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In Reply to: A cheap parallel filter is the Hammond 193L choke. posted by Al Sekela on March 24, 2007 at 17:33:34:
I have a bunch of chokes around - what are the criteria for choosing one for this purpose?
Thanks,
Pete
Follow Ups:
The Hammond 193L is a 5 Henry inductor, so it will draw about 64 milliamps of reactive current with 120 VAC across it. Some of this will cause heating due to core and resistive losses, but the device should run cool. You may occasionally find one that buzzes due to loose laminations.The device will absorb higher-frequency noise and voltage spikes due to the characteristics of the magnetic core. It will not affect dynamics, as it is wired in parallel with the load.
Be sure the chokes you use have a high voltage rating for the insulation, to withstand surges before the core absorbs them.
What is your suggestion to install the choke? Just lay it around or should it be in closed box?I've ordered Hammond 193L from partsexpress, but it is out of stock now..:) can't wait to try it out those.
By the way, the cord with any guage will do? or it must be a large gauge, let say 10 gauge
Putting the choke in a protective enclosure makes sense if it will be exposed to traffic, but then you have to make sure the enclosure does not cause problems. Don't use steel or anything that will vibrate.The current will be small, but I've found in many similar tweaks that 14-gauge wire gives the best sonic results.
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