50Vdc - 300Vdc to 15Vdc

In article , wrote: [....]

Why don't you just go buy a 15V power supply that plugs in the wall? It is likely to be the least costly option.

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kensmith@rahul.net   forging knowledge

vasile ha escrito:

Hi, thanks for your answer and your nice explanation, so is this correct?

if is that correct my "problem" is resolved, i said problem with quotation marks, because my problem was just with the meaning of ground, and another thing i suppose that no but i preffer to ask, when the 300v power supply varies, are there problems with the 15V?

For the transformer specification(1000v dielectric isolation) do i need a special transformer or just the typical transformer has that characteristic?, with typical i mean the transformer that you buy when you go to the shop and you say a 220v-25v transformer. I said the 7815 just reffering to a linear regulator, if i need 1Amp, i will put the heatsink. Thanks again for your answer.

Ken Smith ha escrito:

Thanks for your answer. My problem is not getting the 15V, the problem is if the 15v that i get with a power supply are also 15V reference to the ground of the 300V power supply.

jasen ha escrito:

Hi, thanks for your answer, finally i will use the transformer is easier, i will reffer the 15V ground to the 300V ground and that's all, my problem was, that i wasn't very sure if i could do that, and yes, the dc dc converter is more fun, and that's because i initially post here asking about a dc dc converter, and finally thanks for your answer.

vasile ha escrito:

Hi, thanks for your answer and your nice explanation, so is this correct?

, if is that correct my "problem" is resolved, i said problem with quotation marks, because my problem was just with the meaning of ground, and another thing i suppose that the answer is no but i preffer to ask, when the 300v power supply varies, are there problems with the 15V?

For the transformer specification(1000v dielectric isolation) do i need a special transformer or just the typical transformer has that characteristic?, with typical i mean the transformer that you buy when you go to the shop and you say a 220v-25v transformer. I said the 7815 just reffering to a linear regulator, if i need 1Amp, i will put the heatsink. Thanks again for your answer.

Ken Smith ha escrito:

Thanks for your answer. My problem is not getting the 15V, the problem is if the 15v that i get with a power supply are also 15V reference to the ground of the 300V power supply.

In message , dated Thu, 3 Aug 2006, snipped-for-privacy@gmail.com writes

Very definitely NOT. You have the 220 V mains connected via the rectifier to the 7815. You have left out the 220 V:15 V transformer!

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OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
2006 is YMMVI- Your mileage may vary immensely.

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

I would expect 1000V or more to be typical. You should check.

Bye. Jasen