workshop addition

[dsaint]

i just finished my exams at uni and now i am going to devote myself to
electronics. and my first project i think i'll start working on is an
isolated supply system by maily using two scavanged torrodial transformers
from 420v to 45 couple 1:2 2:1 to isolate the suply and then feed an elcb
and two mcb to isolate to power rails for my workshop what do you think?
and i want to ask a simple question but which i cant find a way two work
around this is if you can build a diy variac?

regards

*** Sent From/Enviado desde: http://groups.expo.st ***

 

[John Larkin]

On Wed, 15 Jun 2005 19:08:40 +0200, atlantis@keyworld.net (dsaint)
wrote:

i just finished my exams at uni and now i am going to devote myself to
electronics. and my first project i think i'll start working on is an
isolated supply system by maily using two scavanged torrodial transformers
from 420v to 45 couple 1:2 2:1 to isolate the suply and then feed an elcb
and two mcb to isolate to power rails for my workshop what do you think?
and i want to ask a simple question but which i cant find a way two work
around this is if you can build a diy variac?

regards

*** Sent From/Enviado desde: http://groups.expo.st ***

I've never seen that done in a lab workbench. If the issue is safety,
just use a ground fault detector.

John

 

[Joerg]

Got your degree? Congratulations!

Variacs can often be bought at surplus stores. I don't think it is
feasible to build one yourself. Also, keep in mind that many variacs do
not isolate, IOW they are not always an isolation transformer at the
same time.

Regards, Joerg

http://www.analogconsultants.com

 

[Paul Burke]

dsaint wrote:

i just finished my exams at uni and now i am going to devote myself to
electronics. and my first project i think i'll start working on is an
isolated supply system by maily using two scavanged torrodial
transformers from 420v to 45 couple 1:2 2:1 to isolate the suply and
then feed an elcb and two mcb to isolate to power rails for my workshop
what do you think? and i want to ask a simple question but which i cant
find a way two work around this is if you can build a diy variac?

I haven't got the isolating transformer, but my workbench was RCD
protected long before it became the norm in the mains panel. It saved me
from harm- twice in 25 years. That's useful enough for me, even though
it still hurt.

Paul Burke