Re: I need a 12V 3 amp regulator.....small



Yea, Weller has a 24 VDC soldering iron. Thats' the way to go! But
those three soldering irons are AC powered soldering stations! It may
be that the actual pencil iron connected to it is 24VDC. Guess I need
to call Weller, as a Google search hasn't turned up the P/N for this,
and there isn't one for sale on eBay. thanks, Geronimo


On Mon, 26 Feb 2007 02:55:47 GMT, Ross Herbert
<rherber1@xxxxxxxxxxxxxx> wrote:

On Sun, 25 Feb 2007 15:11:54 -0600, geronimo <Jamesw@xxxxxxxxxxxxx>
wrote:

I want to use a 12volt soldering iron on aircraft repairs. The
aircraft voltage is 24 VDC. There is a cigarette-lighter type
receptacle in cockpit, but of course it is 24 VDC. This is what I
need
to plug the soldering iron into. A typical one is 30 watts, so that
is about 2.5 amps it will draw. So I need a very small 12V
regulator
in plastic box. I think a 7812 regulator would work, with one series
pass transistor. Should I rate the transistor for 2x expected
current
? Are there schematics on-line somewhere...or maybe a ready built
regulator box available already?


You could simply use a 24V soldering iron. Weller WTCPN, WTCPS and
WTCPD soldering pencils are usually 24V and their "Magnastat"
operation ensures temperature control based on the tip used.

You could also use a 24V to 12V smps step-down converter such as
http://www.rpc.com.au/catalog/voltagereducer24vto12v8amp-p-400.html
with your current model 12V soldering iron. Most alternative energy
supply stores will have a range of 24V to 12V adapters to suit most
applications.

One way or another, even if you have the ability to build a suitable
PSU yourself, it is going to mean a reasonable cost outlay whichever
way you go.

.

Quantcast