Second was only 500mA. You may have heard the Arduino can be powered by 9V external source, but the on-board power regulator actually allows for 9-12V, so the 12V from a desktop PSU should be fine. Encyclopedia of ATX to Bench Power Supply Conversion : This guide has almost every ATX computer power supply to bench power supply published to date on Instructables ( as of Dec 2014, about 70 unique instructables). Also make sure that the metal box of the PSU is correctly earthed or grounded. Drain the power and open the power supply. Your pwsply will shut off due to the optocopler, and will recover when no short is ditected.
6. Your post will be seen not only by myself, but by a large group of tech enthusiasts who can quickly answer your question. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. The purpose of the resistor is to draw a “trickle current” from the power supply, otherwise, it may not turn on. Alternatively, you can dismantle an old computer and remove the power supply from the case. Green = PS_ON# (turn DC on by shorting to ground). I hope you don’t mind, but I created a 3D model with the panel layout at https://www.thingiverse.com/thing:4628093. Thanks for your video it is explained very clearly, i go make one. I brought out an additional 5-volt (red) and ground(black) wire to attach to the power resistor that I’m using as a load. A PC power supply (PSU) requires AC power. The fan on a PSU can be quite loud; it's designed to cool a relatively heavily loaded PSU as well as the computer.
Thanks, You can keep the 20-pin Molex connector attached and connect directly into it or cut it off completely and group together the individual wires keeping the same colours together, reds to reds, blacks to blacks etc.
Easy to connect on-board standard 24pin ATX port; just plug-in, and you're ready to go. I have been scrapping these power supplies from computers and using them in my high current LED displays (3W RGB LEDS). Be very careful around the black capacitor caps and all the wires leading to them.
Connect the yellow wires to the +12 V binding post. mit wieviel Ampere hast du die 3 Ausgänge jeweils abgesichert? If you only have three red wires, another wire (sometimes pink) must be connected to them. So, brilliantly you did this: I am using say 12 v +, rather than plug my load to the LOWER 12 v+ and it’s ground I used your magic cable to connect the 12 v to the METER left binding post. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. The video indicates it might not be needed, though doesn’t note why that might be. Does the computer power on? One thing to look out for is that the meter uses a shunt in the ground connection to measure current. Connect a red wire to a 10 ohm power resistor, then connect it to a black ground wire. very informative !guess there are many reasons people use expensive SMPS. How do I know what power supply to use for my lab power supply? I have tried 10w but with no success
When building a circuit of any kind, any components you add to your circuit cause a drop of 0.6volts. Conveniently, that's exactly what a computer power supply does too - only with a lot of different connectors and coloured wires.
The comment form collects your name, email and content to allow us keep track of the comments placed on the website. Remember, there is lethal voltage inside the power supply box and it also has been designed to dissipate heat correctly. Every workbench should have at least one power supply. Make sure you don't put any holes where the binding posts will be touching anything on the inside of the power supply. I’ve breadboarded this and got it working. Even when the power is off, there are large capacitors that can store lethal electric current for weeks, sometimes months, after being turned on. Your fan will now be spinning significantly slower and thus quieter, but still provide some cooling. Note that I decided to use the Standby voltage to power the meter, I need to do that because the module requires 4.5 to 30 volts to work and my lowest supply voltage is 3.3-volts. I decided to take it and mount it on my panel so I could patch it into whatever output I wanted to monitor. Please note that all comments may be held for moderation. Avoid making embarrassing mistakes on Zoom! The unit I will be experimenting with uses an older 20-pin power supply connector. Of course, you could replace it with a single pole triple throw switch, assuming you can find on that is rated to handle the current. As for the volt meter / amp meter I would get one that covers the voltage range that you need to and the same with the amp range. Pay attention to the colors of the wires as they are standard and will help you confirm their identity.
I also won't be using the purple or grey wires, instead wiring a 12V illuminated switch. While a commercial bench power supply is certainly a worthwhile investment there is a cheaper solution that you might want to consider. I do not know if my 8 ohm power resistor was having too much current run through it. No worries - the fan itself was fine, but the controller circuit was broken, so I opened it back up and spliced the fan directly to one of the 12V lines. Prices Today for a lab power supply well exceed $180.