[GreenKeys] inexpensive loop supply transformer wanted

[paul]

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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