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| General Electronics Chat This forum is for general chat about electronics, eg: Dont know what a part does? Dont know how to read a circuit? Want to get an opinion? |
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19th February 2004, 05:48 PM
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Need power requirements for an HP 67 calculator
Found an old calculator and I want to power it up--the batteries are dead and no charger.
Anybody know what V/A the power input is looking for?
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19th February 2004, 06:25 PM
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How many cells the battery and what type?
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19th February 2004, 07:28 PM
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Three batteries in the battery pack. I read somewhere that they are 3.75V, but I don't know if they are in series or parallel.
I just hooked it up to a power supply and gave it 5V. It turned on and seemed to work okay, so I guess 5V is okay. That also must mean that the three batteries are in series. A low voltage light came on if I lowerd the power to 4V.
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