[ARC5] 28 volt transformer question ?

[Tom Lee]

Very impressive, Mike -- I admire your dedication, as well as your luck 
with the Poly Paks diodes. ;) "U test 'em, and save!"

--Cheers,
Tom

-- 
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu

On 9/8/2020 14:37, MICHAEL ST ANGELO wrote:
> I needed a hefty 12 volt supply to power the Wireless 19 set acquired 
> from my uncle. I had a miniscule budget based on mowing lawns. I 
> removed a power transformer from a TV set. Fortunately the secondaries 
> were the outside winding so I carefully cut them out with a hack saw 
> and wound a new secondary with 12 gauge magnet wire and fed a bridge 
> rectifier built with 4 heavy duty Poly Paks diodes. I hooked up a huge 
> capacitor bank. It barely started the dynamotor and regulation was 
> poor so I used the supply to charge a car battery through a series 
> diode to run the dynamotor.
>
> The toughest part was winding the magnet wire around the core. I 
> calculated the number of turns needed and added extra and scraped the 
> insulation off to add taps for fine voltage adjustment.
>
> Mike N2NS
>
>
>> On 09/08/2020 4:09 PM Hubert Miller <kargo_cult at msn.com> wrote:
>>
>>
>> In the early 1960s I had a 'paper route' and one of my customers 
>> worked at the Army radio receiving station in the town, Lynnwood 
>> Washington.
>>
>> In his small house he had his ham radio setup, which he showed me. I 
>> think the receiver was a Super Pro. The transmitter was an ART-13. He 
>> told
>>
>> me about the 28 volt power it required and how many amps, and I asked 
>> how he got that, as high current low voltage supplies very uncommon in
>>
>> those times. He told me he had wound the transformer himself, and I 
>> was astonished. Who ever heard of someone winding their own power
>>
>> transformer?
>>
>> This was in the days of "party line telephones" in Lynnwood, and when 
>> his ART-13 was on the air, his conversation was one of the ones on 
>> the phone.
>>
>> -Hue Miller
>>
>
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