Questions about Ti-58c power supply
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06-27-2019, 08:26 PM
(This post was last modified: 06-28-2019 08:49 AM by Nigel (UK).)
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RE: Questions about Ti-58c power supply
(06-27-2019 09:30 AM)Doctor_Jacek Wrote: Hi everyone, (a) Probably. There’s a bridge rectifier circuit connected to the input, so the 5.0 V from the USB goes through 2 diode drops, bringing it down to 3.8 V which should be close enough to the normal battery voltage to run the calculator. (b) Yes. I’ve done this, soldering a Li-Po connector direct to the terminals and housing a 700mAh battery in an empty BP-1A case. I’ve also used Ni-MH battery packs that I originally bought for HP classic calculators. These work too, but the Li-Po solution is lighter and less cramped, although the capacity is less. Just to be clear: I don’t recharge these batteries in the calculator. Your 5.0 V supply might work for the Ni-MH pack, but it won’t be optimal. It certainly wouldn’t recharge the lithium cell. I recommend using a proper charger for either battery type. (c) Any will work, so long as it physically fits in the space available. My 700mAh fits easily. Differences in capacity don’t imply differences in power. The Li-Po cell I use in my TI-59 easily powers card reading and writing, and lasts for several hours. Nigel (UK) Edit: By the way, welcome to the forum! |
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Questions about Ti-58c power supply - Doctor_Jacek - 06-27-2019, 09:30 AM
RE: Questions about Ti-58c power supply - Nigel (UK) - 06-27-2019 08:26 PM
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