[GreenKeys] Loop power supplies

[Jordan Spencer Cunningham]

For those of you who have aftermarket ~120-150v DC power supplies for your
loops, can you share where you got them? If something is commercially
available at a reasonable price, I will elect that route, but I'm still
interested in custom designs. I've read of a very simple one I may try if
nothing else.

I have an original 20ma loop power supply built into my Model 19 table, but
I'd like to get more compact versions for mobility's sake. Plus I'd like to
be able to operate more than one loop at a time.

I've been doing research on regulated supplies from parts stores like
DigiKey, Jameco, and Mouser, but there's unfortunately not much that meets
the necessary criteria that I've been able to find. Acopian makes more
obscurely voltaged supplies like this, but not for less than $200.

Thanks much.

--Jordan
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