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Passive analog filter --> coils with ferrite core ?
Passive analog filter --> coils with ferrite core ?
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Old 27th February 2007, 07:12 PM   #1
Bernhard is offline Bernhard  Germany
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Default 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 ?
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Old 27th February 2007, 07:20 PM   #2
tubee is offline tubee  Netherlands
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Maybe they could give a uneven harmonic distorsion.
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Old 27th February 2007, 07:32 PM   #3
Bernhard is offline Bernhard  Germany
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uneven = odd ?
hysteresis ?

How is your saa2pcm schematic ?
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Old 27th February 2007, 07:52 PM   #4
tubee is offline tubee  Netherlands
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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.
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