Provides quick access to the typical voltages needed including 3.3V, 5V, 12V and -12V. It is like AC mains power: it doesn't alternate between +230V and 0V 50 times a second (Europe) but it alternates between +115V and -115V 50 times a second. Bravo et encore merci Write a Review (requires login). Definitely “old school”.
Does the computer power on?
Remember, there is lethal voltage inside the power supply box and it also has been designed to dissipate heat correctly. All my connections are good, I just cannot get a voltage accross my power OK to ground.
Most purchasable breakout boards that I have seen have them all set to 5 amps. The power in wattage would be the voltage multiplied by the current. Now when the switch is pushed, the LED will still be lit, but instead of 12V being sent back out to the centre pin, the GND will be shorted with PWR ON, resulting in our PSU activating. When I switch the meter to amps however the fan on the box stops working ( I have to unclip the green wire and reconnect it to turn it back on. Look for ATX power supplies with a 20-pin connector, a 20+4-pin connector, or an AT power supply if you need -5V. Here's how. Many power supplies require a load to stay on - in this case, we can use a 10W 10 Ohm resistor to do the job.
Be very careful around the black capacitor caps and all the wires leading to them. The power supply is more useful with the ability to tap into either voltage, and each is regulated separately by the power supply.
Have a great day. The power supply fan should be silent as well.
With these costing you only $25 and having short circuit protection, thermal protection, Overload protection and varied output voltages of 3v, 5v and 12v but we will me modifying it to give out 1.5v to 24v.
How do I create a 17 volt ATX power supply? You can connect the same coloured wires together using crimp connectors or posts, is the same thing. There are a number of ways to convert a standard computer ATX power supply unit into a usable bench top power supply.
Désolé je ne parle pas votre langue. I also won't be using the purple or grey wires, instead wiring a 12V illuminated switch. % of people told us that this article helped them. As its name... Read More, Relays are electromechanical devices that use an electromagnet to operate a pair of movable contacts from an open position... Read More, principles of management and managerial economics, अध्याय – 1 वास्तविक संख्याए प्रश्नावली 1.1 प्रश्न (3), MPSC Recruitment 2018 – 172 Vacancies for Assistant Town Planner, UPSSSC Recruitment 2018- 694 Exercise Trainer/Development Team Officer. I’ve breadboarded this and got it working.
Unless you have some data on the wiring dont attempt this as you could get caught on the wrong end of a wire and get your head blown off.- PSU means Power Supply Unit-If the LED on the front doesn't come on chances are you have the leg wired up the wrong way around just switch the wires on the legs and it should light.
How would you modify your design to include these variables?
Thanks Keith! Even when the power is off, there are large capacitors that can store lethal electric current for weeks, sometimes months, after being turned on. ", "Info is good. Put it back together and test it. Bonjour Geoffroy Share it with us! 2 330-ohm dropping resistors for the LEDs, You also may elect (as I did) to open the supply and remove some of the wires you won’t be using, if so, Convert an ATX Computer Supply to a Bench Power Supply. I believe I shorted the negative and the ground, but all I know for sure is that I got a giant spark. knowing that the +12v rail can deliver 7A and the -12v deliver 0.8A. My Standby light is lit up and has a voltage across it. Simply useful and easy. The GND, +3.3V, +5V, and +12V plugs should be easy to wire up. Here's how. 50A shunt is bigger. Convert an ATX Computer Supply to a Bench Power SupplyIn your video you show a 50W 8RJ power resistor , but in the parts list 8-20 ohm 10w power resistor, which one is correct?
I wanted a power supply to use on my desk with a breadboard for electronics- based projects.
If you only have three red wires, another wire (sometimes pink) must be connected to them. I consider working on that to i order to power the usb port. I chose a very simple method of building the final product, I suspect that you can come up with something far more exciting but this design gets the job done. Your videos have been a great learning resource. The other two pins are GND, and both should be connected. Today, we're going to strip the PSU to its bare essentials, then add some helpful sockets onto the case that we can plug projects into. ( How do you wire them ???) Does someone know the max Amp avaible in this combinaison??
Also because I do not know how you wired these three nobs ( on top ) how do I know which voltage is producing… Read more ». You should observe the Standby LED is now illuminated.
Thank you very much!
Unfortunately you can not just have the wires left open, luckily both of these issues are easily fixed. I think the -12 +12 can cause some issues with sensible electronics. It's been a learning experience, and mistakes were made: you should learn from them.
I’m a systems administrator by trade and getting into the hobby of tinkering with small electronics.
Be sure to check the label. One thing to look out for is that the meter uses a shunt in the ground connection to measure current. 7.
Sorry for the misnomer..but you knew what I meant.
If your supply doesn’t require a 5-volt load on startup you can eliminate this. Illuminated SPST switches should have 3 terminals: one will be indicated either by a different colour or labelled and GND. Thanks!
I’d like to use an illuminated toggle switch for the power, but can’t figure out to wire it.
Some units also have voltage sense wires that also need to be connected. Is my power supply ok for this project?
This is unlike a regular power switch, would would actually cut the power coming from the source. Thanks to all authors for creating a page that has been read 2,433,740 times. This was the most useful piece of equipment since i've had it done. Green = PS_ON# (turn DC on by shorting to ground).
I have learnt much since. Older ATX supplies (like the one I’m using) have a -5-volt output as well as a-12-volt one, newer (24-pin) Type 2 models only have the -12-volt output.
Lab bench power supplies are very cost-prohibitive, but luckily power supplies for … Ensure that you discharge the capacitors. You can take advantage of the hole left by the power supply cabling, to install a cigarette lighter connector.
The resulting power supply will provide high output power. They are cheap and available from eBay or Amazon.
It might happen you create an electric arc at the low voltage outputs or fry the circuit you are working on, if you make any mistake. ground) have been repeated, this is done to increase the current carrying capability.
Great video and explanations. Thanks a lot for the instructions, I’ve done my one.
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