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40 amp Power Supply ?

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rijo1
Guest

Wed Feb 02, 2005 3:01 am   



Hi techs , I want to build a 40 amp power supply to use for amateur
radio . I want to use a transformer out of a battery charger but I have
no schematics for the design. The input voltage will be 120 volts and I
need the output voltage to be 12 volts to 13.5 volts regulated .
Like I say I have no schematics for this project but would sure
appreciate any good help in design , weather it be tube type or
semi-conductor principle .
What should I go with , tubes or semi- conductor ?
Anyone with any good schematics that wants to help please send them
to me without viruses attached to my Email address and take "no" off
from nemonet.com .

DaveM
Guest

Wed Feb 02, 2005 5:36 am   



"rijo1" <rijo1_at_nonemonet.com> wrote in message
news:420044B0.CAF369C2_at_nonemonet.com...
Quote:
Hi techs , I want to build a 40 amp power supply to use for amateur
radio . I want to use a transformer out of a battery charger but I have
no schematics for the design. The input voltage will be 120 volts and I
need the output voltage to be 12 volts to 13.5 volts regulated .
Like I say I have no schematics for this project but would sure
appreciate any good help in design , weather it be tube type or
semi-conductor principle .
What should I go with , tubes or semi- conductor ?
Anyone with any good schematics that wants to help please send them
to me without viruses attached to my Email address and take "no" off
from nemonet.com .



40 amps is a pretty hefty power supply. That's pretty mush out of the
league for vacuum tubes... power semiconductors is the solution.
Here's a link to a project that will supply 30A regulated power... you
might start with that and add more power transistors later when you
determine that your transformer can supply the voltage and current needed to
maintain regulation.
http://www.mitedu.freeserve.co.uk/Circuits/Power/1230psu.htm. A link to a
smaller supply http://www.electronics-lab.com/projects/power/028/index.html.

You might read the material on regulated power supplies at
http://www.epanorama.net/links/psu_linear.html before you get too involved.
It will probably save you a ton of confusion and frustration later into the
project.

Regulated power supplies need significantly higher filtered DC voltage on
the regulator input than you may realize, so a battery charger transformer
may not be totally adequate at that high current demand. Be sure to read
about the calculations that you need to make prior to starting the project.
Some good info on that in the Theory section of the
http://www.epanorama.net/links/psu_linear.html page.

Good luck on your project. Be sure to come back here with questions as you
get further along.

--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)

Never take a laxative and a sleeping pill at the same time!!

rijo1
Guest

Wed Feb 02, 2005 5:41 am   



Thanks Dave , this is very helpful .

DaveM wrote:

Quote:
"rijo1" <rijo1_at_nonemonet.com> wrote in message
news:420044B0.CAF369C2_at_nonemonet.com...
Hi techs , I want to build a 40 amp power supply to use for amateur
radio . I want to use a transformer out of a battery charger but I have
no schematics for the design. The input voltage will be 120 volts and I
need the output voltage to be 12 volts to 13.5 volts regulated .
Like I say I have no schematics for this project but would sure
appreciate any good help in design , weather it be tube type or
semi-conductor principle .
What should I go with , tubes or semi- conductor ?
Anyone with any good schematics that wants to help please send them
to me without viruses attached to my Email address and take "no" off
from nemonet.com .

40 amps is a pretty hefty power supply. That's pretty mush out of the
league for vacuum tubes... power semiconductors is the solution.
Here's a link to a project that will supply 30A regulated power... you
might start with that and add more power transistors later when you
determine that your transformer can supply the voltage and current needed to
maintain regulation.
http://www.mitedu.freeserve.co.uk/Circuits/Power/1230psu.htm. A link to a
smaller supply http://www.electronics-lab.com/projects/power/028/index.html.

You might read the material on regulated power supplies at
http://www.epanorama.net/links/psu_linear.html before you get too involved.
It will probably save you a ton of confusion and frustration later into the
project.

Regulated power supplies need significantly higher filtered DC voltage on
the regulator input than you may realize, so a battery charger transformer
may not be totally adequate at that high current demand. Be sure to read
about the calculations that you need to make prior to starting the project.
Some good info on that in the Theory section of the
http://www.epanorama.net/links/psu_linear.html page.

Good luck on your project. Be sure to come back here with questions as you
get further along.

--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)

Never take a laxative and a sleeping pill at the same time!!


elektroda.net NewsGroups Forum Index - Electronics Others - 40 amp Power Supply ?

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