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Multi-Way Conventional loudspeakers with crossovers

Broken wire on a coil, any way to fix it ?
Broken wire on a coil, any way to fix it ?
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Old 19th March 2019, 09:02 PM   #11
Moondog55 is offline Moondog55  Australia
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Voice coil wire or the tinsel leads?
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Old 19th March 2019, 09:12 PM   #12
Galu is offline Galu  Scotland
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Did you miss the photos Moondog?
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Old 19th March 2019, 09:34 PM   #13
turk 182 is offline turk 182  Canada
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could the OP highlight where the break is in the photo?

the only thing i can detect visually at this magnification is what appears to be an oval ring suggesting a cracked solder joint where the tinsel lead comes through the voil coil former to the foil pad.
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Old 19th March 2019, 10:07 PM   #14
Moondog55 is offline Moondog55  Australia
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Quote:
Originally Posted by Galu View Post
Did you miss the photos Moondog?
No I just cannot see a break in the VC wiring so I echo what turk 182 said. Could be my eyes or an unclear photo tho
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Old 19th March 2019, 10:37 PM   #15
Galu is offline Galu  Scotland
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Sorry if I'm getting it wrong Moondog, but it appears to me that the OP has been attempting to solder where the voice coil wire is crossing over to the upper, rectangular solder pad.

I am seeing a lumpy, uneven solder residue there and some melted 'wax'. Hope the OP will clarify soon.
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Old 19th March 2019, 10:50 PM   #16
turk 182 is offline turk 182  Canada
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i looked at it again on a larger higher rez monitor and the bottom pad has an oval approaching the edges of the square pad, the upper one i see an oval that is much smaller in diameter.
are the tinsel leads on the topside of the cone or is that what's up with the double row of silicone globs on the spider is that where the tinsel leads where attached?

was continuity checked with a meter? being a car audio sub with long excursion all soldering must not create a raised point or build up that could wind up getting caught in the gap.

Last edited by turk 182; 19th March 2019 at 11:07 PM.
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Old 20th March 2019, 12:07 AM   #17
FE3T is offline FE3T  Norway
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Its possible that the voice coil wire are aluminum, a material I have no real success of soldering with good results.
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Old 20th March 2019, 12:12 AM   #18
dadafu is offline dadafu
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Old 20th March 2019, 09:46 AM   #19
turk 182 is offline turk 182  Canada
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ok so Galu was right scrap away the insulating material and use a thin strand of copper wire to bridge the break.
have you confirmed continuity of the voice coil?
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Old 20th March 2019, 09:52 AM   #20
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Not keen on the darkened colour of the voice coil in the centre. Been over driven and overheated, I would say. May have shorted turns within the darkened area; post 8, 1st photo.
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