Otis Singleton
Soldering wires onto a power barrel plug can be challenging, and there are several methods that can be used. One common method involves stripping a short patch of wire and soldering it to the centre pin. For the outer tab, you can heat it until the solder flows, then press and merge a pre-tinned wire. Alternatively, you can fold the wire back to the clamping flaps and solder it to them. Soldering wires onto a power barrel plug can be challenging, and it's important to have the right equipment, such as a helping hands holder to keep the barrel plug and wire in position.
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| Characteristics | Values |
|---|---|
| Soldering wires onto a power barrel plug | Strip a short patch of wire, solder the centre pin, heat the outer tab, press a pre-tinned wire onto the soldered part, fold the wire back to the clamping flaps and solder, or crimp the flaps |
| Soldering without a hole for the wire | Use a "helping hands" holder with alligator clips to hold the barrel plug and wire in position, coat the plug's contact surfaces with solder, and use flux and a higher wattage unregulated soldering iron |
| Splicing a barrel jack extension cord | Check polarity with a multimeter, twist the wires, measure resistance from each contact, match the connectors, solder the joints and insulate |
| Splicing two different barrel jack sizes | Check the load requirement, use a DVM in continuity mode to check the wires and match them up, ensuring the centre contact connects to the power supply's positive or negative supply as required |
| Barrel connector types | Female barrel connector or "jack" (PCB-mounted, cable mount, or panel mount); male barrel connector or "plug" (usually wire termination, with multiple methods of attaching to the wire) |
| Barrel connector characteristics | Inner diameter (pin diameter inside jack), outer diameter (sleeve diameter outside plug), and polarity (whether sleeve voltage is higher or lower than tip voltage) |
| Polarity | Positive polarity (tip positive, sleeve 0V) is most common |
| Molex connector | Male/female terminology varies; male connector has pins inside, female connector slips inside a plastic shell surrounding male pins |
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What You'll Learn
Splicing a barrel jack extension cord
Step 1: Prepare the Extension Cord
Before you begin splicing, you need to make sure that your extension cord is in good condition and has the correct length. If you need to extend the cord, you can splice two cords together by following the same process as splicing the barrel connector. Ensure that the wires inside the extension cord are colour-coded or use a multimeter to determine the polarity of the wires.
Step 2: Strip the Insulation
Use your teeth or an appropriate tool to carefully strip off the insulation from the ends of the wires you will be joining. Strip about 2 to 3 cm from the end, exposing the copper conductors.
Step 3: Join the Wires
Identify the positive and negative wires, typically indicated by red and black colours, respectively. Match the positive wires from each section and join them by making an "X" and then twisting the wires tightly together. Repeat this process for the negative wires. You can also use solder and flux to join the wires for a stronger connection.
Step 4: Insulate the Joints
Once you have joined the wires, it is important to insulate the joints to prevent short circuits. Use electrical tape to cover the twisted wires, wrapping it tightly around the connection. Then, fold the tape down against the cable and run another layer of tape around the entire splice for added insulation.
Step 5: Use Heat Shrink Tubing (Optional)
If desired, you can use heat shrink tubing to insulate and protect the spliced area. Place the heat shrink tubing over the spliced area and apply heat to shrink it tightly around the joints. This provides insulation and mechanical strain relief.
Step 6: Test the Connection
After splicing the barrel jack extension cord, plug it into the power source and use a device to test the connection. Ensure that the voltage and current are appropriate and that there are no signs of short circuits or damage to the extension cord.
It is important to note that working with electrical components can be dangerous if not done properly. Always take the necessary safety precautions and consider seeking professional assistance if you are unsure about any part of the process.
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Rewiring a barrel connector
Prepare the Connector and Cable
Firstly, you need to prepare the connector and cable. If the new connector is already attached to a cable, ensure that the wires are cut and stripped. It is important to identify the type of connector you are working with. Barrel connectors are typically found on low-cost consumer electronics and come in two varieties: male and female. The male connector, or "plug", usually has a pin in the centre, while the female connector, or "jack", has a sleeve or shell. The gender of the connector is determined by the gender of the pins inside.
Check the Load Requirement
Before proceeding, it is crucial to check the load requirement of the connector. There should be a label indicating whether the connector is centre-positive or centre-negative. This information is essential for ensuring correct wiring.
Use a Multimeter to Check Polarity
To ensure the wires are connected correctly, use a multimeter to check the polarity. Set the multimeter to Ohm range (Ω) and select the smallest range available, typically 200 Ohm. Connect the wires of the extension cord by twisting them together, without soldering yet. Measure the resistance from each contact of the male connector to the corresponding contact of the female connector. If they match, you can proceed to soldering. If not, you will need to swap the wires and re-check.
Soldering the Connector
Soldering the wires to the connector can be challenging. First, coat the plug's contact surfaces with solder. For the centre pin, strip a short patch of the wire and solder it. For the outer tab, heat it until the solder flows, then press the pre-tinned wire onto it. Alternatively, you can fold the wire back to the clamping flaps and solder, but this may not be as reliable. Using a higher-wattage unregulated soldering iron (40W-60W) can help overcome solder flow issues.
Insulating and Finishing
After soldering, ensure that the joints are properly insulated. Use electrical tape to cover the connections, following the techniques suggested by professionals in the field. Finally, slide heat-shrink tubing over the wire splices and heat it evenly with a butane lighter or small torch to conform to the shape of the splice.
By following these steps, you can successfully rewire a barrel connector. However, always exercise caution when working with electrical components, and if in doubt, consult a certified electrician.
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Soldering wires onto a power barrel plug
To begin the process of soldering wires onto a power barrel plug, you will need a "'helping hands' holder with two alligator clips to hold the barrel plug and the wire in position. This will allow you to focus on manipulating the solder wire and the iron. It is important to note that larger parts like plugs have a higher thermal mass, which can cause issues with soldering.
Before bringing in the wires, coat the plug's contact surfaces with solder. If you are having issues with the solder not sticking, you can try fluxing the plug's contact surfaces, using a higher wattage unregulated soldering iron (40W to 60W), or cranking up your regulated iron.
For the centre pin, strip a short patch of one wire and solder it. For the outer tab, heat it until the solder flows over the desired place, then press the pre-tinned wire onto the soldered part and let it merge. Alternatively, you can fold the unsoldered wire back to the clamping flaps and solder it to them. However, the flaps may be too flimsy to provide much mechanical strength.
Another method is to cut the crimp flaps, solder the wire on the flat part, and cover it with heatshrink. This method is commonly used when assembling guitar pedal boards.
If you are new to soldering, it is important to be mindful of the temperature to avoid melting the plastic. Pre-tin your wire-end and the socket separately, then bring them together and heat the junction. You can also trim the wires, twist them, pre-tin them, and use solder paste. Additionally, dipping the wire in flux and tin can improve the bond, especially with copper wires.
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Snipping off barrel connectors
First, use a multimeter with a continuity function to test the polarity of the connector. This will help you identify which wires are positive and negative. For example, on a barrel connector, the left side indicates that the barrel is negative with the inner pin positive, and this is reversed on the right side.
Next, strip off the insulation from the wires. Use your teeth or an appropriate tool to strip off about 2 to 3 cm of insulation from the end of the wire. Be careful not to damage the wires themselves.
Now, you can join the positive wires. Take the positive wires from each section and join them by making an 'X' and then twisting the wires tightly together. Ensure that the connection is secure and soldered if possible. If soldering, use a higher wattage unregulated soldering iron (40W to 60W) to ensure the solder flows properly.
After soldering, cover the joint with electrical tape. Wrap the tape around the twist and then fold it down against the cable, providing extra insulation.
Finally, finish by covering the entire splice with heat shrink tubing. This will provide a secure and long-lasting connection.
While this guide provides general steps, specific procedures may vary depending on the type of cable and connector involved. It is always important to prioritize safety and follow electrical engineering best practices.
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Using a voltmeter to test polarity
Using a voltmeter to test the polarity of a DC barrel connector is a straightforward process, but it is important to exercise caution when working with electrical installations. Before you begin, ensure that the power is turned off and the outlet is disconnected from the wiring.
Firstly, set your voltmeter to the appropriate setting. If you are testing a DC power supply, set the voltmeter to read DC voltage. If you are testing the polarity of a barrel connector, set the voltmeter to Ohms.
Next, you will need to insert the probes of the voltmeter into the correct locations. If you are testing a power supply, insert the red probe (positive) into the end of the power supply plug and the black probe (negative) against the barrel of the plug, being careful not to touch the tip or the red probe. If you are testing the polarity of a barrel connector, insert one probe into the large slot and the other against the screw, scraping off any paint to ensure a good contact.
Once the probes are in place, read the voltage displayed on the voltmeter. If you are testing a power supply, a positive reading indicates correct polarity, while a negative reading indicates that the probes are attached in reverse. If you are testing the polarity of a barrel connector, a lighting voltage detector indicates that the hot and neutral wires are reversed, and the wiring should be checked further.
It is important to note that polarity matters for DC power supplies and connections. If you are working with AC power, polarity may not be a concern, and a universal adapter may be sufficient. However, it is always good practice to test a power supply before use, and a voltmeter can help you determine the correct polarity to prevent damage to your devices.
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Frequently asked questions
Soldering a power barrel plug can be tricky. Firstly, you need a holder like a "helping hands" alligator clip to hold the barrel plug and the wire in position. Even if there is no hole for the centre conductor wire to go through, it can be soldered by simply bringing it into contact with the terminal. Before bringing in the wires, coat the plug's contact surfaces with solder. If the solder is not sticking, try fluxing the plug's contact surfaces liberally and using a higher wattage unregulated soldering iron.
If the wires are colour-coded, this is a simple process. If not, set your multimeter to Ohm range and select the smallest range available. Connect the wires of the extension cord first by twisting them, then measure from both ends. Each connector has two contacts: one inner and one outer. Measure resistance from each contact of the male connector to the corresponding contact of the female connector. If they match, you can continue soldering the joints. If not, open the twisted connection and swap the wires.
The female connector, or "jack", is usually found on the end of a cable and slips inside a plastic shell that surrounds the male pins on the male connector. The male connector, or "plug", is usually only found in a wire termination variety, although there are multiple methods of attaching the plug to the end of a wire.
