Voltage switch between computer power supply pins


When you repair a computer power supply unit or perform revision, you need to constantly make voltage measurements. It is also sometimes necessary to measure the resistance of the output voltages. I decided to assemble the adapter between the power supply and the multimeter. With such a device, hands will always be free and work will be faster. Also, this unit can be used to power low-power devices. The current is limited by the operating current of the switch.

Scheme


The scheme of the device is simple and assemble it is not difficult.
The input voltage comes to a 20-pin connector, and the output voltage is removed from the terminals. All voltages are switched by a jack switch. There is an indication of the power supply of the computer. The indication LED is powered by 5 Volt duty. The power supply of the computer is started by a switch.
Voltage switch between computer power supply pins

Switch fabrication


The device is mounted in any suitable case. I will make the case myself. I will make it out of PVC plastic. Plastic scored from advertisers, trimming discarded.
Voltage switch between computer power supply pins

Cut out the necessary parts of plastic and glue with super glue. It turns out such a letter "O". You also need to cut the front and back panels.
Voltage switch between computer power supply pins

Connect the power supply of the computer to the connector for 20 pins. I dropped it from the old motherboard.
Voltage switch between computer power supply pins

Switch the voltage at the output will galete switch PG-3. If it is possible to take the switch to 6 positions, then great. I have 11 positions, but what is, that is. Also found a handle on the switch.
Voltage switch between computer power supply pins

You can turn on the power supply with any switch. I have a switch from the old TV.
Voltage switch between computer power supply pins

On the front panel we drill holes for the galetny switch. Diameter 8 mm.
Voltage switch between computer power supply pins

The connection indicator will be a LED. To limit the current to the LED you need a resistor, you need 150 Ohms.
Voltage switch between computer power supply pins

Drill a hole under the LED. Diameter 4.5 mm, under the LED 5 mm. So tight will be installed.
Voltage switch between computer power supply pins

In the side wall cut a hole for the connector.
Voltage switch between computer power supply pins

Drill a hole for the switch above the case.Diameter 12 mm.
Voltage switch between computer power supply pins

At this stage I did not decide on the terminals for connecting the multimeter. Therefore, painted the body in black color, drill holes later.
After drying the paint, still drilled one hole. The photo shows.
Voltage switch between computer power supply pins

As removable terminals I will use the sockets from the military connector SR. Immediately soldered wires to them and insulated.
Voltage switch between computer power supply pins

The front panel will be glued with super glue, and the back will be screwed with small screws. To screw the screws, I glue the substrates of the same plastic as the case. Glue on super glue.
Voltage switch between computer power supply pins

I attach the front panel.
Voltage switch between computer power supply pins

I’m putting off the case for now and move on to unzip the circuit. All unsoldered according to the sketched scheme It is convenient to connect the power supply connector and unsolder the colors of the wires, respectively. Soldering places must be insulated.
Voltage switch between computer power supply pins

I solder the galetny switch according to the scheme. Everything is simple and affordable.
Voltage switch between computer power supply pins

Solder the LED and switch. Now you can install everything in the case.
Voltage switch between computer power supply pins

Socket glue for super glue with soda. Excellent glue is obtained, almost like epoxy.
Voltage switch between computer power supply pins

Screw the back wall and get a great design.
Voltage switch between computer power supply pins

Check switches


Connect the multimeter.Turn on the switch. We control the output voltage of the computer power supply. During the build process, I redid the sequence. So it seemed to me more convenient. The duty mode is duplicated. The LED lights up and the last position indicates 5 volts.

Related news

Voltage switch between computer power supply pins image, picture
Voltage switch between computer power supply pins 76


Voltage switch between computer power supply pins 37


Voltage switch between computer power supply pins 85


Voltage switch between computer power supply pins 22


Voltage switch between computer power supply pins 14


Voltage switch between computer power supply pins 88


Voltage switch between computer power supply pins 58