[ARC5] Vibrator Power Supplies

[J. Forster]

I have seen exactly that hack to a WS 19 power supply to run the receiver
only on 115 VAC.

Pretty marginal, IMO.

-John

============



> 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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