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Sci.Electronics.Design is a worldwide Usenet news group that is used to discuss various aspects of Electronic Circuit Design.
We found 179 threads matching "psu"
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The most relevant threads are listed first
9v UNregulated PSU
phaedrus - 2010-01-15 17:50:00
Hi, chums,
It's good for you for me to be back!
Anyone know of a really simple 9v limited PSU schematic with no
regulation and no filtering or owt.?
...
Question about AT91SAM7A3 and JTAG
gm - 2010-04-27 15:06:00
Hi
I have soldered an AT91SAM7A3 on an TQFP100 adaptor in order to use it
with a breadboard. I have connected the following:
All the VDD3V3 to the PSU 3.3V
All the GND to the PSU GND
All the JTAG pins to the pins of my ULINK compatible programmer with
pull-ups for the TRST, TDI, TMS, TCK and...WANTED, THE UNIVERSAL INPUT PSU
2009-11-12 14:08:00
Looking for 110-265V 50/60/400 HZ and 12-28V DC INPUT 48V output psu
for a military application. I doubt it exists, load is 3 amps.
Steve
...Power Conversion Electronics
pg - 2009-04-26 05:20:00
I just purchase a Silverstone Power Supply Unit (PSU) for my PC.
I am amaze with the PFC (Power Factor Correction) rating of over 0.96,
which, according to some indicators, means it's 96% efficient. (4%
wastage as heat).
Since it's a new unit I dare not to open up the PSU to see what type
o...PSU for precision audio opamps
Dirk Bruere at NeoPax - 2008-06-13 11:24:00
I need +/- 12V from a 5V or 12V supply (PC PSU) to drive precision
audio stuff (LM4562).
Thinking of using a DC-DC converter eg XP Power or C&D.
The regulation on these isn't brillant at around 10%, but that
shouldn't be a problem.
Ripple is typically 0.5%
Any advice?
Dirk
...Re: High Energy Testing
Franc Zabkar - 2008-12-23 19:04:00
On Tue, 23 Dec 2008 21:43:11 GMT, "David L. Jones"
put finger to keyboard and composed:
> A frind of mine recently had fun testing a custom high energy PSU, too cool
> not to pass on:
>
> "This photo was taken during routine testing of my 400 joule discharge PSU.
>
> The PSU dumps 4,5...Question For The Gurus - Fan Noise (whine)
Tim - 2009-03-07 14:44:00
OK, I have a computer PSU powering a 100w amp. The system works great,
but if I connect the cooling fans (2 x 12v DC brushless), I get a loud
whine in both channels.
What is the best solution to reduce or eliminate the whining? I am
limited
for space, but could easily add caps or coils t...Earthed PSU question
2010-03-11 15:24:00
I`ve been struggling with this for quite some time and hope someone
may be able to point out the pros and cons:
Imaging a situation where I`m designing a new product and I need to
select an external AC=E0DC switch mode PSU with a very standard barrel
connection output. The product is a metal c...Re: TO220--thin leads--high current--How?
Michael Karas - 2010-05-02 11:00:00
In article ,
jjlarkin@highNOTlandTHIStechnologyPART.com says...
>
>
> Continuous 80 amps into a TO220 is insane.
>
> John
Real world experience here. I once did a design of a motor driver with
T0220 parts mounted vertical from a heat sink right down into a plated
through hole...Help with placement of filter inductor
pawihte - 2009-11-05 06:17:00
I want to modify an ATX PSU for use with a project and am
thinking of using a classic full-wave voltage doubler to get
about -20V from the center-tapped 5V winding (I'll be using a PSU
with separate 5V and 12V windings and the 12V winding will be
used for another section of the project).
...Re: Multipath WLAN problem?
2009-02-28 22:57:00
If its not the PSU caps, find some Echosorb sheets.
Steve Roberts
...Re: Laptop power supply
rebel - 2008-12-27 20:00:00
On Fri, 26 Dec 2008 19:42:04 -0500, "Michael A. Terrell"
wrote:
>
>
> >
> > I am trying to get the connector end for a D-600 90W power supply. The
> > wires are busted and its molded on. Ant suggestions? By the way, there
> > are two circuits plus a ground return in these connecto...PSU help understanding this circuit
TTman - 2010-05-15 07:21:00
Posting again as it appears not to have got through with a jpg attachment...
I need some help with this . I understand how some of it works, but not all.
Q1e is clamped by the 2v5 Vref.This provides a constant current for the 12V
zener of ~ 2.5/780 = 3mA. The zener clamps Q2b @ 12v and thus Q2e @...Noise on power supply net
Charlie E. - 2010-05-28 18:03:00
Hi All,
Ok, more on the dreaded color reader problems... ;-)
Now that I have the scope, been troubleshooting this thing a bit. One
thing I am seeing is that there is a lot of noise on my power net.
While the chip's specs say it should have a ripple of around 40mVs, I
am also seeing a noise s...Re: An IC that can switch a 120V power source?
Nobody - 2009-03-16 18:40:00
On Mon, 16 Mar 2009 14:30:17 -0700, Timur Tabi wrote:
> I'm looking to create a simple circuit that uses standard 5V ICs, one
> of which I can use to control a standard 120V/60Hz AC power line. I
> know these kinds of voltages are dangerous, so I would like something
> that includes some ...Re: SMPS and EMI
2010-06-10 04:00:00
On Wed, 9 Jun 2010 05:27:37 -0700 (PDT), Michael
said:
> Our new product just failed EMI compliance test. Thanks to (no name)
> off-the-shelf power brick we are using.
> It generates plenty of noise way over 100MHz.
> It makes me wonder... 100MHz means ... what?... 3-5ns switching
> t...Re: Current limiting with an visual indicator of overload
Baron - 2009-06-09 17:48:00
OBones wrote:
> Hello,
>
> I'm currently planning the conversion of an AT computer power supply
> that I have lying around into a base supply for my hobbyist
> electronics projects .
> I know that there is a reason a lab supply costs that much, but for
> the use I'm planning, a comp...Re: Mains, LEDs and Law
Raveninghorde - 2009-01-20 10:57:00
On Tue, 20 Jan 2009 09:31:31 +0000, Raveninghorde
wrote:
> On Tue, 20 Jan 2009 00:14:12 +0000, Dirk Bruere at NeoPax
> wrote:
> > What do commercial mains LED lights use? This kind of simple circuit or
> > neat stepdown xformers and constant current PSUs?
>
> In my case a 120W PF ...Re: Switching power supplies and overcurrent protection
oparr@hotmail.com - 2009-12-05 02:38:00
> You already know what kind of PSU works .
I think it suffices to say that the mean spirited and the wretched
from down under are best avoided.
On Dec 4, 10:44=A0pm, "Phil Allison" wrote:
>
...Negative voltage from Transformerless Capacitive power supply
Centron System Solutions - 2009-06-22 05:41:00
Hello All
I am designing a circuit for a very low cost consumer product. We are
at prototype stage.
AN954 from microchip is a good reference for this design.
http://ww1.microchip.com/downloads/en/AppNotes/00954A.pdf
Circuit for capacitive PSU on page 2.
The power supply is Transformerl...Re: Are these voltages good or bad ?
larry moe 'n curly - 2008-08-02 11:08:00
Skybuck Flying wrote:
> Why 99% of Power Supply Reviews Are Wrong:
>
> http://www.hardwaresecrets.com/article/410/3
If a PSU review doesn't include amp measurements, then it can't be
trusted.
...Bipolar transistors in reverse
E - 2010-02-21 04:16:00
Got just two nice lab psu (100W and weight only 13 kg) off Ebay.
So to put them in some use I measured how well some bipolars work
with collector and emitter swapped.
http://koti.mbnet.fi/hsahko/trans/
-ek
...Re: OrCad/ question
Klaus Kragelund - 2010-05-18 19:41:00
On 19 Maj, 00:37, Vladimir Vassilevsky wrote:
> Jim Thompson wrote:
> > On Tue, 18 May 2010 20:37:28 GMT, n...@puntnl.niks (Nico Coesel)
> > wrote:
>
> > > EE123 wrote:
>
> > > > I am running a magnetic transformer simulation.
> > > > However, I get an error involving converg...Re: Transformers - Frequency of AC?
Eeyore - 2008-04-16 08:48:00
Phil Allison wrote:
>
> >
> > Is it possible to use a transformer with a 50KHz chopped DC source?
>
> ** Not unless the resulting chopped wave has no DC component to it.
How do you think a flyback PSU works ?
Graham
...Re: tactile switch
TheM - 2008-01-12 14:53:00
"Jan Panteltje" wrote in message news:fmaj3f$psu$1@aioe.org...
> Dont they offer a pdf for download?
> I sometimes download their pdf and it tells you who makes it too.
Don't think so, not in this case.
M
...Re: Skybuck's Dream PC, Third Build, Done 99.9% ;) (Pictures!)
FatBytestard - 2008-08-01 20:17:00
On Fri, 1 Aug 2008 17:08:09 -0400, "cside"
wrote:
> However, the power supply fan also seems to
> > be blowing inward, which isn't going to work.
I doubt seriously that the PS fan blows into the case. I believe that
violates the ATX PSU spec.
...Re: Led lights and voltage
Eeyore - 2007-12-26 23:34:00
madamchryzl@gmail.com wrote:
> If I connect 8 leds @ 1.6v vf onto a power supply producing 12vdc, I
> won't have to use a resistor, right? Theory being that the 8 led's
> will use .8 volts more than the ps can provide.
According to your 'theory' that means they won't illuminate at all...Solvent smells in new gear
Sylvia Else - 2009-04-26 00:54:00
I've never noticed this as a problem in years gone by, but of late I've
bought a number of items which produce a strong solvent smell when
turned on, with varying amounts of time before the smell wears off.
One was a PC PSU, which I sent back because the smell was so
overpowering, even afte...LCD backlights for general lighting
Dirk Bruere at NeoPax - 2008-07-25 09:23:00
Any idea how much just the backlight plus PSU on (say) a 22" LCD costs?
And what it's output is?
--
Dirk
http://www.transcendence.me.uk/ - Transcendence UK
http://www.theconsensus.org/ - A UK political party
http://www.onetribe.me.uk/wordpress/?cat=5 - Our podcasts on weird stuff
...Schematic or service manual for SOLA 325 UPS
Sylvia Else - 2009-04-24 01:14:00
My longserving SOLA 325 UPS suddenly quit yesterday. Other than a relay
that switches when power is supplied, it appears completely dead.
Anyone have a sevice manual, or schematic, for this model?
Or ideas? Normally, my first thought would be that its PSU had failed,
but it has batteries a...Re: LTSpice Automation
Joel Koltner - 2010-02-22 13:14:00
Hi Tim,
"Tim Wescott" wrote in message
news:l_WdnQL_L-JIVR_WnZ2dnUVZ_vti4p2d@web-ster.com...
> Actually in Oregon it varies by county.
Ah, OK, that was for Kerr library at Oregon State in Corvallis.
Interlibrary loan was important to me in that, while OSU had most of the good
engin...Re: Toroid for mains conversion?
Phil Allison - 2009-07-03 02:39:00
"John Larkin"
"Bob.Jones5400@gmail.com"
>
> > > I saw a site once that said toroids were much more efficient and much
> > > smaller in height then equivalent E-I type transformers. Why do we not
> > > see very many for mains conversion if this is the case?
> >
> Switchers.
** Asid...Re: in-circuit spectral noise characterization?
Eeyore - 2008-10-21 05:32:00
BW wrote:
> Hello!
>
> When designing ultra low-noise PSU's and related circuits, what do you
> use to characterize them with regards to noise ?
With audio equipment I measure the audio band noise. Often anywhere
between 50 and 300uV depending on loading with good PCB layout and co...Re: ucontrollers (AVR/ATMega) and radio transceiver modules
Tim Watts - 2010-01-27 07:22:00
Charlie E.
wibbled on Wednesday 27 January 2010 02:23
> Tim,
> When you say power, are you talking 24VAC for powering the thermostat,
> or full 120VAC. If the latter, it is a big code no-no to put ANYTHING
> low voltage in there!
240V mate, in Blighty here...
I know (unless...Trying to source a connector.
2009-01-23 13:01:00
Anybody have any idea what the red and black jacks are on the back of
one of these?
It used to be a industry standard, but I cant find out what it is
called.
sockets on the back of the "phase modulated power supply"
here: http://www.uslasercorp.com/catalog/electronics.html
I'm sw...Re: Custom transformer
Eeyore - 2008-12-22 06:17:00
David Bourgeois wrote:
> And as you suggested, I'll probably end up replacing all caps in the scope.
It's the simplest and most reliable answer in the long run, although PSU caps
tend to be the worst culprits.
Also look for any can bulging or leak of electrolyte around the base. Sure
...Re: home brew S-100 backplane project
Bob Larter - 2009-06-03 03:25:00
lynchaj wrote:
> As you know, S-100 has some rather unusual power requirements and its
> difficult to come up with replacements.
Not that unusual. The biggest hassle these days would be the 8V rail.
> You can make you own linear
> power supplies but they are usually huge and difficult ...Re: Computer started putting out EMI
pimpom - 2010-03-04 10:10:00
amdx wrote:
> This morning my portable AM radio had interference on it.
> I walked around the house looking for the source and it
> turns out to be my computer. I have had this computer for
> about three years, I listen to AM daily and this EMI just
> started.
> The interference was pr...battery charger topology
reggie - 2008-01-29 09:29:00
Hi all,
My battery charging knowledge is limited, but I know a bit about SMPSU
design.
I was wondering what topologies and silicon could be used to deliver
substantial powers used to charge a 300Ah 24V lead acid battery bank
(employing three stage charge curve like :-
http://www.electroparts...Re: UPS: "Do not connect laser printer..."
Nobody - 2009-07-19 19:56:00
On Sun, 19 Jul 2009 14:19:10 -0400, Michael Robinson wrote:
> > The main heater (the one that fuses the toner so it sticks to the
> > paper) is usually run on a thermostat, using a big SCR (triac, to
> > be more specific). Those SCRs can trigger on fast-rising spikes
> > on the power ...