[GreenKeys] Loop Supply

[John, W9DDD]

Well to add to the confusion perhaps, I just found wiring diagram from 
1964 which shows magnets on some printers as being 105 ohms and wiring 
in series.  Others with the option for series or parallel connection and 
those were shown to be 90 ohm coils.

The diagrams were keyed to model numbers like 15A or 15J.
http://www.navy-radio.com/manuals/tty/572-202-400-6412.pdf

John, W9DDD

On 12/14/2018 5:00 PM, Ralph Mowery wrote:
> Series  connection for the holding magnets is wrong.
> 
> The reason being is you want as little inductance in the loop as 
> possible due to the rise time of the current, so that is a parallel 
> connection.
> 
>    I am sure the holding magnets are parallel for 60 ma loops.  I think 
> that the larger pulling magnets were only used in a series connection 
> for 60 ma and never paralleled for any normal loop.
> 
> *From:*David Deatrick [mailto:phialpha127 at gmail.com]
> *Sent:* Friday, December 14, 2018 5:09 PM
> *To:* Ralph Mowery
> *Subject:* Re: [GreenKeys] Loop Supply
> 
> I can’t remember exactly when I had my model 15 and later the 19 but I 
> think series for selector magnets were preferred. Here is a oldie but 
> goodie from my 1967 for your enjoyment
> 
> 
> 
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