[GreenKeys] Loop Supply

[Xavier Andrieu]

My understanding was that selectors with "pulling magnets" can only be used
at 60 ma and selectors with "holding magnets" can be wired in series or in
parallel and then run either 60 ma or 20 ma. (see
www.baudot.net/gil/tty-machines/M15-KSR.htm).

 

Xavier

 

De : greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] De la part de John, W9DDD
Envoyé : vendredi 14 décembre 2018 21:34
À : greenkeys at mailman.qth.net
Objet : Re: [GreenKeys] Loop Supply

 

I'm foggy about the specifics of the 15 (about 57 years of cobwebs), but you
show in your drawing what appears to be magnets wired in series instead of
parallel, which would be normal for 60ma.  You can go 30ma with parallel
connection, normal was 20.  

John, W9DDD

On 12/14/2018 2:18 PM, Xavier Andrieu via GreenKeys wrote:

The capacitance of the output cap is 100 microfarad and there is a bridge
rectifier.

 

Xavier

 

De : greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] De la part de JC White
Envoyé : vendredi 14 décembre 2018 21:07
À : GreenKeys at mailman.qth.net
Objet : Re: [GreenKeys] Loop Supply

 

Just a quick question and suggestion:  What is the capacitance of the output
electrolytic cap in you 120 volt supply?  Since adding a cap gives you
greater range I would guess you are not getting the current and voltage you
think at the selector mags... obviously additional capacitance provides a
bit more oomph (very technical engineering term)...  your schematic shows no
details of how the 120 vdc is derived so ???

 

John

WB6BLV

 


 
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