[GreenKeys] Model 15/19 power supply 120VDC

[Johannes Eggers]

And is it supposed to run at 100 or at 120?


On Mon, Mar 2, 2026, 20:26 E. <hanyou at xsmail.com> wrote:

>
> 1A is needed for the punch… I’ve also measured it and it’s around there.
> Too little may stress the power supply.
>
>
> > On Mar 2, 2026, at 8:07 PM, Brenda Gentry via GreenKeys <
> greenkeys at mailman.qth.net> wrote:
> >
> > Another source of transformers is industrial control transformers. Many
> have two primaries for 120/240 volts in. If you find one that is 50 VA, the
> two primaries can be connected one to the line and the other to the load
> and used as an isolation transformer for a loop circuit.  A model 19 needs
> a  good bit of  current for the punch, a 250 VA transformer would be plenty
> for both the punch and the loop. Look around for them on the internet and
> at hamfests, used ones are often inexpensive.
> >      Brenda Gentry, KA2IVY
> > On 3/2/26 8:29 PM, Jeffrey Golas wrote:
> ______________________________________________________________
> 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
>
> >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
> https://teletype.net/gksearch
> >>> 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
> Message delivered to johannes.eggers at gmail.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20260302/2bd05b56/attachment.html>