Laboratory power supply from a computer's ATX unit
If you have an old computer power supply (ATX) at home, then you should not throw it away. After all, it can make an excellent power supply for home or laboratory purposes. Refinement will require a minimum and at the end you will get an almost universal power source with a number of fixed voltages.Computer power supplies have a high load capacity, high stabilization and short-circuit protection.I took such a unit. Everyone has such a label with a number of output voltages and maximum load current. Basic voltage for continuous operation 3.3 V; 5 V; 12 V. There are more outputs that can be used for a small current, this is minus 5 V and minus 12 V.You can also get the voltage difference: for example, if you connect in to "+5" and "+12", then you get a voltage of 7 V. If you connect to "+3.3" and "+5", you will get 1, 7 V. And so on ... So the line of voltages is much more than it might seem from time to time.The color standard is, in principle, one. And this scheme of color connections for 99 percent will suit you. Maybe something will be added or removed, but of course everything is not critical.It's all simple, so do not be afraid. The first thing to do is to disassemble and connect the wires by color. Then, according to the scheme to connect the LEDs. The first one on the left will indicate the presence of power at the output after switching on. And the second one on the right will always light up while the mains voltage is present on the unit. Connect the switch. It will start the main circuit by shorting the green wire to the common one. And turn off the unit when it opens. Also, depending on the brand of the unit, you need to hang a load resistor 5-20 ohms between the common output and plus five volts, otherwise the unit may not start due to built-in protection. Also, if it does not work, be ready to hang up such resistors for all voltages: “+3.3”, “+12”. But usually one resistor is enough to output 5 volts.
Pinout of computer power supply outputs
Alteration has begunWhat do we need?
- - Screw terminals.
- - Resistors 10 W and 10 Ohms (you can try 20 Ohms). We will use the composite of two pentavat resistors.
- - Heat shrink tubing.
- - A pair of LEDs with damping resistors 330 Ohm.
- - Switches. One for the network, the second for management
Computer power supply completion scheme
Let's startRemove the top cover of the case. We bite the power connectors that go to the motherboard of the computer and other devices. Unravel the wires by color. Drill holes in the rear wall under the terminals.For accuracy, we first go through a thin drill and then thicker under the size of the terminal. Be careful, do not put metal chips on the power supply board.
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