The thing is, when a SLA is being charged at the float charge voltage range... 13.8V for a 12V SLA, it isn't all that low impedance. Remove the charger, and it will almost instantly drop to 13.2V. At best, the SLA is behaving as a very ugly high ESR electrolytic capacitor.
If you want low noise, and drift, you are better off building a good linear supply. -Chuck Harris Gary wrote:
The instruments I have used that employed an internal battery supply were meant to run off the batteries only intermittently. But that isn't the case for the OCXO. So the comparison has to be made with trickled charged batteries versus a power supply. But once we get to trickle charging, NiCads are not suitable. That might be why lead acid was used. [I'm thinking of the old Quantum noise measuring gear.] Technically SLA since we are using the batteries indoors around electronic equipment. Incidentally, I favor shunt regulators if noise is the primary concern. They are easier to design with ginormous cap filtering, while LDOs can have issues if the cap ESR is too low. Of course, shunt regulators aren't green. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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