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'[EE]: Power Supply question'
2004\01\03@191118 by rad0

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face
I'm a little bit stuck here trying to move from my hobby board to the real
world.

I want to put a little pic circuit board on an electrically actuated ball
valve.

And there are several types or ways of powering these valves, from high amp
12 vdc, to 24 ac to 110 and 220 vac.

First I thought I would use 12vdc, and use a hefty wall wart.  But here you
end
up needing upto 3 or 4 amps.  And this I don't quite see how you could do on
a circuit board.  Yes/no ??

The 110 vac valves seem to use very little amps.  So maybe this is more
appropriate.  But how do you mix ac from the wall and 5vdc for the pic?
I guess I need a power supply.

This is where I have practically no knowledge.

I would like to have something that I can plug into the wall that will
give me 110 vac for the valve and 5vdc for my pic.

Say I want to build this from scratch.  I will need a transformer and then
rectify the stepped down ac into dc.

(Or can you just buy something like this in one package?  What value
would I need for my pic circuit, pretty much the pic and a relay?)

Is there a streamlined modular way to do this? Or do you still need
to build a wheat stone bridge and fiddle around with all this stuff.

Oh yeah, I want it to be very small and compact to fit in a little box
on top of the valve.

Is it true that because the pic circuit requires very little amps that I
can use a smaller transformer?  Do you need more windings for more
amps?


Any links, tips, references,  appreciated.

Thanks

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2004\01\03@192326 by Jinx

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> First I thought I would use 12vdc, and use a hefty wall wart.  But here
> you end up needing up to 3 or 4 amps.  And this I don't quite see how
> you could do on a circuit board.  Yes/no ??

Yes

> Oh yeah, I want it to be very small and compact to fit in a little box
> on top of the valve.

A conventional transformer supply for 4A would be quite large.
Even a switchmode could be fairly large and possibly troublesome
to make and test if you've little experience

> The 110 vac valves seem to use very little amps.  So maybe this
> is more appropriate

It does mean that you'd need no components at all to get a supply
for them, as it's already there at the wall

>  But how do you mix ac from the wall and 5vdc for the pic?
> I guess I need a power supply

And an opto-coupler + triac as the interface

> I would like to have something that I can plug into the wall that will
> give me 110 vac for the valve and 5vdc for my pic.

http://home.clear.net.nz/pages/joecolquitt/txless.html

Be careful !!!!!!!  And be aware of any electrical regulations that
may apply

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