XPost: sci.electronics.design   
   From: spam@me.com   
      
   Steve Wilson  wrote:   
      
   > 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.   
      
   Here is a 20 inch La Crosse WWVB clock for $59.99   
      
      
      
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