Path: ...!Xl.tags.giganews.com!local-1.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Mon, 10 Jun 2024 01:24:04 +0000 From: john larkin Newsgroups: sci.electronics.design Subject: Re: A collection of monographs on high accuracy electronics Date: Sun, 09 Jun 2024 18:24:04 -0700 Message-ID: References: <33c76j1cr78uhuk3djabivck4gbpe4dq9i@4ax.com> <6djc6jhurdaoqkvgnp0rcb1f4tci4da5pm@4ax.com> User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 65 X-Trace: sv3-euhvP32qQpt5K3KcITBvz6YnJxhL/UgzGKHeK2TBMapKQOunLPCCFm4W2sm+G7mQvltHYbnW+OFhVKa!EeEL4PHHMesyO1c1SUF9U9Xbo2qLXVd8/foGHxZpjSqpLK3YZxZTLXcZch1jHphn2EpPQ08BUddJ!pE33MQ== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 3573 On Mon, 10 Jun 2024 01:55:51 +0100, JM wrote: >On Mon, 10 Jun 2024 00:29:17 -0000 (UTC), Phil Hobbs wrote: > >>JM wrote: >>> On Sun, 9 Jun 2024 18:09:24 -0000 (UTC), Phil Hobbs >>> wrote: >>> >>>> Jeroen Belleman wrote: >>>>> On 6/9/24 19:02, ehsjr wrote: >>>>>> On 6/7/2024 9:14 PM, JM wrote: >>>>>>> A collection of monographs on high accuracy electronics written by Mr. >>>>>>> Chris Daykin, following his career predominantly in metrology. >>>>>>> >>>>>>> Unfortunately Chris will be unable to complete the unfinished >>>>>>> monographs (having started end of life care) but there is plenty of >>>>>>> interest to any analogue engineer. >>>>>>> >>>>>>> https://1drv.ms/b/c/1af24d72a509cd48/EZhO_rP5-glDmxtc4ZHycvYBhrsqmyC5tuZjt2NFFsS0gQ?e=Wq2Yj0 >>>>>> >>>>>> >>>>>> Thanks! >>>>>> Ed >>>>> >>>>> I have an issue with his definition of resistor noise power >>>>> as the product of open-circuit noise voltage and short-circuit >>>>> current. That makes no sense. >>>>> >>>>> There's more than that, probably, but that just jumped out at >>>>> me. >>>>> >>>>> Jeroen Belleman >>>>> >>>> >>>> It?s four times too high, for a start. >>>> >>>> Cheers >>>> >>>> Phil Hobbs >>> >>> "It is shown elsewhere [1] that the noise power is four times the heat >>> energy which would flow down the conductors >>> from a warm source resistor to a matching cold resistor." >>> >> >>Which, if true, would solve all our energy problems, except that >>thermodynamic systems would all be unstable. >> >>The thermal noise power produced by a resistor into a matched load is kT >>per hertz. >> >>Cheers >> >>Phil Hobbs > >Sure, which is what he states. By mentioning a hot and cold resistor he makes it clear that net energy flow is from hot to cold, and that the T refers to the hot source. If you connect two resistors, the noise voltages create an equivalent thermal conductivity. I did the math once and I recall that any reasonable real wires would conduct a lot more heat. And in real life, capacitance will kill the bandwidth and the heat transfer.