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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: What do you use the chokes for ? posted by MichaelM on May 10, 2007 at 05:50:10:
The Hammond choke tweak simply connects the choke to the AC line as a parallel filter, usually with its own plug and power cord.See my recent post below for the technical details and my explanation of how it works.
It is not the same as the series chokes used in Jon Risch's filter design. Those have very small inductance (microhenrys instead of henrys). Their purpose is to block RF noise. The Hammond choke tweak's purpose is to dissipate RF noise.
Please note that Alan and I use different terminologies for what amounts to the same thing in our discussions of this tweak. The harmonic tones Alan mentions result from non-linear behavior of the AC outlet, and this non-linear behavior is part of the pathway used by RF noise to degrade the audio performance.
Also note that you can spend a lot of money on a Richard Gray Power Station device and get an optimized form of this type of filter right out of the box. The beauty of the Hammond choke is that it is less expensive and you can experiment cheaply with the number of them that you employ. The amount of DIY work required is small. There is a lot of variation in AC purity and RF noise, so you can install what is close to an optimum level of filtering for your setup with a little patience.
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Follow Ups
- Parallel AC filters. - Al Sekela 10:03:29 05/10/07 (0)
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