[GreenKeys] Loop power supplies

[drlegendre .]

120V at 4A.. good grief that's overkill.

Bear in mind that the 120v / 60mA spec is for running very long loops, like
on the order of miles. Running a loop around a room or even a whole house
should be possible with a 12V or 24V wall-wart (and 200R / 400R resistor).
That high 120V spec is to deal with the inductance imposed by long lines.
You don't actually need anything that high for short runs.

Try it.

On Sat, Mar 3, 2018 at 8:35 AM, <epvgk at limpoc.com> wrote:

> I use a generic ebay one like this:
> https://www.ebay.com/sch/i.html?_nkw=112632873298
>
> Mine will adjust considerably higher than 120vdc, and puts out enough
> current to run a
> couple of loops and the M19 tape punch at the same time.
>
>
> On Sat, Mar 03, 2018 at 01:51:39AM -0700, Jordan Spencer Cunningham wrote:
> > 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
>
> > ______________________________________________________________
> > GreenKeys mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:GreenKeys at mailman.qth.net
> >
> > 2002-to-present greenkeys archive: http://mailman.qth.net/
> pipermail/greenkeys/
> > 1998-to-2001 greenkeys archive: http://mailman.qth.net/
> archive/greenkeys/greenkeys.html
> > Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
> http://comcents.com/tty/greenkeyssearch.html
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> 2002-to-present greenkeys archive: http://mailman.qth.net/
> pipermail/greenkeys/
> 1998-to-2001 greenkeys archive: http://mailman.qth.net/
> archive/greenkeys/greenkeys.html
> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
> http://comcents.com/tty/greenkeyssearch.html
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20180303/28acbf0d/attachment.html>