M
mynick
Guest
can you connect 12v output of at/atx supply to 5v output of the same
or another at/atx or there are gnd problems?
thank you
or another at/atx or there are gnd problems?
thank you
R
Rich Webb
Guest
On Sat, 18 Dec 2010 11:21:42 -0800 (PST), mynick <anglomont@yahoo.com>
wrote:
more quietly at 7 V (12 -> 5) vice full speed (12 -> GND). If this is so
then you're probably okay, with the caveat that you'll be introducing
switching noise from the fan motor onto the 5V rail and additional
filtering may be required/desired.
However, given the multitude of different power supply layouts and
mainboard layouts, it's also possible that doing this will let the magic
smoke out of something. There are too many variables to say for sure
that doing this in your particular case is safe.
You'll also probably lose the RPM indication from the third wire, if
you're using it. The ones I've seen are just open collector switches
between ground and open/pull-up and the hack moves "ground" to 5V.
--
Rich Webb Norfolk, VA
wrote:
I'm guessing that you're doing the "fan speed hack" to run the case fans
more quietly at 7 V (12 -> 5) vice full speed (12 -> GND). If this is so
then you're probably okay, with the caveat that you'll be introducing
switching noise from the fan motor onto the 5V rail and additional
filtering may be required/desired.
However, given the multitude of different power supply layouts and
mainboard layouts, it's also possible that doing this will let the magic
smoke out of something. There are too many variables to say for sure
that doing this in your particular case is safe.
You'll also probably lose the RPM indication from the third wire, if
you're using it. The ones I've seen are just open collector switches
between ground and open/pull-up and the hack moves "ground" to 5V.
--
Rich Webb Norfolk, VA
M
Michael A. Terrell
Guest
mynick wrote:
The grounds are bonded to the case and connected to the safety
ground, so you will short out the supplies.
--
For the last time: I am not a mad scientist, I'm just a very ticked off
scientist!!!
The grounds are bonded to the case and connected to the safety
ground, so you will short out the supplies.
--
For the last time: I am not a mad scientist, I'm just a very ticked off
scientist!!!
J
Jasen Betts
Guest
On 2010-12-18, mynick <anglomont@yahoo.com> wrote:
power input connector, and the nmetal case.
connecting 12V directly to 5V or to 5V in another PSU will do noting
good, the best you can expect is the machine to shut down, but it
could cause permanent damage.
--
ââ 100% natural
ATX PSUs connect the 0V (black) wires to the ground pin of the IEC
power input connector, and the nmetal case.
connecting 12V directly to 5V or to 5V in another PSU will do noting
good, the best you can expect is the machine to shut down, but it
could cause permanent damage.
--
ââ 100% natural
M
mynick
Guest
On Dec 19, 8:50Â am, Jasen Betts <ja...@xnet.co.nz> wrote:
http://webcache.googleusercontent.com/search?q=cache
UBbNJu1iz8J:www.edaboard.com/thread118391.html+connect+%22atx+power+supplies+in+series%22&cd=1&hl=en&ct=clnk&client=firefox-a
black wire from ac input ground
http://webcache.googleusercontent.com/search?q=cache
UBbNJu1iz8J:www.edaboard.com/thread118391.html+connect+%22atx+power+supplies+in+series%22&cd=1&hl=en&ct=clnk&client=firefox-a
J
John Fields
Guest
On Mon, 20 Dec 2010 11:46:35 -0800 (PST), mynick <anglomont@yahoo.com>
wrote:
Because the grounds are all connected together on the PCB, so you
can't connect them in series.
---
JF
wrote:
---
Because the grounds are all connected together on the PCB, so you
can't connect them in series.
---
JF
M
mynick
Guest
On Dec 20, 8:24Â pm, mynick <anglom...@yahoo.com> wrote:
http://www.acopian.com/acopianPowerSupplies/entry.aspx?nsId=17&name=Connecting-Power-Supplies-in-SeriesOn Dec 19, 8:50Â am, Jasen Betts <ja...@xnet.co.nz> wrote:> On 2010-12-18, mynick <anglom...@yahoo.com> wrote:
can you connect 12v output of at/atx supply to 5v output of the same
or another at/atx or there are gnd problems?
thank you
ATX PSUs connect the 0V (black) wires to the ground pin of the IEC
power input connector, and the nmetal case.
connecting 12V directly to 5V or to 5V in another PSU will do noting
good, the best you can expect is the machine to shut down, but it
could cause permanent damage.
--
ââ 100% natural
Why can't you unscrew the circuit board off the case-ie disconnect the
black wire from ac input groundhttp://webcache.googleusercontent.com/search?q=cache
non pc ps?
R
Rich Grise
Guest
mynick wrote:
series is a Very Bad Idea, because they'll fight over who gets to regulate
the output.
Don't even bother. Spring for the 24V supply.
Sorry.
Rich
No. Even if you floated one of the supplies, putting switcher outputs in
series is a Very Bad Idea, because they'll fight over who gets to regulate
the output.
Don't even bother. Spring for the 24V supply.
Sorry.
Rich
M
Michael A. Terrell
Guest
mynick wrote:
Then it will not work properly. Also, if you try to isolate it, it
will radiate a lot of RF and interfere with other equipment. it will
violate the UL or similar certification, and can kill you.
--
For the last time: I am not a mad scientist, I'm just a very ticked off
scientist!!!
Then it will not work properly. Also, if you try to isolate it, it
will radiate a lot of RF and interfere with other equipment. it will
violate the UL or similar certification, and can kill you.
--
For the last time: I am not a mad scientist, I'm just a very ticked off
scientist!!!
M
mynick
Guest
On Dec 20, 11:17 pm, Rich Grise <ri...@example.net.invalid> wrote:
I think each of ps will set their current to Vout.total/Load and
regulate it's output?
well if you unscrew the board /circuit gnd off the case ?
I think each of ps will set their current to Vout.total/Load and
regulate it's output?
J
Jasen Betts
Guest
On 2010-12-21, mynick <anglomont@yahoo.com> wrote:
the problem is that to make it work you'd have to effectively cut the
earth wire, the earth wire is a safety device and disabling it
increases the risk to anyone who encounters the equipment
--
ââ 100% natural
In theory connecting voltage regulated supplies in series is fine.
the problem is that to make it work you'd have to effectively cut the
earth wire, the earth wire is a safety device and disabling it
increases the risk to anyone who encounters the equipment
--
ââ 100% natural
R
Rich Grise
Guest
Jasen Betts wrote:
I'd be surprised if the series supplies don't break into uncontrolled
oscillations as they go in and out of overload and stuff.
Why not get the 2-prong adapter, lash it up on the bench, and report back?
(while doing this, of course the floated supply's chassis has to be
insulated from _everything_.)
Good Luck!
Rich
a pigtail, and a 3-prong plug); float the whole supply, and do a lashup -
I'd be surprised if the series supplies don't break into uncontrolled
oscillations as they go in and out of overload and stuff.
Why not get the 2-prong adapter, lash it up on the bench, and report back?
(while doing this, of course the floated supply's chassis has to be
insulated from _everything_.)
Good Luck!
Rich
M
mynick
Guest
On Dec 22, 12:02 pm, Rich Grise <ri...@example.net.invalid> wrote:
you have a proper error signal feeding the 2 small signal transfer
functions
The question is actually if say both 12v and 5 v are regulated do
you have a proper error signal feeding the 2 small signal transfer
functions
J
John Fields
Guest
On Wed, 22 Dec 2010 14:25:23 -0800 (PST), mynick <anglomont@yahoo.com>
wrote:
---
JF
wrote:
What, exactly, are you trying to do?
---
JF
H
Hammy
Guest
mynick <anglomont@yahoo.com> wrote in
news:b564355f-1f12-4abf-b191-92b7c3b92e75@y3g2000vbm.googlegroups.com
:
adjustable from 42-54V 3.3A MAX OUTPUT. Universal input TDK Supply.
Canadian distrubitor. $37
http://canada.newark.com/tdk-lambda/ls15048/power-supply-ac-dc-
48v/dp/08N2999
You could probably find one cheaper but you could trust this one more
then say one off EBAY.
news:b564355f-1f12-4abf-b191-92b7c3b92e75@y3g2000vbm.googlegroups.com
:
If your looking for a 120W 50 to 60V o/p PSU just buy one heres one--
ââ 100% natural
Why can't you unscrew the circuit board off the case-ie disconnect
the black wire from ac input ground
http://webcache.googleusercontent.com/search?q=cache
ww.edaboard.com/thread118391.html+connect+%22atx+power+supplies+in+
series%22&cd=1&hl=en&ct=clnk&client=firefox-a
adjustable from 42-54V 3.3A MAX OUTPUT. Universal input TDK Supply.
Canadian distrubitor. $37
http://canada.newark.com/tdk-lambda/ls15048/power-supply-ac-dc-
48v/dp/08N2999
You could probably find one cheaper but you could trust this one more
then say one off EBAY.
M
Michael Robinson
Guest
"mynick" <anglomont@yahoo.com> wrote in message
news:f5b98f98-dd75-4102-81f6-13330f451a5f@f20g2000vbc.googlegroups.com...
dismounted each power supply's circuit board and insulated it from the case.
I used the same insulating washers I mount TO-220 parts on heatsinks with.
The power supplies can touch each other without shorting out, and I didn't
have to change the plugs.
On the few occasions I've actually used these power supplies in series, they
have behaved well; no oscillations or faults.
Call it a redneck power supply.
news:f5b98f98-dd75-4102-81f6-13330f451a5f@f20g2000vbc.googlegroups.com...
I salvaged a couple of computer power supplies and seriesed them. I
dismounted each power supply's circuit board and insulated it from the case.
I used the same insulating washers I mount TO-220 parts on heatsinks with.
The power supplies can touch each other without shorting out, and I didn't
have to change the plugs.
On the few occasions I've actually used these power supplies in series, they
have behaved well; no oscillations or faults.
Call it a redneck power supply.
M
mynick
Guest
On Dec 26, 6:46 pm, "Michael Robinson" <nos...@billburg.com> wrote:
I suppose there will not be any probs because it has kia494
votage mode pwm inside
thanks
I suppose there will not be any probs because it has kia494
votage mode pwm inside
M
mynick
Guest
On Dec 28, 10:21 pm, mynick <anglom...@yahoo.com> wrote:
(joint) current regulation in addition to voltages
for sake of argument would 2 ps fight each other if there was pwm
(joint) current regulation in addition to voltages