[GreenKeys] Trepac 538-A Telegraph Relay For Sale

[Nick England]

FWIW, Here’s the 60ma selector magnet driver used for military low level
+/-6v signaling.
http://www.navy-radio.com/manuals/tty/wd/323810WD-SMD.pdf

It has two ORed inputs, one of which can be tied to the keyboard in a KSR.

On Sun, Jul 19, 2020 at 10:34 AM Jim Haynes <jhhaynes at earthlink.net> wrote:

>
> The sad part of this is that I failed to sell what I still consider a
> better concept.  That was to have every selector magnet equipped with
> a transistor driver, and every transmitting contact equipped with a low
> voltage circuit, and run the whole set internally on low voltage along
> the lines of RS-232 polar signals.  (RS-232 didn't come along until
> several years later, and for a different purpose)
>
-- 
Nick England K4NYW
www.navy-radio.com
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