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'Homebuilt' voltage regulator to replace old unsafetied regu

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Ceengland

Joined: 11 Oct 2020
Posts: 393
Location: MS

Posted: Thu Oct 20, 2022 1:16 pm Post subject: 'Homebuilt' voltage regulator to replace old unsafetied regu

Just saw this article about the L9918 alternator regulator from ST 

Microelectronics. I'm curious about whether it might be viable as a 

replacement for the unprotected regulators still found in some of the 

older 'one wire' alternators many of us still use, or perhaps, even for 

an externally regulated alternator.



It has a lot of sophisticated features we'd likely never use, but a 

quick stroll through the data sheet (link in the article) makes it sound 

as if it will function just fine in standalone mode. Five terminal 

device, but the 5th terminal is basically a 'comm' terminal, which the 

data sheet implies can be lost and the regulator will still function 

properly. It does have OV & UV protection built in. At a onesies cost of 

<$10, it certainly looks tempting to try.



Charlie



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