[GreenKeys] Constant current supply schematics

[Tim McNerney]

It would be great if we could share schematics like
this on the list, but alas, I gather that attachments 
are not allowed (which is probably a good limitation given 
all the "image spam" these days).  If you would like, I 
will volunteer to make any schematics you guys send me 
available for general viewing on my "retro microprocesor" 
web site

     http://www.4004.com

--Tim McNerney

wb6blv at inreach.com wrote:

For a long time I have experimented once in a while with
constant current loops for my TTY equipment.  Long ago Irv Hoff
gave a presentation at WA6YKY (Northrop Institute of
Technology, Inglewood, Ca) that included information of holding
the current constant in a loop as various combinations of
machines were patched in and out.  Back then we used a 6V6 with
a 1K wirewound in the cathode as a means of making the current
pretty much independent of the number of selector magnets in
the loop.  I have been using a solid state desing on and off
for several decades.  If you have any interest in a copy of the
schematic, including nominal component values for 20 and 60 mil
loops (GIF or JPG format), please contact me off-list.

73

John
WB6BLV at inreach.com



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