Discussion Overview
The discussion revolves around the construction of a custom cable featuring a 7-pin Amphenol connector and a unique electrode input. Participants explore the feasibility of sourcing components, the appropriate wiring techniques, and considerations for signal integrity in the context of biomedical applications.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- The original poster (OP) seeks information on sourcing a specific white electrode input socket and inquires about the feasibility of constructing a cable instead of purchasing a $200 pre-made one.
- Some participants suggest using twisted wires similar to those in Ethernet cables and propose shielding the wires within a grounded screen to minimize noise.
- There is a discussion about wire size, with one participant noting that it depends on the unspecified signal amps and voltage, which affects insulation requirements.
- Concerns are raised about how cable length might introduce noise, with one participant indicating that a screened twisted pair should be reasonably quiet at 1 kHz.
- One participant calculates the wavelength of a 1 kHz signal and suggests that impedance mismatches should not be problematic due to the short length of the cable compared to the wavelength.
- The OP mentions the use of 1.5mm touchproof sockets and specifies that the voltage relates to biopotentials of human skin surface, questioning if Ethernet cable is suitable for this application.
- Another participant questions the high cost of the pre-made cable, prompting a discussion about its features and intended use.
Areas of Agreement / Disagreement
Participants express varying opinions on the best practices for cable construction, including wire type and shielding methods. There is no consensus on the sourcing of the electrode input or the specific requirements for the cable, leaving the discussion unresolved.
Contextual Notes
Participants have not specified the exact electrical characteristics required for the cable, such as signal amplitude or environmental noise levels, which could influence their recommendations. The discussion also lacks detailed specifications for the electrode input socket.