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Calibrate power supplies

I have a bench power supply (linear 20Vdc max output), I need to gave an accurate output for some applications so how do I calibrate it?thanks

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SOURCE: no power on my VT-300ATX powersupply

If you're trying to just plug in the wall power cablem without connecting the motherboard it will not work. Switching power supplies need to detect a load (device) otherwise they will not put out power. Safety feature.....

Posted on Apr 05, 2007

  • 51 Answers

SOURCE: power supply for gateway

Power supplies are easily replaced by anyone handy with a screwdriver.
You should be able to find a suitable power supply on eBay for @$20 U.S. new.
If it were me, I'd go with one in the 200 or 250 watt range.

Posted on Nov 11, 2007

  • 50 Answers

SOURCE: No Power of a Compaq Presario Computer

Make sure that the power button is conected to the right prongs on the mother board. On the writing next to the prongs it should say power.

Posted on Feb 24, 2008

  • 19396 Answers


230 Watts.
Here are specs and replacement:
230W ATX Power Supply - PS-5201-5D - HP-233SNF ...You can also replace it with a compatible 300 W psu.

Posted on May 27, 2008

  • 59 Answers

SOURCE: have an hp pavilion desktop that wont power up.

You can purchase a power supply tester, they are not that expensive. Here is a link for some and if you want you can shop around. Make sure to get a 20/24 pin tester.

Also if you do have a bad power supply here is a replacement.

Hope this helps you out.

Posted on Mar 01, 2009

  • 2 Answers

SOURCE: i need datasheet for AT2005 IC

one reference indicated AT2005 is the same as WT7520. I think WT7520 datasheet has some errors, but have found no one to ask about them. I need schematic of Powork PW-600, using WT7520; and a better WT7520 datasheet.

Posted on Mar 08, 2009

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Dear Guru my power supply of my computer with model enp-2120d doesnt work no power output so please gave me some idea or schematic diagram,thank you.

Do not try to fix this power supply. Better to replace with new or good used. I see many on ebay from 13.50 to 25.00. Also google that model for other options. Most likely fuse on the power supply has failed but if you bypass the fuse, with jumper wire or another fuse, will blow again. Probably capacitors. Good luck

Aug 28, 2011 | Enhance Technology ENP-2120D (ENP2120D)...

1 Answer

Looking for schematics of ATX200-3516 ASTEC power supply. When i plug in a dc motor i have a peak of current firstly more than 6 Amps (6 amps is max rating at 12 Volts in such supply). So It shut the...

If your power supply is rated 6 AMPS and your motor is rated 14 amps peek, then when that motor starts it will draw the 14 AMPS, That will trip the power supply right then and there. After it runs a few seconds the AMPS will drop about ½ that, but still 7 AMPS is more then the power supply is rated, so you will need a different power supply.

Aug 08, 2011 | Astec (ATX200-3516) (ATX2003516) Power...

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Dear Sir, I have astec model AA23160 power supply input Ac 100-240 5A max output Dc +5v 23A, +12v 22A max it does not give output the LED give yellow when it is ON. the two cooling fans were also not...

Hi! l have have the same problem whit the Asctec model AA23160 power supply.But l need to know how many time your power supply worked: How many time do you use it?

Aug 13, 2010 | Astec 300w AT Power supply 190170-01...

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I need a simple bridge-type power supply design that produces a DC output voltage of 3V,7.5V and 9V. Just for project purposes.

hi there! i found this application note of ST Micro regarding power supply design. i found it very comprehensive. i hope this helps.
regards, lucgalman

Oct 12, 2009 | System Power Supplies

1 Answer


Dimensions 5.9"W (150mm) x 3.4"H (86mm) x 5.5"D (140mm)
Special Features Dell Proprietary Main ATX & 6 Pin Auxiliary Connectors
AC Input 100-120V/7A 60Hz 200-240V/3.5A 50Hz
DC Output Voltage 3.3V 5V12V
Total Output Max Load 200W


Jul 20, 2009 | Dell - NPS-200PB-73M (NPS200PB73M) Power...

1 Answer

Re: Pyramid PS-36kx power supply buzzer sounded,red light came on

Hi! I saw your question, and maybe this will help. I also have a Texas Star 100w amp, and this same power supply. Even though the nominal draw for your equipment is way below the rated amp flow of the power supply, when you key up, and the output on the amp is at max, you are drawing the limit of your power supply! Try running this setup at a lower linear output. You don't need the full 100 watts to get out! 60-80 watts is aplenty! You should start at a low output, and slowly increase the output(while keyed up), untill the power supply starts to complain.(buzzer/light). This is what your limit will be. The only other cure, is a MUCH bigger power supply. Unfortunately, I cannot afford a 60-90 amp supply, so this is what I am forced to do to use the one we have. Also,keep your cb's output very low when using the linear amp. These amps are supposed to get a low signal from your radio, or the linear amp is overdriven. (noisy and unstable. Hope this helps you! 73's to you! jimsjinx

Apr 30, 2009 | Pyramid (PS36KX) 600-Watt Power Supply

1 Answer

Designing a linear regulated power supply

what you are doing is over **** for 300 mA, now if you will pulling some real wattage then you would need linear regulation.
just use a 10.00 ac adapter . or a zener diode .
the calculations in real time analysis is complex GE has the formula online . but a spike at 300ma will be assorbed by the transformer easilly. if you are protecting delicate circuit then a fuse will not work quickly enough , fry and blow is all they do.
a crowbar circuit is what most designers use and efficient.
There are plenty of IC regulators on the market that will give these specs but I think your are over thinking your needs unless you have an exact spec for medical research.

Feb 13, 2008 | System Power Supplies

2 Answers


Maximum output of any smps is not based solely on the type of power switching transistors used. One of the parameters which will be crucial is the Ic (Max collector current rating). But this by itself isn't the lone determining factor either.

Other design factors which will come into play are the switching transformer, its size and windings. A smaller transformer and smaller wire gauge windings will generally mean lower max power output.

Max power output measurements probably require a set of load resistors, volt and amp meters, monitoring the 3.3, 5, 12 volt lines.

I'm not an engineer, but have had numerous computer power supplies apart, repairing some, junking some. Quality of construction or lack thereof is generally obvious. PC Power and Cooling probably builds high quality units. There are plenty of cheap, low cost power supplies which frequently die after a year or two, sometimes taking a motherboard down with it.

Dec 21, 2007 | Compaq Refurbished 280WATT POWER SUPPLY...

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