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#1
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Antrim Transformers
I don't know if this will be of interest to anyone, but for some time, its annoyed me that its hard to find 230:230v isolation transformers. I knew of Antrim, but they had a minimum order of 10 transformers.
Well, it seems that they have removed that restriction and I have a nice 230:220 300va torroid on the desk next to me now :-) http://www.antrimtransformers.com/ Now to find out if voltage doublers do have any sonic cost. Oh dear, I just realised, it would make a ideal source of B+ for a 6c33c amp :-).
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Just about everything I say has been in public use since the 1940's so no one owns the copyright on that. If by any chance its not prior art, then the copyright is retained by me. |
#2
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Re: Antrim Transformers
Hi Nick
I see they also do Mains toroidals http://www.antrimtransformers.com/catalogue.php?sec=632 and Output p-p toroidals http://www.antrimtransformers.com/catalogue.php?sec=634 with reassuring specs of "Full output rating at 20Hz" all as single units. Not cheap but I'd like to hear some. On the voltage doubler thing, the drawbacks would be needing to double up on current rating for the TX and smoothing for the dc I think? |
#3
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Re: Antrim Transformers
Quote:
Of course the other disadvantage of the doubler is the lower regulation, but again, thats offset in this case by the use of the regulator in the supply.
__________________
Just about everything I say has been in public use since the 1940's so no one owns the copyright on that. If by any chance its not prior art, then the copyright is retained by me. |
#4
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Re: Antrim Transformers
Hi Nick,
Will there be "extra switching noise produced by the bigger current through the diodes"? I'm really not sure if this would be a "linear" problem - perhaps the diodes only hold just so much charge and hence will produce a fixed amount of noise, similar to the way they ramp up to a constant forward voltage drop after an initial draw. You could use schottkies... or bypass caps... |
#5
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Re: Antrim Transformers
And they do the klpp1 mains transformer, in case anyone is interested. (although it is not advertised on their list)
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#6
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Re: Antrim Transformers
Well, the plan seems to have worked, one 230:220 tx, into voltage doubler, one 10H choke two dual regulators (6080, ecl82, 0d3) and I have a dual variable voltage source, 350v - 550v 100ma a chan, could be more, but its only a 200ma choke. No sign of nasty switching artifects, hum and noise on the line at 420v is about 500uv P/P
__________________
Just about everything I say has been in public use since the 1940's so no one owns the copyright on that. If by any chance its not prior art, then the copyright is retained by me. |