[GreenKeys] Run teletype model 15/19 keyboard and printer on different circuits?

[hwhall@aol.com]

It seems like a fair question to ask, "Why would you want to do that?"

Wayne
WB4OGM

On Tuesday, September 16, 2025 at 07:43:19 PM MDT, Windows XD <antech6586856 at gmail.com> wrote: 

Dear all,

I was working on the teletype when I had an idea. I have already picked up a solid state relay capable of switching faster than the 45.45 baud needed for the teletype for something else I'm working on with the teletype, and I was wondering if it would be possible to run the keyboard on a 5vdc circuit wired to said solid state relay and have the keyboard run on 5vdc and the selector magnets at 120vdc. I can't think of any obvious problems with running the keyboard at this lower voltage, but I'd like to be sure.

I'm not sure I explained it super great so I've attached a schematic, although I'm not sure if it's any better than my explanation.

P.S. My keyboard has arcing problems with the contacts, will this modification coincidentally also fix that?

______________________________________________________________
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 hwhall at compuserve.com