Jim Kearman wrote:
> From: Steve Thompson <g8gsq@eltac.co.uk>
>
>>I've also been
>>burned (both metaphorically and literally) by attractive looking big
>>transformers which turn out to have been designed for use with choke
>>input. Hook them onto a capacitor input PSU, and you get much less power
>>than you were expecting, lousy regulation, and the smell of burning
>>insulation.
>
>
> My friend obtained a 1000-VCT brute of a transformer, weighs 25 lb. Old
> Chicago Transformer, potted, looks mil-surplus. I assume it was made for a
> choke-input filter. He wants to use the full secondary with a full-wave
> voltage doubler. This will be for a linear that will be used for
> continuous-carrier DSB AM. Looks as though two chokes would be required?
> Thanks.
If you derate the transformer for output current, the chokes are not
necessary. You can also lower the peak factor on the windings by
adding a small inductance in series with the primary to spread out the
rectifier conduction time.
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