XPost: sci.electronics.design   
   From: g@crcomp.net   
      
   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.   
      
   Danke,   
      
   --   
   Don, KB7RPU, https://www.qsl.net/kb7rpu   
   There was a young lady named Bright Whose speed was far faster than light;   
   She set out one day In a relative way And returned on the previous night.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)