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Van MP3 Shielded Cable Unnecessary?

post #1 of 4
Thread Starter 
Hi,

I am in process of a newer Van Conversion for camping.

The Van Conversion Shop Owner wants to close up the walls very soon but my order of cables and parts was mangled and delayed from Ohio to Silicon Valley. My choice for one cable I now believe was perhaps unsound.

I need to get a cable very quickly locally.

I have a MP3 player "Trio MP3-DA-8033A-1GB" Earphone max power (L) 10mW (R) 10mW (32 Ohm).

I wish to feed the output of the Trio into the Van's Radio using a cassette "Sony car connecting Pack CPA-7" adapter which works great using the attached 4 foot cable.

The cable I need to run from the very rear of my van to the radio at the front needs to be > 15 ft < 25 ft. I had ordered a 25 ft Shielded Stereo cable with RCA plugs that may be cut off as needed for 3.5 plug / jack connections, this cable is now arriving too late.

When the Trio will be in use the Van Engine will not be running and I will be in a sleeping bag at the rear of my newer Van. The Van's radio can be turned on and off by a switch there and the Trio controlled for song selection just before going to sleep.

I have a four conductor unshielded, untwisted conductor cable in place with one conductor used to power the Van's radio from the Camping (Second) battery.

Three conductors are available and I have plenty more of this cable available.

With the low impedance (32 Ohm) output do I need to run a Shielded Cable for this application? Cost is not a problem for 25 ft of cable as the project is 50% under budget and with the Van Conversion Shop Owner pushing 500% ahead of schedule.

A Fluorescent light, a Laptop computer with 110 Volt Power Inverter, a fan, a scanner and a refrigerator are possible sources of noise.

TIA for your advise.

Stephen H. Fischer
post #2 of 4
Quote:


With the low impedance (32 Ohm) output do I need to run a Shielded Cable for this application?

The spec refers to the impedance of the headphones, not the output.
It's difficult to induce noise in a low impedance circut, a high impedance circuit is much more susceptible.
Use sheilded cable, such as any coax.
post #3 of 4
Quote:
Originally Posted by SFischer1 View Post

Hi,

I am in process of a newer Van Conversion for camping.

The Van Conversion Shop Owner wants to close up the walls very soon but my order of cables and parts was mangled and delayed from Ohio to Silicon Valley. My choice for one cable I now believe was perhaps unsound.

I need to get a cable very quickly locally.

I have a MP3 player "Trio MP3-DA-8033A-1GB" Earphone max power (L) 10mW (R) 10mW (32 Ohm).

I wish to feed the output of the Trio into the Van's Radio using a cassette "Sony car connecting Pack CPA-7" adapter which works great using the attached 4 foot cable.

The cable I need to run from the very rear of my van to the radio at the front needs to be > 15 ft < 25 ft. I had ordered a 25 ft Shielded Stereo cable with RCA plugs that may be cut off as needed for 3.5 plug / jack connections, this cable is now arriving too late.

When the Trio will be in use the Van Engine will not be running and I will be in a sleeping bag at the rear of my newer Van. The Van's radio can be turned on and off by a switch there and the Trio controlled for song selection just before going to sleep.

I have a four conductor unshielded, untwisted conductor cable in place with one conductor used to power the Van's radio from the Camping (Second) battery.

Three conductors are available and I have plenty more of this cable available.

With the low impedance (32 Ohm) output do I need to run a Shielded Cable for this application? Cost is not a problem for 25 ft of cable as the project is 50% under budget and with the Van Conversion Shop Owner pushing 500% ahead of schedule.

A Fluorescent light, a Laptop computer with 110 Volt Power Inverter, a fan, a scanner and a refrigerator are possible sources of noise.

TIA for your advise.

Stephen H. Fischer

Maybe you should venture down to your local Radio Shack to see what they have on-hand.
post #4 of 4
Thread Starter 
Quote:
Originally Posted by whoaru99 View Post

Maybe you should venture down to your local Radio Shack to see what they have on-hand.

Hi,

Nope!!!

I did look at that type of cable but I rejected it because the connectors do not meet my needs.

RS as you suggest is not possible anyway because none of the cables on the page you sent me to are long enough.

I need 25+ feet.

25 ft Stereo 3.5mm Extension Cables

One end Connector:

Keystone Mount 3.5mm Connector

I have many of the connectors for the other end in my parts bin.

I went with the Stereo cable with RCA connectors as I have adapters for testing before putting the cable into the walls. The connectors will be cut off Later.

25 Ft SLV Series Stereo Audio Cables

If the UPS package arrives Monday it will be JIT as other work was done first.

----------------------------------

Radio Shack has over the years done a huge number of repeated things to drive me away and I do not consider them a source of anything at all that I want or need any more.

Stephen H. Fischer
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