[GreenKeys] inexpensive loop supply transformer wanted

[COURYHOUSE at aol.com]

Jim -   yes. transformers are still cheap in the junk  boxes  at  ham  
fests  or sometimes  free if they do   not   want to  take them home afterwards! 
  <grin!>
 
Ed#  Kf7RWW
 
 
In a message dated 12/21/2013 8:54:03 A.M. Mountain Standard Time,  
w0eb at cox.net writes:

These  are getting harder and harder to find.  One solution I've used in 
the  past was to pick up a couple of 120 to 12 volt, 2 amp filament or power 
supply  transformers.  Connect the 12 volt secondaries of the two 
transformers  together.  T1 will step down to 12 volts from 120 and T2 will take that  
12 volts back up to 120.  AC in to one primary and take the 120 out for  the 
loop supply from the other primary.  Kinda hokey but it does work and  
120:12 volt transformers are still pretty cheap from lots of  places.

One in particular I use a lot is Marlin P. Jones associates out  of Florida 
someplace.  Their website is www.mpja.com

Jim -  W0EB

> I'm working on a small project to have a Single Board  Computer such
> as a Raspberry Pi or Arduino drive my TTYs (Model 15 at  45 WPM and
> a 28 RO at 75 WPM) with some canned messages from  memory.  As part
> of that effort I'd it to have it's own loop  supply (120VAC to
> 120VAC isolation transformer, bridge rectifier,  filter cap, 2800
> ohm 20 watt limiting resistor).  Does anyone  have suggestions on
> where I might find a low cost isolation  transformer for this
> purpose?
>
>
> Paul Newland,  ad7i
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