Passive analog filter --> coils with ferrite core ?

Bernhard · 27th February 2007, 07:12 PM

In the early times of CD there have been non os players with brickwall filters - active hybrids with op amps and SMD filter caps, those sounded not very good - and also passive LCLCLCL filters that used coils with ferrite cores.

Are those ferrite cores something to worry about ?

tubee · 27th February 2007, 07:20 PM

Maybe they could give a uneven harmonic distorsion.

Bernhard · 27th February 2007, 07:32 PM

uneven = odd ?
hysteresis ?

How is your saa2pcm schematic ?

tubee · 27th February 2007, 07:52 PM

Hi Bernard

Oh sorry yes i ment odd harmonics.

Hysteresis could be of no concearn, low currents used.

The saa7210-pcm schematic is not ready. At least the whole setup, because i discovered something peculiar: treble output is attenuated when the whole warms up, the sound is annoying me then. Right after switch on it sounds rather good. CDM problems stops me from further experiments also.

27th February 2007, 07:12 PM	#1
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	Passive analog filter --> coils with ferrite core ? In the early times of CD there have been non os players with brickwall filters - active hybrids with op amps and SMD filter caps, those sounded not very good - and also passive LCLCLCL filters that used coils with ferrite cores. Are those ferrite cores something to worry about ?

27th February 2007, 07:20 PM	#2
tubee diyAudio Member Join Date: Jul 2004 Location: Netherlands	Maybe they could give a uneven harmonic distorsion. __________________ Daisy Bell

27th February 2007, 07:52 PM	#4
tubee diyAudio Member Join Date: Jul 2004 Location: Netherlands	Hi Bernard Oh sorry yes i ment odd harmonics. Hysteresis could be of no concearn, low currents used. The saa7210-pcm schematic is not ready. At least the whole setup, because i discovered something peculiar: treble output is attenuated when the whole warms up, the sound is annoying me then. Right after switch on it sounds rather good. CDM problems stops me from further experiments also. __________________ Daisy Bell

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27th February 2007, 07:32 PM	#3
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	uneven = odd ? hysteresis ? How is your saa2pcm schematic ?

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