crossover conductivity problem

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REALFLEO

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Joined 2006
#1
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):
An externally hosted image should be here but it was not working when we last tested it.


I bought this PCB from Solen:
An externally hosted image should be here but it was not working when we last tested it.


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
 
#7
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!)....
 
#8
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
 
#11
HEY !!!! Good news guys ! You were right v-bro the problem was with that varnish on wires ! 😀

But now I'm wondering how to remove the varnish from bigger coils that are made of multiple wires.

It doen't work with my solder iron. Maybe because it's a 15Watt should I buy a 25 watt ?

Thanks,

REALFLEO
 
#14
I overlooked in the beginning that it was litz wire inductors

Its clear by now that its not well suited fore beginners

Even if it seeems like working ok, it could easily lead to malfunktion if only some of the wires have proper connection 😡
 
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