Cable Build Guide
Cable Build Guide
Complete connection layout

How everything hooks up together

Use either cable option in the same overall setup. Only the 3.5 mm plug construction changes; the device, UGREEN DAC adapter, red and black leads and crocodile clips are used in the same sequence.

Complete GeoVue cable setup with tablet, UGREEN USB-C audio adapter, four-pole plug, red and black cable and crocodile clips
Complete equipment layout: device, UGREEN DAC adapter, 3.5 mm four-pole plug, red and black leads and matching crocodile clips.
1

Phone or tablet

Open GeoVue on the recording device and connect through its USB-C port.

2

UGREEN DAC adapter

Plug the UGREEN USB-C adapter into the device. Confirm that the adapter contains a DAC chip.

3

Choose either plug

Insert the completed hard-wired TRRS plug or the green screw-terminal TRRS plug into the UGREEN adapter.

4

Red and black leads

Run the 1.5 m red and black silicone leads from the selected plug to the matching clips.

5

Crocodile clips

Attach the red and black clips to the two field electrodes or ground pins, following the GeoVue field procedure.

Before recording: confirm the clips are secure, separated from each other and connected to the correct red and black leads. Run both cable tests above before field use.
Assembly and testing instructions

Two reliable ways to build the cable pack

Choose between a compact direct-soldered cable and a simpler screw-terminal build. Both options use the UGREEN USB-C audio adapter with a DAC chip.

Option 1: Hard-wired Option 2: Screw-in
Cable build equipment arranged with a tablet, UGREEN adapter, screw-terminal plug, cable rolls and crocodile clips
Typical equipment for the cable pack. Buy quality components and keep spares.
1

Direct wiring and soldering

The red and black cables are soldered directly into a 3.5 mm four-pole TRRS plug. This is the compact option, but it is difficult and requires careful soldering.

Advanced buildDirect solderingCompact
2

Screw-in four-pole plug

The red and black cables are secured in a green screw-terminal TRRS plug. This avoids soldering inside the plug and is easier to assemble, inspect and repair.

Easier buildServiceableRecommended alternative
Option 1

Hard-wired cable with the UGREEN adapter

Start with the original direct-soldered design. The cable is wired into a 3.5 mm four-pole plug, then connected to the UGREEN USB-C to female 3.5 mm audio adapter.

Buy the UGREEN adapter

Use a UGREEN TRRS USB-C to female 3.5 mm audio adapter. Confirm that the model includes a DAC chip and supports 24-bit/96 kHz audio.

Find the UGREEN DAC adapter on eBayUSB-C to female 3.5 mm, 24-bit/96 kHz
This option is not easy.Directly soldering the small TRRS plug requires good tools, a steady hand and careful strain relief. Use the screw-in option below when easier assembly is needed.
UGREEN USB-C to female 3.5 millimetre audio adapter
UGREEN USB-C to female 3.5 mm adapter. Check that the chosen model contains the DAC chip.
Direct-soldered cable wiring diagram showing black and red leads connected to the lower two contacts of a four-pole TRRS plug
Direct wiring layout. The upper two TRRS contacts are left unconnected. Follow the supplied terminal positions exactly.

Hard-wired build requirements

  • Use 1.5 metres of black 1 mm silicone cable.
  • Use 1.5 metres of red 1 mm silicone cable.
  • Fit strain relief at the plug and at each clip.
  • Use lightweight crocodile clips approximately 10 cm long with a jaw opening of about 3 cm.
  • Leave the two upper TRRS contacts unconnected.
  • Connect the black and red leads only to the positions shown in the wiring diagram.
Red and black 1.5 metre cables with crocodile clips and bare wire ends for soldering
Cable-to-clip assembly: 1.5 m red and black silicone leads soldered to matching crocodile clips.
Option 2

Screw-in four-pole plug

This option replaces the difficult soldered plug with a terminal-block TRRS connector. The cable ends are inserted into the correct terminals and tightened with the screws.

Buy the green four-pole screw plug

Use the specified green terminal-block 3.5 mm four-pole plug or an equivalent model with clearly marked L, R, V and ground terminals.

SHANFEILU 3.5 mm audio terminal plugGreen four-pole screw-terminal connector on Amazon
L
No connection
R
No connection
V
Black lead
⏚
Red lead
Why this option is easierThe connector can be opened, checked and rewired without soldering inside the plug. It is the preferred alternative when the hard-wired build is impractical.

Screw-in cable build

  1. Prepare 1.5 m red and black silicone leads.
  2. Attach the matching crocodile clips and fit strain relief.
  3. Open the green screw-terminal plug.
  4. Leave L and R unconnected.
  5. Secure the black lead in V.
  6. Secure the red lead in the ground terminal.
  7. Check for loose strands, tighten the screws and close the plug body.
Close-up of the green screw-terminal four-pole plug showing no connection at L and R, black lead at V and red lead at ground
Example of the screw-in jack. L and R remain unused; the black lead goes to V and the red lead goes to ground.
Recommendations

Build for reliability

Small components are easily damaged or misplaced. Good preparation reduces downtime in the field.

Buy spares

Buy two of each important item. Equipment can be broken or lost, so keep a ready-to-use spare.

Choose quality parts

Use good-quality cable, clips, strain relief and connectors that match the specifications shown above.

Verify the adapter

Make sure the UGREEN adapter contains a DAC chip. A passive USB-C adapter may not work correctly.

Final checks

Test every completed cable

Run both checks before the cable pack is used. Keep the crocodile clips separated during testing.

1

Voice recorder test

  1. Connect the cable pack to your phone.
  2. Open the phone's onboard voice recorder.
  3. Make sure the clips are not touching.
  4. Press record and say a few words.
  5. Stop recording and replay the file.
Incorrect wiring: If sound waves appear on the screen, or you can hear your voice on playback, the wiring is not correct.
2

Bluetooth cancellation test

  1. Play music from the device through a Bluetooth speaker.
  2. While the music is playing, plug in the completed cable.
  3. Observe what happens to the Bluetooth speaker.
Expected result: Plugging in the cable should cancel playback through the Bluetooth speaker.

Both checks passed?

The cable pack is ready to go when the voice recorder does not capture your speech and inserting the cable cancels Bluetooth speaker playback.

GeoVue cable build guide. All supplied images are embedded directly in this self-contained HTML file.