Autocom, a couple of questions pls?

[Fanum]

I've just been fitting headsest to helmets so I can wire an autocom pro 7 sport (7 pin) that i bought a long time ago.

I've got a box of bits and although I thinhk I've sorted most of it out, have got the two helmet sets working and talking to eachother, I'm puzzled about a couple of bits so here goes.....

I've got two parts that are very similar;

Both have twin 3.5 mm jack sockets on one end and a 6 inch (approx) fly lead ending in a stereo (3 pole) 3.5 mm jack plug on the other end

The lettering on the top indicates 'C' as the fly-lead end, and 'A' and 'B' for the sockets on the other end.

One though has a black base section, and the other is all red

Are these the same part? (would seem odd, as they both came in this second hand kit)

I believe the all-red one is a dual audio stereo isolator, so I can plug in two audio sources/an audio source and a 'phone, although I have seen something that looks identical described as a Garmin Zumo isolator...or is that the same

So the two questions on those two parts are...are they the same, and if not, what are they?

Secondly, I've got two rubber shrink wrapped PCB inline devices.....one has an 18 inch (appr) fly lead ending in a stereo 3.5 mm jack plug on one end, and a MONO 3.5mm jack plug on the 3 foot flying lead on the other end.......the shrink wrapped PCB is about 3 inches long all in.

The second unidentified shrink is mine and is from my old kit, is the same length, has a 3.5 mm stereo plug on a 6 inch fly lead one end and a PAIR of 3.5 mm jack sockets on the other.....I'm pretty sure this came with the newer second hand kit I bought, but if (as I suspect) it's the same but an older version of the red isoltor unit, I dont quite understand why he had 2 or 3 of them

If anyone can help identify these bits properly it'd be appreciated
( I can take pics if necessary, but hopefully the above should give enough info?)


And I do wish Autocom would put their part numbers on their kit, so we lesser mortals can work out what we've got

 

[John Armstrong]

I'd guess the heatshrink wrapped pcb type thing with a single connectors is a 2610 etc isolator, so you hear only the words and not any interference.

As for the 2 boxes I think one is a pre zumo multi outlet isolator, a later version of the above. And it looks very similar but is different, though I don't know if there's any difference in how it operates

 

[Bryn]

I know I've got the red and black box plugged into the autocom box, but not sure what its for... when I remove it though there's interference I can hear, plug it back in and its gone

 

[Fanum]

I know I've got the red and black box plugged into the autocom box, but not sure what its for... when I remove it though there's interference I can hear, plug it back in and its gone

That's going to be my approach Bryn....I'll connect it all up, stick some music on and go for a spin with a pocketful of bits, stop, keep plugging them in in different sequences/sockets and see what works best

I had a quest wired to my old setup, so i think the older of the heatshrink wrapped PCBs with the stereo output/mono input is the doodah from that....ive still got a 2.5mm to 3.5 mm adaptor araldited to the old quest cradle and I know the quest output is mono, so i'm 99% confident on that one now ive thought a little further

 

[Dave Ett]

The all red unit is definitely the ground loop isolator. It allows you to run various things from the bike power supply without them causing horrible interfereance on the audio lines. There is a good technical description of why this happens on Autocoms website (I think).

 

[beemerboy9]

The black part of the black/red combo is non-isolated - for a battery powered MP3 device.

 

[Mick_rw]

Here is a breakdown.....

of the componenets showing yours and a description....

Autocom...

 

[Fanum]

The all red unit is definitely the ground loop isolator. It allows you to run various things from the bike power supply without them causing horrible interfereance on the audio lines. There is a good technical description of why this happens on Autocoms website (I think).

The black part of the black/red combo is non-isolated - for a battery powered MP3 device.

Thank you, that makes sense now.....

of the componenets showing yours and a description....

Autocom...

Thanks Mick...I did find that sheet, which is where I got the reference to the 'zumo' that I had in the OP.....the problem was still that I couldn't see the difference between the all-red and red/back version, which has been clarified by BB9 above with the 'Bill-proof' descriprion of one being for self-powered devices and the other for bike-powered devices

It would still help a lot of Autocom would put part numbers on their kit