XPost: sci.electronics.design   
   From: spam@me.com   
      
   jlarkin@highlandsniptechnology.com wrote:   
      
   > On Sun, 8 Nov 2020 21:08:18 -0000 (UTC), "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,   
   >   
   > The 317 may not be stable without an output capacitor, aluminum or   
   > tantalum.   
   >   
   > Does the clock stepper motor use big current spikes every tick?   
   >   
   > Really, can't you solder the wires?   
      
   The clock will drift. Eventually it will be so far off the correct time   
   to be useless.   
      
   Don lives in Casper, WY. He should have no problems picking up WWVB:   
      
   https://tf.nist.gov/stations/wwvbcoverage.htm   
      
   There are a large number of inexpensive WWVB wall clocks that are large   
   enough to read from a distance. These will keep time to better than a   
   second.   
      
   You can even get a kit to convert an ordinary clock to WWVB. Search   
   Amazon.   
      
   I use a HTAWI WWVB clock that is 16 inches in diameter. It is easy to   
   read from many feet away. It has 3 batteries and will switch   
   automatically when a cell runs down. I expect it to last 3 years or more   
   and keep perfect time.   
      
   --   
   Science teaches us to trust. - sw   
      
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