On Fri, 5 Jun 2015, g wrote:> On 06/05/2015 03:43 PM, John R Pierce wrote: >> On 6/5/2015 1:33 PM, Michael Hennebry wrote: >>> It's a desktop in an old house. >>> The outlets have ground-fault protection, >>> but the third prong is ungrounded. >> >> not sure how GFI would function at all without a valid ground, unless >> the GFI is wired to neutral, which is dangerous on its own.As I understand it, GFI sums the currents going into each prong. If the sum is not close enough to zero, it breaks the circuit.>> also, things like fluorescent lamps can greatly contribute to hum, >> although that often sounds like a buzz. lamp dimmers too, try >> switching any dimmers in the general area to either 100% on or >> totally off.No dimmers, but I tried turning off the overhead flourescent lights. No effect.>> not really, the wire itself has to be shielded coaxial wire. if its >> actually the headset itself, I'd suggest getting another one. >> >> I've had better luck with USB headsets of late instead of analog >> ones plugged into on-board audio, as the onboard audio microphone >> inputs are generally of very poor quality. > > even with usb headsets, quality/cost is to be considered. > > cheap preforms as cheap is. > > low the price, lower the quality of results. > > you get what you pay for.More precisely, you pay for what you get. Getting what you pay for is iffier. -- Michael hennebry at web.cs.ndsu.NoDak.edu "SCSI is NOT magic. There are *fundamental technical reasons* why it is necessary to sacrifice a young goat to your SCSI chain now and then." -- John Woods
On 6/5/2015 2:16 PM, Michael Hennebry wrote:> On Fri, 5 Jun 2015, g wrote: > >> On 06/05/2015 03:43 PM, John R Pierce wrote: >>> On 6/5/2015 1:33 PM, Michael Hennebry wrote: >>>> It's a desktop in an old house. >>>> The outlets have ground-fault protection, >>>> but the third prong is ungrounded. >>> >>> not sure how GFI would function at all without a valid ground, unless >>> the GFI is wired to neutral, which is dangerous on its own. > > As I understand it, GFI sums the currents going into each prong. > If the sum is not close enough to zero, it breaks the circuit.I thought it monitored the current on the ground pin, and if there is ANY significant ground current, it disconnects the line and neutral pins, shutting the socket off.. -- john r pierce, recycling bits in santa cruz
On 06/05/2015 04:16 PM, Michael Hennebry wrote:> On Fri, 5 Jun 2015, g wrote:<<>>> As I understand it, GFI sums the currents going into each prong. > If the sum is not close enough to zero, it breaks the circuit.not quite. see; https://en.wikipedia.org/wiki/Residual-current_device <<>>> No dimmers, but I tried turning off the overhead flourescent lights. > No effect.anything else with transformers, like maybe a tv, stereo?>> you get what you pay for.> More precisely, you pay for what you get.better yet, you pay for quality from a quality company.> Getting what you pay for is iffier.if i pay for quality, it will be to a quality company. now we are getting 'off subject'. -- peace out. If Bill Gates got a dime for every time Windows crashes... ...oh, wait. He does. THAT explains it! in a world with out fences, who needs gates. CentOS GNU/Linux 6.6 tc,hago. g .
On Fri, 5 Jun 2015, g wrote:> On 06/05/2015 04:16 PM, Michael Hennebry wrote: >> On Fri, 5 Jun 2015, g wrote: > <<>> > >> As I understand it, GFI sums the currents going into each prong. >> If the sum is not close enough to zero, it breaks the circuit. > > not quite. see; > > https://en.wikipedia.org/wiki/Residual-current_deviceI should have written "into two prongs". I have a "headset" that works now. I'd forgotten that I bought it and still do not remember why. Apperently it's a "universal all-in-one stereo earset". Despite the name, it does have a usable miocrophone. -- Michael hennebry at web.cs.ndsu.NoDak.edu "SCSI is NOT magic. There are *fundamental technical reasons* why it is necessary to sacrifice a young goat to your SCSI chain now and then." -- John Woods