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Old 26th December 2012, 05:08 PM   #1571
Vostro is offline Vostro  South Africa
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So all the typing I did was unnecessary hehe.
Im no expert on this small details, so Ill only comment once, and leave it to the experts.

Even in the IPS which is voltage fed, there is noise introduced by the degredation resistors.

Pros and Cons.
I follow convention. But Debates will always be there.

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Old 26th December 2012, 07:57 PM   #1572
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Default So.... people found difference in sonics because of coil

winding direction?

This sounds crazy.....but.... thinking a little bit more, this may change the interaction with metalic surrounding parts.

Interesting stuff.

Will try it.

regards,

Carlos
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Old 26th December 2012, 09:23 PM   #1573
BMW850 is offline BMW850  Netherlands
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Hi Carlos,

Maybe it is the coil too close to the small heatsink.
I do not know, have no explanation for.

Regards,
Rudy
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Old 26th December 2012, 10:02 PM   #1574
bonfis is offline bonfis  United States
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Originally Posted by BMW850 View Post
Hi Carlos,

Maybe it is the coil too close to the small heatsink.
I do not know, have no explanation for.

Regards,
Rudy
I think all of the surrounding metallic parts are aluminum and therefore should not interact with the coils magnetic field. In any case it doesn't explain why the winding direction of the coil would matter.
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Old 27th December 2012, 02:45 AM   #1575
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I like my Hx so much! It's powerful, precise and punchy. It's my passtime to discover all of its subtelties and to learn on a real big fat amp how stuff works... That's why I decorticate it so much and I put it to the test so much, both sonically and on my test bench as well.

I think I've found what'S causing the dent on the downward slope that occurrs on my test bench. It seems to be caused by the VAS bootstrap. In the simulator, If I only put a CCS, the dent doesn't appear. If I put a bootstrap only, the dent is present. That dent is there while using the initial CCS/bootstrap configuration. For all the tests in simulation, I arrange to have the exact same 16mA at the VAS emittor, and to have 54mV bias.

"curious" Mart...

Last edited by canonnica; 27th December 2012 at 02:55 AM.
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Old 27th December 2012, 07:25 AM   #1576
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Originally Posted by destroyer X View Post
winding direction?

This sounds crazy.....but.... thinking a little bit more, this may change the interaction with metalic surrounding parts.

Interesting stuff.

Will try it.

regards,

Carlos
Can't explaine it myself but there is sound improvement and so it has to be noticeable on a scoop no?Sound improvement is only there if your winding direction is (wrong) maybe due fase shift?

Last edited by meanman1964; 27th December 2012 at 07:27 AM.
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Old 27th December 2012, 09:43 AM   #1577
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Default Maybe..... these things are tricky...we must see that

well...we must listen...if you say this way it must be true.

regards,

Carlos
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Old 27th December 2012, 09:58 AM   #1578
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Carlos,
I can test it and let you know.I'd checked my Blame ST and saw that I've wind my coils of both boards differently.This would be a good test to know.
I'm happy I could help Rudy to improve the sound.

Last edited by meanman1964; 27th December 2012 at 10:00 AM.
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Old 27th December 2012, 11:07 AM   #1579
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Default Well Meanman, i have to say i trust on you

And this gonna be a great helping hand if you do that.

regards,

Carlos
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Old 27th December 2012, 11:09 AM   #1580
AndrewT is offline AndrewT  Scotland
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Default coil winding direction

Not interaction with non-ferrous surroundings.

The other circuits may have a "directionallity".
If the on board coil "adds" the same directionallity then you get increased antenna/aerial effect when current values change.
If the on board coil "subtracts" from the on board circuit aerials/antennae then you may get less of feedback effect.

It is better to remove the coil from the board and instead insert it in the cable route leading to the speaker terminals.

I have been telling you this for years. Won't you listen?

Now back to the "The other circuits may have a "directionallity"."
After having located the coil OFF board, go back and design the PCB layout to minimise the feedback effects of the trace directionality.
One way to avoid this trace directionality is to ensure that all traces are paired as FLOW and RETURN.. This is the Low Loop Area philosophy.
It is this "rule" that is habitually ignored in all the DX amplifier layouts where the power inputs are on opposite sides of the PCB. The worst way to layout the Power Supplies !!!!!
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Last edited by AndrewT; 27th December 2012 at 11:18 AM.
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