Just didn't work well at all with many things. Therefore, I present a simple modification of an AT or ATX PC power supply to an adjustable bench power supply of 3 - 15V with a proper regulation and an output current corresponding to the original 12V output. You can also have another LED (Green Works Best) to light when you turn the PSU on. (This was at hand). How does the DHT11 hold up against the DHT22 and BME280 for ESPHome projects? The downside of a bench power supply is that they are heavy, bulky, and can cost a pretty penny. Just for safety's sake your AC maths need to be corrected. With it, You can turn any LED matrix or strip in to a display. 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. Inside the power supply… 4.6 out of 5 stars 244. You can't simply switching to amp cause you'll short-cut the circuit. But it turns out a obsolete computer power supply is perfect for the job instead. I believe I shorted the negative and the ground, but all I know for sure is that I got a giant spark. Prices Today for a lab power supply well exceed $180. I just have an old ATX power supply on my bench. 3 years ago. Have a great day. But it turns out a obsolete computer power supply is perfect for the job instead. A little update to the enclosure I am planning on 3d printing. Just wanted to say thanks for your instructable it is very helpful despite the above mentioned bad grammer, (not an english teacher by the way!). English Teachers may want to look away nowYour going to need:TapeScrew DriverComputer PSU (I recommend 250W+)PSU CableWire SnapsSoldering IronA 10ohm, 10W or greater power resistor (Some new power supply's don't work properly without some load so this can provide that)Optional:Switch2 LEDs of any colour (Red and Green is the best)If your using the leds you need a 1 or 2 330 OEM Resistor(s)Heat Shrink TubingExternal Enclosure (Some people cram it all inside the Power supply case or you can put it in a external enclosure. Did you make this project? The wires on the main … Connect the grey wire to the anode of your power … Aquire an ATX power supply. You will notice a few more coloured cables (namely purple, grey, brown, and green) of which only the green one is of interest to us. My personal setup includes many Zigbee devices as well as integrations with existing products such as my Android TV box. That is why DC-DC buck converters exist. That way you can exclude any power circuit until it is time to build the finished product. - not all power supplies of this type share a common return between +/- 12vdc outputs, also they may not have the same current rating between the two outputs. There are a few reasons why I consider ATX power supplies to be perfect for projects using an I suggest now adding Two terminal blocks so you can wire devices directly in. 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. While there’s nothing wrong with wiring everything up while prototyping of your project, it’s much easier to use a bench power supply for testing purposes. The only connector needed for this ATX to bench power supply conversion is the largest one with 24 pins. I would really like to have a variable power supply. Eventually it broke so the next time I will use a regular 24v transformer for this job. May cause probes, connections etc. But it turns out a obsolete computer power supply is perfect for the job instead. Reply Any old ATX computer power supply will do the job as they output 3.3 V, 5 V, and 12 V. You won’t have to modify the power supply at all for this to work and if you’re on a budget, all you need is a bit of wire to get started. I wish to use the 24V output (+12v & -12v) connected to a StepDown module XL4015 to obtain a Voltage Regulator. First thing is first. Recommend a fuse be used. To provide this load solder a red wire to one end of a 10 ohm, 10 watt resistor and a black wire to the other. 2. What started of with a Raspberry Pi quickly became three Raspberry Pis and eventually a full-blown server. The final voltage will be your positive voltage minus your negative voltage: if you have 12V on one wire and 0V on the other, then 12-0=12V and if you have +6V on one wire and -6V on the other, then +6-(-6)=6+6=12. It was scary. They are perfect for general electronics.This is my first Instructable for what I think is a brilliant idea, I'm only 14 and i can build itWARNING: This will void warranty's and can shock you if you don't have your wits about youNOTE: This Tutorial is littered with bad grammar and spelling mistakes. If fiddling around with wires isn’t your thing, there is a more elegant solution available. Since it isn't power computers anymore and doesn't heat up as much you can snip the red wire of the fan and connect the orange 3.3v wire. My version of this build. I don't understand some of these features, or what exactly this module is capable of. Bench power supplies will often use a miniscule fan which has to spin fast to keep up. The voltage feedback is connected to pin 1 of TL494 control chip (or its equivalent KA7500, KIA494, DBL494 ...). Binding Posts2nd is using binding posts to connect equipment. If you do chose this option I would suggest a sleeve over the Crocodile clips to prevent short circuits.Tips and Troubleshooting:- Dont be a bit afraid to spice the box up a bit, you could add leds, stickers or anything!-Make sure you are using a ATX Power Supply. Preparing an Old ATX Power Supply. The XH-M229 can also be found for sale on AliExpress where it will cost you less than $3. Build an essential piece of equipment for next to … 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. The answer is, you simply bridge the green wire (there is only one) and any black wire (ground). The resistor will reduce the voltage down to stop it damaging the LED. It doesn’t have to be that way because you might already have the perfect bench power supply for your ESP8266 and ESP32 projects lying around and collecting dust somewhere in your home. Please discharge the power supply by letting it sit unconnected for a few days or connecting a 10ohm resistor between the red and black wires.If you hear buzzing when you turn on the power supply it means there is a short or another serious problem. There are a number of ways to convert a standard computer ATX power supply unit into a usable bench top power supply. This was my first project in electronics three years ago. Dr.meter Triple Linear Variable DC Power Supply. Connect a red wire to a 10 ohm power resistor, then connect it to a black ground wire. Do not rely on the -12v line for power! You don’t have to twist any knobs or adjust and levers. There are a few reasons why I consider ATX power supplies to be perfect for projects using an ESP32 or ESP8266. I took measurement on 5V (red) and GND (black) on the PSU itself. Now take out the 4 screws on top of the case and take the wires out of the hole then group wires of the same colour together and snip off the ends.Just To tell you , you've just void your warranty. The reason that its 22v and not 12 is because it uses the Blue wire which is -12 volts not the common earth (black wire). ã 4 Output Voltages ã Providing quick access to 4 sets of typical output voltages, which including: 3.3V, 5V, 12V and -12V. If you've built a bench power supply using an old ATX computer power supply, you may feel limited by the choice of voltages + 3.3V, + 5V, and +/- 12V DC. You can then insert a short wire in to the two pins. Which cable you choose has no influence on the outcome, as long as you make sure you have the right colour. If your really against using a switch then just tape together the green and black wires.You can also use a 1 amp fuse. Stripping Down to the Bare Basics. As of this writing, a good quality and powerful ATX PSU (power supply … If you click through and make a purchase, Iâll earn a commission, at no additional cost to you. Since -12v is rarely used now, the outputs have been dropping off.And remember, when you start putting a load close to the max rated output, the voltage may drop somewhat. Suppose you're breadboarding a circuit that's meant to be run off a … The black wires all lead to ground. yes but unfortunately cost has very little to do with it. All you do it get the clump of black wires you'll be using and cut them somewhere along the wire and then bridge them with a fuse in a fuse holder.Some Power supply's need a load to work properly. I have learnt much since. 2 years ago. - make sure all metal parts of the enclosure are adequately connected to Protective earth. Second was only 500mA. If the wire is grey connect it to an orange wire, if it is pink connect it to a red wire. The power capacity of the -12 V output does not make it very useful for creating a general purpose 24 V. Also you would potentially enter into trouble with separate earth levels if you use that kind of 24 V in the same circuit as for example 5 V from the same supply. The voltage drop is from your extra components. Keep an eye on your circuit after you do this, if it produces too much heat connect the fan back up to the red wire.CONGRADS You have successfully finished your Power supply! Drain the power and open the power supply. It’s a very inexpensive way to make a pretty good DC bench supply or dedicated 12 volt supply for working on projects or powering devices. [TG] didn’t just cut off the motherboard connector and add banana plugs, but improved the functionality. 93 $4.99 $4.99. Test Your PSU & Enjoy! As an EE who has worked extensively with these power supplies in the industry, I would like to add or reinforce some cautionary statements here. It allows me to dial a voltage for those cases where I need say 6v or 9v. -Some modern Power supply's will have a "sense wire" this has to be connected to power for the Power supply to function. It's OK for small loads, but even a small fan may overload it. ã With Replaceable Glass Fuses ã Each output channel has replaceable 20A glass fuse and corresponding ground binding posts for easy connection. 4. Please beware: - use an external fire enclosure made of metal or some other material with a minimum fire rating of V-1 (ref. 1 year ago. This power supply will be able to give you a constant +5VDC,+12VDC,-12VDC and 1.2VDC-24VDC variable regulated voltage supply… Orange cables carry a +3.3 V signal, red cables carry a +5 V signal, and yellow cables carry a 12 V signal. You will notice that the wires leading in to the 24-pin connector are coloured differently. I wish to use the 24v output (+12v & -12v) connected to a StepDown module XL4015 to obtain a Voltage regulator. If you had an old volt meter you could wire it in to the output so it can tell you what voltage you are at.2. Identify the Wires on the 20 Pin (or 24 Pin) Connector. Does someone know the max Amp avaible in this combinaison?? Also it refused to show the right measurements with my multimeter. Nov 18, 2017 - Convert a Computer Power Supply to a Variable Bench Top Lab Power Supply: Prices Today for a lab power supply well exceed $180.
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