[GreenKeys] Current Loop Converter

[WA5CAB at cs.com]

Bill,

I'm not absolutely certain about 28 Series units, although I think they are 
all strappable for either current.  Most 14/15/19 sets only run 60 ma, as 
most machines were shipped with the large almost cylindrical pulling magnets 
and magnet assembly.  There is an optional holding magnet assembly that is 
switchable between 60 and 20 ma.  It isn't common.  I think I've only ever 
had two machines with it.  The magnets on it are smaller and almost square 
cross section.  

In a message dated 12/11/2009 10:22:43 AM Central Standard Time, 
ehorne at speakeasy.net writes: 
> By the way, I've just realized that I don't know what the "standard" 
> current loop value was: I'm used to 60ma from Model 15 machines, but I 
> don't remember what the Model 33 used, and I never worked on the Model 
> 28. I know the 33's had a built-in driver assembly that used transistors 
> to deliver ~500ma to the magnets, but I don't recall the default input 
> current value during "marking" conditions.
> 
> Was the current value a strapable option in the 15/28/whatever, or did 
> the 20ma machines have to have the special selector magnet assemblies 
> that reset the armature mechanically before each pulse?

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480