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In Reply to: Jeff's 22 mH choke posted by mikeyb on April 24, 2007 at 09:14:00:
two things.what exactly do you expect the inductance of this device to be at 120hz and why?
Why does the 120hz behavior even matter. It has never been stated that the alleged benefits from its use has anything to do with ripple frequency.
Follow Ups:
Well, in theory, 16 Ohms impedance ( Z = 2*pi*f*l). Although when you think about, it better have a really low impedance at 60 HZ because in the intended use, it is placed in series with the line voltage. You wouldn't want it to look like 16 Ohms!I brought the subect up soley to point out that this choke clearly does not have a significant effect at the ripple frequency, so that the observed audio benefits must be due to the high frequency characteristics of the choke. It really isn't transforming a CRC filter into a LCRC filter, at least not in the traditional sense.
small value chokes used on the incoming AC line will reduce high order harmonics created from switch mode supplies/diode conduction spikes.I didn't bother to look at the data sheet. I just happen to be involved/concerned with reduction of odd order harmonics in power distribution systems.
That's what they are designed to do. However, when used as a filter choke in a DC supply, I really don't know what they will do.
to the 60hz line voltage this device (when wired as intended) should have near zero inductance.To be honest, i have no idea how Jeff is using this device, up until recently i was expecting it to be a traditional steel cored DC-carrying choke. Now that I know it is a common mode device (4 terminal), there are several possible ways to hook it up and it will behave differently depending how you do it.
Jeff.... how exactly did you wire this particular device? If you have an extra I'll gladly measure it to see how it behaves in circuit with your chosen hookup.
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