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|    sci.electronics.basics    |    Elementary questions about electronics    |    72,318 messages    |
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|    Message 72,112 of 72,318    |
|    Phil Allison to bobenge...@gmail.com    |
|    Re: Confirmation needed    |
|    29 Aug 21 23:31:10    |
      From: pallison49@gmail.com              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              --- SoupGate-Win32 v1.05        * Origin: you cannot sedate... all the things you hate (1:229/2)    |
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