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HP 35S battery drain
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10-22-2022, 07:35 PM
(This post was last modified: 10-22-2022 07:35 PM by cjsmithuk.)
Post: #5
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RE: HP 35S battery drain
I may be wrong about the diode arrangement in that schematic as it's difficult to tell what it is in circuit. I would have thought that each battery would be bypassed by a single diode which would allow that behaviour.
It will run quite happily down at around 2 volts though. I think what they did here was power it with 5V from the LDO and use a voltage indicator for the battery light when that went below 5V. The series pair would have to discharge from 6V down to <5V for the battery light to come on. Either way the circuit is a bit cruddy. |
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HP 35S battery drain - cjsmithuk - 10-22-2022, 11:51 AM
RE: HP 35S battery drain - Steve Simpkin - 10-22-2022, 05:00 PM
RE: HP 35S battery drain - cjsmithuk - 10-22-2022, 05:11 PM
RE: HP 35S battery drain - Steve Simpkin - 10-22-2022, 07:16 PM
RE: HP 35S battery drain - cjsmithuk - 10-22-2022 07:35 PM
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