smbrush@lims05.lerc.nasa.gov (ANDREW BRUSH) (05/01/91)
I have a HP34-C which the contacts in the battery compartment have broken off of, making it impossible to use the original 3-AA NiCd battery pack. I'v been thinking about opening the case, and soldering on leads which could be connected to a 3-AAA alkaline battery pak, or whatever. Here are my questions: Has anyone done this before? Does anyone know if the jump from 1.25V to 1.5V in cell voltage will hurt the calculator? I have newer, smaller calculators, so I don't care about portabilty for the 34 too much... I just want to leave it plugged in to the adapter at my desk. Does anyone have ideas for some circuit which will allow me to do this without batteries (I already know that it won't work on the adapter as-is). Thanks in advance for your help. Andrew S. Brush | SMBRUSH@EARTH.lerc.nasa.gov Sverdrup Technology | 2001 Aerospace Parkway NASA LeRC Group | Brook Park, OH 44142 "Opinions are Mine, Only" | (216) 826-6770
HCLIMER%UTCVM.BITNET@CUNYVM.CUNY.EDU (Harold Climer) (05/02/91)
I did something similar to what you describe with an old TI-51 that I keep on
my electronics workbench in my basement. I used a SSMMAALL tipped soldering
iron to solder leads to the circuit board. This is the part where you must be
careful. Make sure the iron is hot. You don't want to keep it in contact with
the board for very long. Also tin the leads before-hand. Connecting the leads t
o the battery pack is not quite as critical,but you still must be careful.
Good Luck
Harold Climer
Physics Department
U. Tennessee Chattanooga