Very cheap working ti-58c

[Jlouis]

(10-27-2019 11:22 PM)Garth Wilson Wrote:  I got a TI-30 from a yard sale that someone had put a 9V battery snap in, probably because the original NiCad battery died. It does work, but I'm not sure I'd want to try that on a 58c.

I have a TI-30 running in a 9v battery and I also adapted a TI-55 to run into a 9v battery. The TI-55, IIRC, had some rechargeable ni-cad batteries (I don't remember how many) and a very simple circuit to convert AC from the wall charger to DC.The retrofit is very simple, although I had to trim the battery compartment door because it didn't close with the 9v battery in. Other weird thing is that you have to mend the black wire from the battery with the red wire from the calclator and vice versa, I don't remember why.

One thing I love in the TI-30 is when the calculator is "thinking" when calculating something, i.e.when the last led runs rapidly from zero to nine....it is amazing the 55, 58 and 59 don't have this amazing "feature".

Other thing I like in the ti30 and 55 is when they enter in the power save mode, one dash runs from left to right . ..it's really nice, at least for me.

As for the ti58 and ti59, Bob is right, a 9v baterry conected on them will fry the calculators Before I refurbished a pack for them, I used a stable 5v power source without any problems, but the calculator must not have the battery pack in place.