[GreenKeys] Current limiting

[Jeffrey D Angus]

Michael O'Day wrote:
> Does that mean the 15 requires a higher voltage that
> the 33? I recently aquired a 15, do I need to build a
> HV (120+) supply for it, or can I run it on one of
> those Black Box RS232/Current Loop adaptors?
The Black Box doesn't seem to like to be used in the passive mode
(i.e. external power supply) at 120 VDC. The output device seems
to self conduct and stay in the "on" mode.

Nor does the Black Box have enough "oomph" to drive the selector
magnet properly when used in the "active" mode.

Good thing I bought three of them, I think I've killed the first two
trying to get them to work properly with the Lorenz LO 15 C.
(A clone of the Teletype Corp Model 15.)

My next strategy is to go through the subscriber box of the Lorenz
(which has a polar relay) and see if I can key that line properly and
not kill my remaining Black Box.

Jeff-1.0
wa6fwi