[ARC5] Vibrator Power Supplies

[GDM]

I seem to remember that back in the 1960's weconverted 6 volt DC car 
radios to AC, by feeding 6 volts AC from a filament xformer into the 6 
volt primary winding on the vibrator xformer (after removing the 
vibrator). I know it worked,  because I had such a lash up in my garage 
for years.  Can't remember the exact details, but I believe we had to 
remove the 1600 volt cap.     The vibrator xformer ran hot, but not so 
much you couldn't touch it.

de  W9OAK


On 12/7/2012 10:32 AM, Sandy wrote:
> As I properly remember the vibrators usually worked at a frequency of 
> around 115 cps.  60 cycles is too low!  The same thing happens when 
> you attempt to use the old aircraft type transformers which operated 
> at 400 cps on a lower frequency. There isn't enough iron to make the 
> transformer operate properly on 60 cps.  Way back in the post war  
> (WW2) Panama Canal Zone (where I lived for a few years as a child) the 
> power was 115 volts at 25 cycles.  The transformers for all the gear 
> like Johnson Viking 1 (which was then very popular!) worked from 50-60 
> cycles but not on 25 cycles!   Hams were "loaned" a transformer which 
> was used outboard of the equipment that supplied the same required 
> voltages for the Viking 1 but with a 25 cycle (Hz) operating frequency.
>
> I suspect the trouble you are having with the old RCA Carfone stuff 
> doesn't want to supply the rated voltages at 60 Hz instead of 115 Hz  
> (which I recall is the frequency the vibrators operated at.)
>
> 73,
>
> Sandy W5TVW
>
> -----Original Message----- From: Robert Eleazer
> Sent: Friday, December 07, 2012 7:35 AM
> To: arc5 at mailman.qth.net
> Subject: [ARC5] Vibrator Power Supplies
>
> Two questions:
>
> 1.  Why did they not use vibrator power supplies instead of dynamotors 
> in WWII?  They ought to be cheaper and easier to build.
>
> 2.  I have the transformers out of an old RCA Carfone vibrator power 
> supply. Tried to make a DC power supply out of them.  They do not work 
> all that well with 115V 60Hz on the secondary.  Anyone know why?
>
> Wayne
>
>
>
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