Need 12 volt to 14 volt ac transformer

Hi I need to convert 12 volts ac to 24 volts ac for an outdoor
lighting project low amperage, say 500 ma. I am looking for a small
boosting transformer on the cheap. Any suggestions on where I can find
something like this? Alternately I could use a cheap 12 volt ac to 24
volt dc converter. Google has turned up endless garbage for me.

Thanks

 

[Skenny]

billygoat@the.farm wrote:

Hi I need to convert 12 volts ac to 24 volts ac for an outdoor
lighting project low amperage, say 500 ma. I am looking for a small
boosting transformer on the cheap. Any suggestions on where I can find
something like this? Alternately I could use a cheap 12 volt ac to 24
volt dc converter. Google has turned up endless garbage for me.

Thanks

Im not real sure it will work, but you might try a 24 volt center tapped

transformer.
Connect 12 VAC to the center tap and one outside tap.
You should get 24 VAC from the two outside taps. (I think)
You will have to hook up a transformer to test it. Also hook up a 24
volt 500 ma load to the transformer, to make sure it doesnt get too hot.
This method will not isolate the 12 VAC from the 24 VAC, they will share
a common. So you need to take this into account.
Also, you will have 120 VAC present on the other side of the transformer
(Or what ever voltage the transformers primary is rated at)so you will
need to insulate it so no one can touch it.
Also, Im not sure how much current this setup will handle, so you might
need at least a 1 amp transformer (for 500 ma). But I would go higher
than that. Since you are doubling the voltage you will at least double
the current on the 12 VAC. (Have you considered this? Will the 12 volt
supply handle it?)
You didnt say what frequency the 12 vac is, Im assuming it is 60 hertz.
The transformer will have to be rated for the same frequency the 12 vac is.

 

[DBLEXPOSURE]

Patrick Ziegler ImageQuest Photography
<billygoat@the.farm> wrote in message
news:7sou23h4sebh9rsstpqjird6vk18i9qffc@4ax.com...

Hi I need to convert 12 volts ac to 24 volts ac for an outdoor
lighting project low amperage, say 500 ma. I am looking for a small
boosting transformer on the cheap. Any suggestions on where I can find
something like this? Alternately I could use a cheap 12 volt ac to 24
volt dc converter. Google has turned up endless garbage for me.

Thanks

What is your source? Are you starting with 120VAC from an outlet? Where
are you getting your 12VAC? how much current is available there?

Skenny's 24V Center-tapped idea might work its call an auto transformer, I
think. You would need to cap of the un-used primary leads. Your 12V source
will have to have enough current available, roughly an Amp if you need
500mils at 24V. Dosen't sound very elegent though.

If you have 120VAC available, why not just get a 24VAC wall wart, (power
pack)? or an old doorbell xformer.

here is a 120 to 240 for $16. it will run nice and cool as a 12 to 24

http://www.voltage-converter-transformers.com/step-up-transformer.html


PZ
www.weisd.com

 

[jasen]

On 2007-04-25, billygoat@the.farm <billygoat@the.farm> wrote:

Hi I need to convert 12 volts ac to 24 volts ac for an outdoor
lighting project low amperage, say 500 ma. I am looking for a small
boosting transformer on the cheap. Any suggestions on where I can find
something like this?

use a centre-tapped 24v 600mA(or larger) transformer as an autotransformer,
drive half of the 24v side take output from the whole thing , leave the
primary unconnected, (but insulate the terminals)

Alternately I could use a cheap 12 volt ac to 24
volt dc converter. Google has turned up endless garbage for me.

voltage-doubler: 2 diodes 2 capacitors.


Bye.
Jasen