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   PID: SoupGate-Win32 v1.05   
   On 16/03/2024 17:56, bp@www.zefox.net wrote:   
   > bp@www.zefox.net wrote:   
   >> side, you could put it all downstream of the Pi power supply   
   >> and skip line detection entirely. That's a big advantage.   
   >>   
   > On second thought, this is probably wrong. If one connects   
   > to a Pi a 5 volt supply in parallel with a blocking diode   
   > and a 6 volt battery, the diode is still forward biased   
   > and will drain the battery eventually. Some kind of switch   
   > is needed, controlled by line detection.   
   >   
   > Maybe a three terminal regulator set for 5 volts out powered   
   > by a 9 (or higher) volt battery pack could be substituted.   
   > Still, one has to consider the idle draw of the regulator.   
   > TI's LM340 takes 6 mA roughly. Still, that's a smallish   
   > supply for a Pi. You'll likely want something larger.   
   >   
   > Apologies for the red herring!   
   >   
   > bob prohaska   
   >   
   I think the chances of finding an 'ideal' battery are relatively slender.   
   You are likely forced into some sort of 5v switched mode regulator - and   
   its probably wisests at least for a single Pi - to have that permanently   
   delivering power and just have the battery on permanent mild charge   
   --   
   The New Left are the people they warned you about.   
      
   --- SoupGate-Win32 v1.05   
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