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Re: New Backup Battery Circuit
CJohnson,
One thing I noticed is that the schematic in the National data sheet which you reference shows the battery as the only load in the charging circuit. If you plan on connecting the output of your circuit to the RC backup battery input, which you must do, then you'll provide a short circuit around R3 through the RC's ground connection back to the circuit breaker panel. I think that'll eliminate any current limiting ability of R3.
Steve
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