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PostPosted: Thu Oct 18, 2018 9:14 pm 
Gold Trader
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Joined: Sat Oct 23, 2010 10:33 pm
Posts: 2443
Location: New Forest
Asking for help, as always :(

The story is that one of the speaker crossovers in my car went kaput. I know the problem, I can solder, but need to know if I can buy the parts, and what the hell I'd search for if I can.

The bottom left capacitor (?) needs replacing (if you move it with your finger it cuts in and out, and the solder joints are 100%)

The right hand large coil of wire also needs replacing; one of the legs that you solder through the PCB has snapped off, but right up against the coil.

Any suggestions?

Much love.

Attachment:
focal crossover.JPG
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PostPosted: Thu Oct 18, 2018 11:21 pm 
Retro Guru

Joined: Tue May 11, 2010 6:39 pm
Posts: 563
Location: North London
The capacitor will be easy to replace, the coil (inductor) less so as it probably won't have a value marked on it. If you can get a circuit diagram from Focal you would be able to order a replacement easy enough. Falcon acoustics are the go to place for crossover components - they wind their own inductors, very high quality stuff, and also a good source of advice in my experience.

Failing that you might be able to unwind a bit of the fresh wire, clean it up and resolder it - it would be close enough in value I would have thought. Or measure the inductance of the good coil in the other crossover to get a replacement. Inductance meters can be had fairly cheap these days.


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PostPosted: Fri Oct 19, 2018 9:37 am 
Gold Trader
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Joined: Sat Oct 23, 2010 10:33 pm
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Location: New Forest
hmm.. I like what your'e saying, but looking at 'cheap inductance meter' it may be cheaper to source a new complete crossover...?

:(

I think unwinding it may not be a starter as it's broken from the middle most wire, and would require re-spooling the whole thing .

Would it be possible to buy the wire and re-spool?


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PostPosted: Fri Oct 19, 2018 4:06 pm 
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Joined: Sun Mar 14, 2010 2:33 am
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Location: daaan saaaf
Electronics components should have the values marked on them. Capacitors will have a voltage, for example 100V, and a capacitance in Farads, e.g. 33uF - 33 micro farads, some types of capacitors also have a polarity: https://en.wikipedia.org/wiki/Electrolytic_capacitor

The coil things are inductors and they have a value in measured in henrys, so 20mH is 20 mega henrys: https://en.wikipedia.org/wiki/Inductor

You should be able to find replacement parts of equivalent type and value and possible the same package type/footprint; some parts may have the same value, but are available in several package types/sizes to fit different circuit board hole spacings.

Try these suppliers:

https://www.falconacoustics.co.uk/
https://willys-hifi.com/collections
https://www.hificollective.co.uk/componentshome.html


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PostPosted: Fri Oct 19, 2018 4:32 pm 
Gold Trader
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Joined: Sat Oct 23, 2010 10:33 pm
Posts: 2443
Location: New Forest
Thanks guys, much appreciated.

As it turns out, it's £20 to get a replacement, so I'm going down that route - I've had a few problems with this particular crossover, including dry solder joints, so think I may be better off just getting a replacement.

But I've learnt a few things, thanks all!


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