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In Reply to: RE: Shunt resistor choice (possibly correct or incorrect math)??? JR?? posted by Brick527 on August 12, 2020 at 13:24:58
Thanks for the tips, Brick527.
BTW, that Vishay Dale Mil-Spec resistor was pricey when purchased in small quantity.
Any suggestion of a low-cost option that is appropriate for the task? What would be the ideal power rating and resistance value for the application?
Cheers, Duster
Follow Ups:
Duster ,a standard metal film at 1 watt between 50k and 1 meg would do. With such minor amounts of capacitance involved you don't need much current to discharge them.If you were talking about a hundred microfarads or more than you would need more current to discharge them in a reasonable time.
Alot of power conditioners don't use bleeders at all.
I've become more vigilant about the matter after following a fellow solder slinger who tends to be very careful when handling a device without a resistive load. I've fingered too many IEC inlets while swapping-out power cords on the back of an audio component to see which orientation the ground prong is located; I don't even wish to see what it might feel like to get even a minor zap if there are no power cords plugged into a power line conditioner/distributor. Sometimes it takes actually being shocked by AC current before one takes more care...
I agree with your reasoning.Just put it out there that not all adhere to that practice.
It's also a reason why it's safe practice that a DIY power cord with a 3-pole IEC connector should always have a ground wire, even if it's intended for an audio component with an ungrounded IEC inlet. On the other hand, if the entry hole for the ground prong is *permanently* blocked within the IEC connector, perhaps that's enough to ensure the safety of the power cord, if and when it might fall into the hands of an unsuspecting user in the future.
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