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An ingenious solution
Let's face it, the HP35, 45, et. al., pocket calculators, revolutionary when first introduced in 1972, have long since outlived their indispensability. Still, those of us who bought one at the time like to get them out every once in a while.If you're like me, your original battery has leaked and you've lost your plug-in charger. I had a calculator I couldn't use. I found a vendor selling batteries (and bought one), but when the batteries run down, what do I do?That's when I stumbled on this USB charger assembly. Truly an ingenious and simple solution. Whoever designed it has married a standard USB 1.0 A connector to the special-purpose battery connector for the HPxx calculators. It uses the power connections (and only the power connections; the computer does not recognize the calculator as an attached device) to provide power to the HPxx (and to charge its battery, if you have one).My only reservation is the voltage. Standard USB power specs center around a nominal 5.0VDC. The calculator is specified at 3.75 volts. I don't know if the calculator can withstand 5.0VDC at all/for an extended period/??? Nor can I find any documentation about supply voltage tolerances for the HP-45. There is no documentation with the cable to indicate what (if any) limitations this places on its use. Since there is no documentation, it also can't be determined if the developer put some sort of dropping resistance in the path to get the target voltage to 3.75. This would be unlikely, as it would not only waste USB power in the form of heat, but it would require knowledge of the specific load of each HP calculator.
Verified purchase:YesSold by:davidreaton
Jun 06, 2016 Hp 50g and software. 2012 at 6:33am in Surveying Equipment and Software Talk. Some of the best software for the Hp 50 g is by Jacob Walls,you can find all this info and downloads at Simple Geospatial Solutions,there is even free downloads for emulators and free software cogo + LT this is the best i have found for this calculator and he.
Complete program suite for the HP-48GX with many solutions useful in land surveying. This set of programs solves for many common problems encountered in land surveying. It has an engineering flavor and deals with things in construction, especially roadways. Hp 50g and software. Some of the best software for the Hp 50 g is by Jacob Walls,you can find all this info and downloads at Simple Geospatial Solutions,there is. Puts the Comfort Level Back in the Classroom and Test Site with Hp 33s and 35s Surveying Solutions. With this program. This program will go on any hp 48/49.
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