn't answer my earlier question on what the current was as noted on the cooler/heater label ??

Dave

 

[Robot]

OK so knocking out the additional 30 amps helps lots
you would get away with a single SMPS rated at 12V and ~ 35 Amps
or even a couple of 12V 15A ones

its going to be much nicer, cheaper and more compact than a mass of plugpacks
6 amp plugpacks may be really hard to find

You didn't answer my earlier question on what the current was as noted on the cooler/heater label ??

Dave

That's good to hear, this project is slowly becoming more feasible.

The thermo plates are still in the mail, so all I can see right now is what's listed on the amazon page, which only lists the input max at 5.8A.