Router power supply: Switch mode or linear?

I need to replace a failed power supply for a router - which model doesn't really matter but the router is a WRT54GS (12V 1000mA). Which is best - a switch mode or a linear power supply? Will either be just as good? Please only answer if you DEFINITELY know the answer. Cheers, Mike

Power adapter uses External, 12V DC, and 0.5A...

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Slimline S5-1060 auto power supply switching

I just recently move to Australia from the US and brought my slimline s5-1060 with me. I think I can just plug it in to the Australian 240v system with a proper plug adapter or changing out the cord . The sticker for the power supply is below. Can you tell me if it is safe to plug in to the Australian power system. There is no little red switch from 110 to 220 like I have seen in the past on previous desktop computers. Thank you for your help.

Hi,
I can't read the label on the power supply. However, if it indicates 120/240 volts and 50-60 cycles then you should be OK as most of the new power supplies are auto sensing and no longer require a voltage switch.
You can further review the power supply specifications here.
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Power Supply Switch!

Okay, here's the scenario. i bought an Apple iMac a few years ago in the UK where their power supply is around 220v. Since then i have moved country where the voltage system has changed to 120v instead.
Currently i use a transformer to convert voltage system from 120v to 220v so that i can run my iMac. So i'm wondering if anyone might know if there might be a switch that i can flick to allow my iMac to run on the same 120v so that i don't have to use a heavy cumbersome transformer.
looking forward to any replies on this topic.
^Ch@mber^

Hello and Welcome to Apple Discussions.
As Stedman suggests all iMacs (with the exception of some US bought early iMac G5s) have dual power supplies and will work on 100-250volts or so.
mrtotes

Power Supply switching

Hi,
I am not sure whether this is the correct forum to post this question but I think it may be a problem which may be common and someone may be able to help.
I am currently using a TTi TSX3510P DC power supply to drive a simple electro-magnet. One end of the windings goes to the positive and one to the negative of the supply (obviously) which allows me to ramp the current up through lab view to +10 amps crteating a magnetic field.The problem is I would now like to drive the current to -10 amps, the simple solution is to obviously switch the wires around on the supply but I wish to perform an automatic sweep utilising lab view from -10 to +10 amps. I am sure that there is circuitry out there to perform this operation. If anyone knows where and how to utilise this circuitry with labview I would be much obliged.
Thanks
Regards
Marc

You might want to check into NI's USB based DAQ. Since you are ramping using GPIB to control the supply I'm presuming that it is changing relatively slowly, which would allow the USB DAQ. I don't know what their price is in the UK, they start out around $245US with both analog and digital. You would also need a relay with: contacts rated at the maximum current expected, which should also be powered by a separate power supply and have its own driver circuitry (DAQ cards generally don't supply sufficient current to run relays directly). A US company, ELK products, makes a relay card with the appropriate circuitry, for about $20 US. I know that one model, ELK-924, has contacts rated to 7A @ 30VDC, I don't know if that is "hot switched" or just what they are rated for. I think hot switched as they have a separate 10A @125VAC rating. You would need a small 12V @~1A power supply to provide it with power (a "Wall Wart" supply should be fine), but it only requires the control signal to supply 1.2mA, with most DAQ digital I/O capabilities. You would need to be careful not to switch the relay while the electromagnets full current was flowing, the field collapse would generate a large voltage/current across the relay's contacts. The normal method of putting a reverse diode across the windings wouldn't work with your required polarity reversals.
Hope this helps,
P.M.
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion

2500 router power supply schematic?

Hi All,
Does anybody know where I can get one? The actual part number is prw-2500-ac. Thanks, sh

could someone test their power supply with a volt meter for me?
I have 2 routers. I'm using one of them, but the other doesn't have a power supply. I wont be needing that other one for a little while yet, but I want to make sure it works.

G5 20" iMac Power Supply Issues Again!

Well, both of our old G5 iMacs have had the logic boards replaced under the extension repair program. Also one of of them had the PSU replaced as well under the same program. Well, now the other one has gone south. I pulled the power supply out and it had several bulging capacitors so I replaced them. However, I also noticed that there is a fried surface mount transistor right next to position R4 on the under side of the board. I've replaced the caps but I can't figure out the values of the fried transistor. I've taken some pics of it. I'm really hoping to track down the part and fix it myself. However, if not, might anyone have a replacement PSU for this 20" imac or know where I can get one inexpensively?
2nd question:
I went though the process of a service agreement on the Apple site. I entered the problems and got to the final page and it quoted me $74.95. However, I'm not sure what this charge is for. Do I ship the entire iMac in? or is this for a replacement PSU? I'd really like to make a trip to the Apple Store but we're stuck at home with a newborn for the next several days.
Anyway, any information would be great.
Thanks much,
Robet
Message was edited by: RRack

Hey Robet,
service agreement on the Apple site. I entered the problems and got to the final page and it quoted me $74.95
Hmm but you wouldn't have a service agreement on this machine. Call as DaddyPaycheck suggests.
I also noticed that there is a fried surface mount transistor right next to position R4 on the under side of the board. I've replaced the caps but I can't figure out the values of the fried transistor.
Wow you must be pretty good to want to try to replace that SMT transistor! I'd be afraid that there would be other damage as well: diodes, power ics, switch mode chips etc. I've got 4 G5 supplies here and only one worked after the cap swap. I didn't feel trouble shooting the entire supply was worth the time.
What I've done is more on the lines of this:
http://gallery.me.com/iamkimc#100033
Actually any ATX (non Dell) supply will work.
I extract 2 12V leads from the hard drive power plug using a pin extractor like here:
http://www.amazon.com/gp/product/B001KQDS6G
I bought this but so far only use the top one. It works well. If you're only doing a few you can use some of the tricks here:
http://www.xtremesystems.org/forums/archive/index.php/t-88644.html
If you look at the iMac G5 ALS pinout:
http://www.xlr8yourmac.com/images/imacg5power_supplypinout.gif
and compare it to the 20 pin ATX:
http://www.subedartech.net/docs/pc/connectoratxpinout.GIF
On the right you see that the difference in the first 20 pins is: Pin 12 -12 VDC and Pin 18 - 5VDC. So I extract those two pins clip them off. Shrink tube the ends and replace them w/ 2 yellow leads (+12VDC) that I extract from the hard drive leads. Once cleanly extracted they just push and lock in place.
Note that pins 11 (black, ground) and 22 (Brown + 24VDC) are not covered. If you have the early ALS you don't need these two leads (go figure) but if you have the later or 20" you need a separate supply for those leads. I use a old 24VDC PowerBook supply for that. Model M7783 it puts out 24VDC at 1.0A.
It's kind of messy but all the parts fit behind the iMac and aren't seen.
Also it seems like you're watching your pennies w/ the new baby. (been there)
we're stuck at home with a newborn for the next several days
More like months with us.
Good luck and I hope you're sleeping.
Richard

NX 5K Power Supply

Hi all,
I replaced a new PSU I received from Cisco to replace a failed PSU. I issued this command "sh env power" but the new PSU isn't listed and the parameters for the Power show "0". The LED indicator is showing green and I didn't reboot the sw.
I was wondering if anyone has info on why this symptom. I'd really appreciate the input.
Best, ~zK
sh ver
Cisco Nexus Operating System (NX-OS) Software
TAC support: http://www.cisco.com/tac
Copyright (c) 2002-2011, Cisco Systems, Inc. All rights reserved.
The copyrights to certain works contained herein are owned by
other third parties and are used and distributed under license.
Some parts of this software are covered under the GNU Public
License. A copy of the license is available at
http://www.gnu.org/licenses/gpl.html.
Software
BIOS: version 3.5.0
loader: version N/A
kickstart: version 5.0(3)N2(2a)
system: version 5.0(3)N2(2a)
power-seq: Module 1: version v4.0
Module 4: version v0.0
uC: version v1.0.0.2
SFP uC: Module 1: v1.0.0.0
BIOS compile time: 02/03/2011
kickstart image file is: bootflash:/n5000-uk9-kickstart.5.0.3.N2.2a.bin
kickstart compile time: 10/15/2011 9:00:00 [10/15/2011 09:44:53]
system image file is: bootflash:/n5000-uk9.5.0.3.N2.2a.bin
system compile time: 10/15/2011 9:00:00 [10/15/2011 11:35:57]
Hardware
cisco Nexus5596 Chassis ("O2 48X10GE/Modular Supervisor")
Intel(R) Xeon(R) CPU with 8299528 kB of memory.
Processor Board ID FOC154055Y4
Device name:CA_VAC_AS_01
bootflash: 2007040 kB
Kernel uptime is 5 day(s), 9 hour(s), 56 minute(s), 56 second(s)
Last reset
Reason: Unknown
System version: 5.0(3)N2(2a)
Service:
plugin Core Plugin, Ethernet Plugin
CA_VAC_AS_01# sh en power
Power Supply:
Voltage: 12 Volts
PS Model Input Power Power Status
Type (Watts) (Amp)
1 AC 0.00 0.00 ok
2 N55-PAC-1100W AC 1050.00 87.50 ok
Mod Model Power Power Power Power Status
Requested Requested Allocated Allocated
(Watts) (Amp) (Watts) (Amp)
1 N5K-C5596UP-SUP 648.00 54.00 648.00 54.00 powered-up
4 N55-M16UP 90.00 7.50 90.00 7.50 powered-up
Power Usage Summary:
Power Supply redundancy mode: Redundant
Power Supply redundancy operational mode: Redundant
Total Power Capacity 1050.00 W
Power reserved for Supervisor(s) 648.00 W
Power currently used by Modules 90.00 W
Total Power Available 312.00 W

Interesting question.
Very short answer:
CPU fan.
Longer answer:
1. I use smcFanControl to control the speeds of my 3 fans in my iMac (2.8 GHz)
2. My "standard" settings are:
CPU fan: 1600 rpm
Hard Drive fan: 1600
Optical Drive fan: 1100
and my "typical" power supply temp is 65° C.
3. I did an experiment and bumped each fan separately up to its maximum speed.
a. Optical Drive fan: from 1100 -> 4400
PS temp: from 65 to 64
b. HDD fan: from 1600 -> 5500
PS temp: from 65 to 68 !! Oops.
c. CPU fan: from 1600 -> 3300
PS temp: from 68 to 42. Yea! But, it is noisy.
4. I then dropped the CPU fan speed to 2000 rpm and the PS temp is now at 52. I can hear the fan, but barely.
I am glad that you asked this question as I have reset my standard to 1800 rpm for the CPU fan. It is quiet and I appear to have a 10° C drop with an increase of 200 rpm.
One thing is clear to me. Apple's default fan speed settings are too low. We should not have to buy smcFanControl to extend the life of our iMacs, the proper speeds should be built into the machine/firmware/software.

Power supply control

Hi
I have to control 10 gear boxes at a time and I have used E3436A power supply to supply 5.3V dc to all gear boxes. Once I start test gearboxes will powered on and generates the analog out pulses.
Now I have to cut the power supply to gearbox once it produces the 40 analog pulses / min (even less time its fine). After some time say 5 to 6 sec again I need to power on the gearboxes to continue the test..Its repetitive over period of time.
To power off the supply of individual gearbox I am using USB 6009 Digital IO ports with enabling and JFETS or relays.
The problem is.
1. I have to check the status of all gearboxes(10) have generated 40 pulses /min.
2. If the gearbox 1 is generated 40 analog pulses in 30 sec I have to cut the supply to particular gearbox and wait for 1 minute, same way I have to off all 10 gearboxes using DIO and relays .
3.if the gearbox taken more than 1 min to generate 40 pulses ...It indicated fail..
4. After completion of one cycle (1 min) I have to start the all the gearboxes simultaneously ( No DIo and Relay used..Direct supply from the E3466A ) .
Pl let me know logic for controlling the gearboxes.
Thanks in advance

You were told in another post http://forums.ni.com/t5/LabVIEW/Power-supply-switching/m-p/2490462 to come up with your own code.
Nothing has changed.
If you don't know LabVIEW take a class

Do all Sun Servers come with switch-mode power supply?

I was posted this question by my customer and i was dumb founded. Can anyone help me on this? Thank you!

I'm not absolutely certain I understand the term "switch-mode".
If they are referring to a power supply that can auto-sense the input voltage, such as whether it can function with 115VAC versus 230VAC, then the answer is "maybe".
Recent workstation systems will have that.
Smaller server systems will have that.
Mid-sized servers may or may not have that.
An example: Sunfire V480's were auto-sensing, whereas the V490's require a nominal 200-240VAC.
Another example: the Ultra 5 and Ultra 10 workstations had power supplies that required you to slide a selector switch.
You are going to have to provide specific models, to get accurate answers.
Alternatively, just look it up in the Sun System Handbook.

Power supply vs. logic board? turns off in sleep mode.

My imac g5 (2004 - 1st generation?) is either turning completely off or going into some un-wake-up-able mode after it's put to sleep. (I have to switch off/on the power strip and turn the computer on all over again.) And sometimes if it's sleeping (power light pulsing on front) it may or may not wake from sleep by pushing the power button. Often touching a key in that circumstance will cause it to crash, so I've quit using that altogether as a method of waking it up. I've reset the SMU a number of times throughout the past few months and it has not cleared up this problem.
Last night after I put it to sleep it switched in to the un-wake-up-able mode. I could still hear something running (not a fan, just an electrical hum) where it seems like it's crashed and can't shut itself off. I had to turn off the power and try to turn the computer back on. It wouldn't respond the first couple times. Then the power light glowed for a while but it still didn't turn on completely. After a few more minutes I tried again. Maybe I held the power button for too long, but I heard a long single beep, the fans whirred, and then everything started up as usual.
I've read a number of threads seemingly related to these issues, but am now not clear about whether this is a power supply issue or a logic board issue. I have yet to open the back and check for bulging capacitors. Just thought I'd ask here first.

I am having a very close issue too (posted also in a more recent thread about power button not functioning). My old iMac G5 20 inches got a power supply that went bad two years ago. I had it replaced and all went fine until two weeks ago.
My wife was using it, while I was away: machine shut down with a 'pop!' sound.
She tried to start it up again, but after pressing the button a couple of times - the last one longer - she had a long strong peep. The machine went on for a while and then off again. Scared, she left it off.
After checking, no reported issue seems to fit to the problems shown: power supply is working; logic board too. The machine is working fine, but on sleep, it dies out. While doing tasks, at undetermined times, it shuts down with a 'pop!'. Sometimes you can restart it immediately. Sometimes you can't and have to wait one or more hours. No evidently bad caps on board, led check returns 1 (no 2 flashing or attempting to turn on) with dead computer, otherwise all working fine. Hardware test also passed. Console messages have nothing relevant or clearly understandable to offer.
Still can't figure out a solution. Many user are pretty fast in suggesting to bringing the machine to Apple. Unfortunately not all around the world we have/need cars. And getting the 20 kg of iMac by feet/metro to the shop it ain't such a nice walk. When I fried the power supply, there was no sufficiently large box on sale to pack the computer and have it send to the shop. I had to wait for the technician - on a convenient day - do drop by and take it (and he knew he was going to repair it)!
Will post, if I have further developments.

%PLATFORM_ENV-1-PWR_RPS: Redundant power supply faulty or in standby mode

Hi All,
We are getting the below error on our Cisco 3560 Switch and the device is running on the image ":c3560-ipservicesk9-mz.122-55.SE4.bin".
010790: Mar 2 00:19:35 PDT: %PLATFORM_ENV-1-PWR_RPS: Redundant power supply faulty or in standby mode
010791: Mar 2 00:24:35 PDT: %PLATFORM_ENV-1-PWR_RPS: Redundant power supply faulty or in standby mode
010792: Mar 2 00:29:35 PDT: %PLATFORM_ENV-1-PWR_RPS: Redundant power supply faulty or in standby mode
010793: Mar 2 00:34:35 PDT: %PLATFORM_ENV-1-PWR_RPS: Redundant power supply faulty or in standby mode
010794: Mar 2 00:39:36 PDT: %PLATFORM_ENV-1-PWR_RPS: Redundant power supply faulty or in standby mode
010795: Mar 2 00:44:36 PDT: %PLATFORM_ENV-1-PWR_RPS: Redundant power supply faulty or in standby mode
010796: Mar 2 00:49:37 PDT: %PLATFORM_ENV-1-PWR_RPS: Redundant power supply faulty or in standby mode
010797: Mar 2 00:54:37 PDT: %PLATFORM_ENV-1-PWR_RPS: Redundant power supply faulty or in standby mode
DCSW#sh env all
FAN is OK
TEMPERATURE is OK
SW PID Serial# Status Sys Pwr PoE Pwr Watts
1 Built-in Good
SW Status RPS Name RPS Serial# RPS Port#
1 Standby <>
Kindly help me on how to fix this issue and what to do next?

Hi Senthil,
What are the LED status on RPS. It looks like RPS may have gone faulty. How many switches are connected to it? Possibly a reset of RPS could fix this issue, else replace it.
Thanks,
M

CNA & "switch redundant power supply"

Just configured trunking between these switches:
2950T-48-SI
3508G-XL
3548-XL
The traffic appears to be flowing correctly through both the default VLAN and also my additional VLAN.
Now, ALL of the 2950 switches on my network display this message: "switch redundant power supply failed" when I connect to them using the Cisco Network Assistant.
Seems like the error message must be related somehow to the VLAN configuration I did.
In a nutshell, I configured all connected Gigabit ports this way:
switchport mode trunk
switchport trunk encapsulation dot1q
I only configured SOME of my switches for the trunking and additional VLAN - must all of them be configured the say way, even if I don't anticipate needing the additional VLANS on those switches?
Thanks, Susan

Hi Susan,
Do you have redundant power supplies connected to the 2950s?
If not, you are probably running into a cosmetic bug, CSCee96721.
We can confirm this by issuing a "show env" in the CLI.
You should see something like this:
"switch#sho env all
FAN is OK
Internal POWER supply is OK
RPS is NOT present
RPS is FAULTY"
Note that the last line indicates that the RPS is faulty, even though the line above it indicates that no RPS is present.
If that applies to you as well, then you are hitting this bug. CNA is polling the same information, which is why you are seeing "switch redundant power supply failed" in CNA.
The fix is in 12.1(22)EA3 and later.
HTH,
Bobby
*Please rate helpful posts.

HT1490 When my macbook is fully charged, does the charger switch the power supply off, or does it continue to 'charge'?

When my macbook is fully charged, does the charger switch the power supply off, or does it continue to 'charge'?
(If I leave my laptop to charge whilst I'm out and it reaches 'fully charged' but is still switched on, will this continue to 'charge' my laptop? Or will it destroy my batter over time?)

When the charge cycle completes, the pilot light on the MagSafe connector changes from orange to green. At that point the battery will be kept in standby mode, and the computer will be kept running with electrical power from the charger. If you want to keep an eye of where the power is coming from, get the latest release of the Coconut Battery utility: http://www.coconut-flavour.com/coconutbattery/

HT204154 My macbook with thunderbolt display without power supply stops working on battery mode, is that normal?

I use a 27" Thunderbolt display on my macbook pro. If I disconnect the power supply from the mac, the monitor stops working.
Is that normal or do I have to make some changes on the setup ?
Thanks
+GL

Greetings koningsvaren,
Welcome to the Apple Support Communities!
I understand that you connect your MacBook Pro to an external Thunderbolt display and everything works as it should while connected to power, but once power is removed from the MacBook Pro, the second display no longer functions. It sounds like you may be using this configuration with your MacBook Pro closed, otherwise known as closed-clamshell mode. In order to use a second display with your Mac portable in closed-clamshell mode, the Mac portable must be connected to power. Please refer to the attached article for more information. If this is not the case, please let me know.
How to use your Mac notebook computer in closed-clamshell (display closed) mode with an external display - Apple Support
Cheers,
Joe

21 September, 2014: MD513AE/A iPad Wi-Fi-16GB White - Model A 1458 I have purchase this from Dubai, UAE, some 2 years back. ---- I am NOT able to switch it on; when connected to power supply, the battery icon comes in but no signs of charging.

21 September, 2014, from India.
MD513AE/A iPad Wi-Fi-16GB White - Model A 1458
I have purchase this from Dubai, UAE, some 2 years back.
I am NOT able to switch it on; when connected to power supply, the battery icon comes in but no signs of charging.
After some times the ‘Apple’ icon comes in. Tried simultaneous operation of Sleep and Power buttons, but of no use.
Sometimes a picture of cable and ITunes comes in; but not able to connect to
P C as there is no battery charge.

Hi madhu254,
Thank you for visiting Apple Support Communities.
If your iPhone is not charging, please check out this article.
iPhone and iPod touch: Charging the battery
There's a Resolving issues section, but you may want to read it all.
Best regards,
Nubz

Router power supply: Switch mode or linear?

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