XPost: sci.electronics.design   
   From: erichpwagner@hotmail.com   
      
   On 09/11/2020 3:35 pm, Steve Wilson wrote:   
   > 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.   
   >   
      
   +1 on Faraday. Had the great pleasure to visit the Royal Institution in   
   London where Faraday worked.   
      
   piglet   
      
   Science teaches us to verify.   
      
   --- SoupGate-Win32 v1.05   
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