How to Build an ATS GeoSuite Cable
An ATS GeoSuite cable has been designed to be very simple to construct. Only off the shelf components are required to build the cable that should be accessible at any electrons store.
You will need the following parts to construct a cable :
- An off-the-shelf 2 core plus shield audio cable. This cable should be at least 1.5 meters long.
- An off-the-shelf, 1.5m long length of 0.5mm single core insulted wire. Preferably black in color.
- A 100k Ohm 0.5% resistor. The resistor must be as close to 100K Ohm as possible.
- A 2k Ohm 0.5% resistor. The resistor must be as close to 2K Ohm as possible.
- A large red crocodile clamp. This should be large enough to fit over a nine inch nail head.
- A large black crocodile clamp. This should be large enough to fit over a nine inch nail head.
- Some heat shrinkable insulation. A suitable size to slide over both the resistor and cable is required.
- A soldering iron
- Some solder
The resistor color codes are shown below. They usually are blue in color to indicate a 1% tolerance rating.
It is very important to note that when choosing the resistors they must be within 0.1% of the stated ohm value at a temperature of 25 degrees Celsius. This means the 2K Ohm resistor must have a value of 2000 Ohm +- 2 Ohm and the 100K Ohm resistor must have a value of 100000 Ohm +- 100 Ohm. The closer the resistors ohm value is to the stated value, the better.
The clamps used are readily available off-the-shelf items. They usually come in black and red pairs.
Build the cable using the following wiring diagram as a guide.
Building the Cable
All the materials needed to construct the cable are shown below.
The picture below shows the 2 core cable with red and white core wires and a shield wire. The single core black wire, used for the GND electrode, is a 0.5mm copper core with black insulation.
Start by cutting the resistor leads and the 2 core cable leads as shown below. Apply a small amount of solder to the ends of the cut leads and wires. The shield wire must be cut back to the insulation sleeve.
Now join the 100K Ohm resistor to the red lead and the 2K Ohm resistor to the white lead by soldering the resistors to the cables, as shown below.
Now slide the thin heat shrink sleeves over the resistors as shown below.
Apply heat to the heat shrink sleeves to insulate the resistors, as shown below.
Now connect the opposite side leads of the two resistors to each other and solder them together, as shown below.
Use a thicker heat shrink insulator to cover the cable and two resistors as shown below. This will provide support to the cable at the clamp to improve the cables endurance.
Slid the cable end into the the provided hole in the clamp as shown below.
Ensure that both resistors are positioned within the clamp above the crimp point.
Now securely crimp the resistors into the clamp as shown.
Finally, solder the cable to the clamp as shown.
Slide the red clamp cover over the clamp.
On the black single core wire, remove some of the insulation and apply some solder to the copper wire.
Insert the wire into the provided clamp hole as shown.
Solder the cable to the clamp as shown.
Crimp the cable into the clamp and cover the clamp with a black sleeve as shown.
Attach the black cable to the four pole audio connector as shown. The red cable should be attached to the tip of the four pole audio connector and the white lead should be connected to the four pole audio connector sleeve. For details follow the wiring diagram provided. The shield cable may also be connected to the same four pole sleeve as the black (GND) cable, however, this is not absolutely required. If not connected, then the shield wire should be cut back.
Once connected, clamp all the wires to the audio connector using its crimp point.
Slide the audio connector sleeve over the cables as shown.
The completed cable should look something like this.