[Shop-talk] old battery charger, how it works?

[BJNoSHOV8]

Is this a test?

I would think that normally you would have a diode to form a rectifier 
that would convert AC to a form of DC.  Well I don't think semiconductor 
diodes were around then and you didn't say anything about having vacuum 
tubes in there.  I was kind of wondering if you could take a sine wave 
output from one transformer and combine it with a sine wave output from 
another transformer that is 180 degrees out of phase, and the result 
would be a lumpy DC wave.  But I couldn't find any evidence that anybody 
ever did this, so maybe my reasoning is faulty.  But there were power 
conversion systems that used rotating elements and also systems that 
used vibrating points to switch between different phases.  (OK, I just 
figured out how my reasoning about combining sine waves was faulty, so 
can't do that.)



> I have a mid 30's battery charger and I cant understand how it works.
>
> It has 120Volt AC going in.
>
> Inside is a transformer with several different wires coming off the 
> windings, I assume these are for different voltages.
>
> It has a rotary switch, like the channel changer on your fathers TV. 
> different amperages?
>
> a couple of glass plug fuses in holders.
>
> and a light bulb that screws into a regular light bulb base. (GE 189048)
>
> How does it make DC?  or does it?
>
> Thanks
>
> Skip
>
>
> Nothing is as it appears
> Skip Albright
> Glenmont NY
> salbrigh at nycap.rr.com
> http://www.volvoskip.com/
> _______________________________________________
>
> Shop-talk at autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation  $12.96
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage: 
> http://autox.team.net/mailman/options/shop-talk/bjshov8@tx.rr.com
>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.900 / Virus Database: 271.1.1/3627 - Release Date: 05/09/11 13:35:00