From: shaun.at.pukekohe@gmail.com   
      
   On 1/10/2019 3:04 PM, ~misfit~ wrote:   
   > On 30/09/2019 8:17 PM, Jasen Betts wrote:   
   >> On 2019-09-29, ~misfit~  wrote:   
   >>> ... that I can use to drain alkaline cells and push the 'charge' into   
   either a lithium-Ion cell   
   >>> (for a flashlight), a phone or a powerbank.   
   >>>   
   >>> I have a combined wireless doorbell - inside/outside thermometer that I   
   quite like. Unfortunately   
   >>> it won't run on NiMH cells and only uses alkalines down to 1.33v. (It's   
   the only thing I have that   
   >>> doesn't run on rechargeable cells.)   
   >>>   
   >>> The sender uses AAA cells and the receiver uses AA cells and I buy good   
   quality (expensive) cells   
   >>> to get the longest run-time between changes (as it's a PITA to re-pair   
   them and re-set the clock in   
   >>> the receiver too often). I though of converting the receiver to run on a   
   single 14500 Li-Ion cell   
   >>> (AA size) and a buck regulator or even a wall-wart but that still doesn't   
   solve the issue of the   
   >>> sender.   
   >>>   
   >>> I dislike throwing good quality alkalines away when they still have ~65%   
   of their capacity   
   >>> remaining but have had enough leak-disasters to not want to put already   
   semi-discharged cells in   
   >>> remote controllers etc. where they then get forgotten about until things   
   stop working. (I've never   
   >>> had an Eneloop leak and they run my remotes for about 3 years between   
   charges.)   
   >>>   
   >>> So I'd like to make a gizmo that takes a single alkaline and pushes out   
   ~5v through a USB cable for   
   >>> as long as the cell has juice, preferably at a reasonable current. I have   
   a few different pre-made   
   >>> boost modules from the usual suspects but when I tested one the output   
   voltage curve dropped with   
   >>> the input so that it wasn't very successful.   
   >>   
   >> these are cheap and will do it   
   >> https://aliexpress.com/item/32786144773.html   
   >   
   > I've actually already got some of those in my 'module collection'.   
      
   My bad, just checked and I don't have those. I have some of these   
    and at first glance I   
   thought they were the same   
   thing. I really need to 'index' my module collection.   
   --   
   Shaun.   
      
   "Humans will have advanced a long, long way when religious belief has a cozy   
   little classification   
   in the DSM"   
   David Melville   
      
   This is not an email and hasn't been checked for viruses by any half-arsed   
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    * Origin: you cannot sedate... all the things you hate (1:229/2)