XPost: sci.electronics.design   
   From: spam@me.com   
      
   piglet  wrote:   
      
   > On 09/11/2020 2:06 pm, Don wrote:   
   >> In sci.electronics.design piglet  wrote:   
   >>> On 08/11/2020 9:08 pm, Don wrote:   
   >>>> This project shows how to build a 1.5 VDC pseudocell to take the   
   >>>> place of an AA sized battery. The mechanical aspect of this project   
   >>>> offers the greatest challenge. The electronic portion utilizes an   
   >>>> easy to use LM317 adjustable voltage regulator to convert a 5 VDC   
   >>>> source to 1.5 VDC.   
   >>>>   
   >>>> (excerpt)   
   >>>>   
   >>>> https://crcomp.net/pseudocell/index.php   
   >>>>   
   >>>> (Thank you In Advance to readers who alert me to typos and   
   >>>> whatnot.)   
   >>>>   
   >>>> Danke,   
   >>>>   
   >>>   
   >>> Your circuit design description states that R3 provides the minimum   
   >>> 10mA load current. Yet the value of R3 is 15k which only draws 0.1mA   
   >>> which when added to the R1/R2 divider current of 1.13mA means the   
   >>> minimum load on the LM317 is only 1.2mA far short of the stated 10mA   
   >>>   
   >>> You don't even need R3 - just change R1 to 120R and R2 to 24R.   
   >>   
   >> Excellent! (As always, BTW.)   
   >>      Looks like my worst fear was realized as sloppy discipline   
   >>      allowed   
   >> a decimal point to slip down from mils to micros. Your hint about how   
   >> to eliminate R3 is much appreciated too.   
   >>      My approach to technology previously untapped by me is to   
   >>      approach   
   >> it with caution. And a R2 of hundreds of ohms somehow seemed safe,   
   >> until you helped me see things clearly in my mind's eye.   
   >>      Anyhow, the perfboard will be quickly rebuilt with correct   
   >> components. It's mounted on an easily accessed backboard and plugged   
   >> into a strip connected to the UPS used for the phone system. The last   
   >> bit doesn't matter much, given how a long pole will be used to   
   >> correct the clock's drift.   
      
   A long pole risks damaging the clock hands.   
      
   A WWVB clock will correct the drift and automatically switch for daylight   
   savings. Batteries can last 3 years.   
      
   >> Danke,   
   >>   
   >   
   > Thanks Don, you are very welcome.   
   >   
   > piglet   
   >   
   > Science teaches us to verify.   
      
   I like your sig. Much better than doubting.   
      
   Claude Bernard is an interesting figure and is held as the first   
   scientist.   
      
   Actually I think that title should go to Michael Faraday and others from   
   his era.   
      
   Quote   
      
   "Michael Faraday (born Sept. 22, 1791) was a British physicist and   
   chemist who is best known for his discoveries of electromagnetic   
   induction and of the laws of electrolysis. His biggest breakthrough in   
   electricity was his invention of the electric motor."   
      
   https://www.thoughtco.com/michael-faraday-inventor-4059933   
      
   https://www.sciencehistory.org/historical-profile/michael-faraday   
      
   Tesla was credited with invention of the electric motor, but he was a   
   century too late.   
      
   --   
   Science teaches us to trust. - sw   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)