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In the Forum: Analog Playback
In the Thread: The last phonocorrector: “End of Life" Phonostage
Post Subject: Choke ringing againPosted by N-set on: 2/9/2012
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 Romy the Cat wrote:
In my view the Ringing of chokes is a BS reason that was invented by manufacturers who do not want to spend money for input chokes. Any book has formulation to calculate the critical inductance and if you are meeting the conditions then it will be no ringing. You do not even need to calculate anything – juts put a scope to the diodes before the choke and bleed the current unit the voltage drop after the diode shutting down voltage does to zero. It’s it.

The Cat


Not that it would be so important but, ringing of a choke (or actually choke-transformer-1st cap tank) has nothing to do with the critical inductance needed to maintain the constant current. What heavy bleeding does is exactly lowering the Q of the
parasitic tank which oscillates excited by the switching.

Cheers,
N-set

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