From: BobEngelhardt@comcast.net   
      
   On 8/30/2021 2:55 PM, Bob Engelhardt wrote:   
   > On 8/30/2021 2:31 AM, Phil Allison wrote:   
   >> bobenge...@gmail.com wrote:   
   >>>   
   >>>> ** Yep two:   
   >>>>   
   >>>> 1. The drop out voltage of a standard 12v reg IC is not 12.8 - more   
   >>>> like 13.8.   
   >>>> 2. The AC supply varies and may be be 10% low on occasion.   
   >>>>   
   >>>> So, you need a 15VAC tranny.   
   >>>>   
   >>>> OR you can make a "voltage doubler" supply with two diodes and two   
   >>>> electros.   
   >>>>   
   >>>> That will give about 33V DC - minus the same deductions.   
   >>>>   
   >>>   
   >>> Thank you - that is helpful in 2 ways: pointing out what I missed &   
   >>> was wrong about, and even more helpful is not having to correct my   
   >>> analysis.   
   >>   
   >> **   If your 12v tranny is really small, like say 100mA  -  it will   
   >> output about 15V to 16v  AC off load.   
   >>   
   >>       So would do at a pinch with a puny 10mA DC load .   
   >>   
   >>   
   >> .......  Phil   
   >>   
   >>   
   >>   
   >>   
   >>   
   >   Thanks again - I will take some measurements on the tranny.   
      
   Thanks again - that's good to know.  The OC voltage is 15v & it doesn't   
   drop below 12v until loaded to 200ma.  That gives me a lot of working room!   
      
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