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Old 1st January 2007, 05:30 PM   #1
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Default crossover conductivity problem

Hi all,

This is my first crossover and I'm having problems with the low pass.

I'm trying to build a second order Linkwitz Riley filter like this one(similar but crossover point at 2200Hz):
Click the image to open in full size.

I bought this PCB from Solen:
Click the image to open in full size.

This is the specs of inductors I'm using:
http://www.solen.ca/induct/litz.htm

The high pass is fonctionnal but not the low pass. From the tests I did, it's like the inductors are not conducting current. To affirm this, I connected my driver directly to the amp with the inductor in serie in the circuit and I had no sound, like it's not conducting ... I also tested it with a volmeter and I'm reading 0.310V before the inductor and 0.030V after ... That would explain why the current stop at the first inductor in the low pass using the PCB and the complete crossover network.

Also, can someone explain me why in the PCB(low pass) Re and Ce are inverted according to the design ?

Thanks a lot, I'm really stuck right now

REALFLEO
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Old 1st January 2007, 06:13 PM   #2
tinitus is offline tinitus  Europe
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You say you tested..." ......with the inductor in the curcuit"

Does that mean its mounted on the printboard

Have you tried it directly connected without printboard
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Old 1st January 2007, 06:59 PM   #3
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It's what I meant by tested with the inductor in serie, directly connected to the amp(no PCB).

and I heard no sound... that's why I'm thinking the inductor is not conductive.

Thanks,

REALFLEO
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Old 1st January 2007, 08:11 PM   #4
Chartal is offline Chartal  Canada
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Maybe there is varnish at the lead end that you have to remove?
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Old 1st January 2007, 08:58 PM   #5
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I thought about it too but what should I do ... use sandpaper to remove that varnish on leads ...

Thanks,

REALFLEO
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Old 1st January 2007, 09:01 PM   #6
tinitus is offline tinitus  Europe
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Try measure coil impedanse
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Old 1st January 2007, 09:46 PM   #7
v-bro is offline v-bro  Netherlands
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Happy new year to you too Realfleo!

Also very good choice of components!
Strange problem you have with these litz coils, I used them before and was very pleased with the sound, improves the exactness of the low freqs. very dramatically. To test it just heat the leads well with a solder iron or jet burner and add solder with flux in the meanwhile...it takes a while for the varnish to burn off...(it'll start to 'bubble' first creating a distinct smell )...if you use a solder iron try to find the 'sweet spot' of the heat transfer well, mostly it works well to start heating at the tip of the lead (where it has been cut off) because it doesn't have varnish there it will take up solder quite easily and there you have a good 'heat bridge'....

Take your ohms-meter and it should read about 0.3 ohms (very low resistance on these coils!)....
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Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......
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Old 2nd January 2007, 04:40 AM   #8
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ok so do you think I had this ''conductivity'' problem cuz of the varnish on coils ?

It's really like no current can go through the inductor for the low pass ...

I'll test burning the varnish tomorrow because it's almost 1am here ;-)

Thanks for your post,

REALFLEO
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Old 2nd January 2007, 02:13 PM   #9
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Default Be very careful!!!!

The tweet section will seem to be working even if it's inductor is not connected. Check to make sure the tweet L is actually in the circuit, or you may blow the tweeter.

Cheers, John
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Old 2nd January 2007, 03:38 PM   #10
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You are right.

I don't know if the inductors are working but I'm sure the L-Pad is cuz I tested the HP circuit with different freq. and I was able to hear the drop-off.

Thanks,

REALFLEO
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