Creating a Custom Cable: 7-Pin Amphenol Connector and Unique Electrode Input

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In summary, the article discusses the process of creating a custom cable using a 7-pin Amphenol connector and a unique electrode input. It details the steps required for assembly, including selecting appropriate materials, wiring configurations, and ensuring proper connection integrity. The guide emphasizes the importance of precision and testing during the assembly process to ensure functionality and reliability of the custom cable for specific applications.
  • #1
Ephant
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electrode input cable.jpg


This cable costs $200 so I want to build one. I know where to get the round silver plug at right which is a 7 pin Amphenol and I know the pin designations inside.

I'd like to know if the left white electrode input socket can be found anywhere or it can only be made special at factory. Have you seen anything like it being sold anywhere?

The red (+) and black (-) input is differential with a ground/reference at middle. Should I use twisted wires like used in ethernet cable as the cable? What is the size of wire I should use. How many feet before it can cause enough noises?

I plan to use up to 1000 Hz signal. If the wire and plugs at either end is not matched. Would the impedance mismatched attenuate or cause noises in the signal?

Thanks!
 
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  • #2
Ephant said:
Have you seen anything like it being sold anywhere?
What are the physical dimensions of the shell and the electrodes?
Ephant said:
The red (+) and black (-) input is differential with a ground/reference at middle. Should I use twisted wires like used in ethernet cable as the cable?
Twist the (+) and (-) wires, and shield them inside the grounded screen.
Ephant said:
What is the size of wire I should use.
That depends on the unspecified signal amps, the voltage determines the insulation.
The wire should fit in the shell, and terminate sensibly at the electrodes.
Ephant said:
How many feet before it can cause enough noises?
Many. At 1 kHz, a screened twisted pair will be reasonably quiet. How much noise do you need to avoid, and in what environment?
Ephant said:
I plan to use up to 1000 Hz signal. If the wire and plugs at either end is not matched. Would the impedance mismatched attenuate or cause noises in the signal?
The wavelength of a 1 kHz signal would be 3e8/1e3 = 3e5 = 300 km. The cable is very much shorter than that, so there should be no problems at 1 kHz.
Only the total lump capacitance of the cable would be important.
 
  • #3
It's 1.5mm Touchproof sockets. Voltage is biopotentials of human skin surface. So I can just use ethernet cable?
 
  • #4
Why do you suppose it costs $200? What-all does it do? What does it plug into?
 
  • #5
Thread is closed for Moderation...
 
  • #6
Because this appears to be related to the OP's DIY Biomedical experimentation, the thread will remain closed.
 

FAQ: Creating a Custom Cable: 7-Pin Amphenol Connector and Unique Electrode Input

What are the key specifications of a 7-pin Amphenol connector?

The 7-pin Amphenol connector typically features a circular design with seven pins arranged in a specific pattern. It is known for its durability, resistance to environmental factors, and reliable electrical connections. Key specifications include the pin configuration, current and voltage ratings, and the type of materials used for insulation and contact points.

How do I determine the correct pin configuration for my custom cable?

Determining the correct pin configuration involves consulting the datasheets of the devices you are connecting. Each pin must be mapped according to the function it serves, such as power, ground, signal input, or signal output. Proper documentation and testing are crucial to ensure that each pin is correctly assigned to its corresponding function.

What tools and materials are needed to create a custom cable with a 7-pin Amphenol connector?

To create a custom cable, you will need the 7-pin Amphenol connector, a compatible cable, a soldering iron, solder, wire strippers, and possibly heat shrink tubing for insulation. Additionally, a multimeter can be helpful for testing continuity and verifying connections. It's important to use high-quality materials to ensure the durability and performance of the custom cable.

How do I ensure a secure and reliable connection for the unique electrode input?

To ensure a secure and reliable connection, you must carefully solder the wires to the correct pins according to the electrode input specifications. Use heat shrink tubing or other insulation methods to protect the connections from short-circuiting. Additionally, perform thorough testing with a multimeter to confirm that all connections are stable and functioning correctly.

What are the common troubleshooting steps if the custom cable does not work as expected?

If the custom cable does not work as expected, start by checking each connection with a multimeter to ensure continuity. Verify that each pin is correctly mapped according to the device's requirements. Inspect the solder joints for any cold solder joints or shorts. Ensure that the cable and connector are free from physical damage. If issues persist, consult the device's documentation for further troubleshooting steps and consider redoing any suspect connections.

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