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.
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.
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.
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.
Connect the power supply of the computer to the connector for 20 pins. I dropped it from the old motherboard.
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.
You can turn on the power supply with any switch. I have a switch from the old TV.
On the front panel we drill holes for the galetny switch. Diameter 8 mm.
The connection indicator will be a LED. To limit the current to the LED you need a resistor, you need 150 Ohms.
Drill a hole under the LED. Diameter 4.5 mm, under the LED 5 mm. So tight will be installed.
In the side wall cut a hole for the connector.
Drill a hole for the switch above the case.Diameter 12 mm.
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.
As removable terminals I will use the sockets from the military connector SR. Immediately soldered wires to them and insulated.
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.
I attach the front panel.
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.
I solder the galetny switch according to the scheme. Everything is simple and affordable.
Solder the LED and switch. Now you can install everything in the case.
Socket glue for super glue with soda. Excellent glue is obtained, almost like epoxy.
Screw the back wall and get a great design.
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.
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