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HP35 problem with a calculator, maybe due to a faulty charger
04-01-2021, 06:23 AM
Post: #24
RE: HP35 problem with a calculator, maybe due to a faulty charger
Related to this, and with my fear of using the old chargers in my calculators, I modified and build my own charging pack.
I followed the information on this page:
https://davidreaton.com/hp-calculators/h...-chargers/
Replaced the resistor (and the capacitor) to lower the charging current from the charger, and built my own external charger with led feedback.

   

Right now I just built it on a prototype board, but will make a better box for it when I get the time ... Big Grin
So now I can slowly charge the NiMH batterypacks outside the calculator in a safe way Wink

Cheers,
Thomas

[35/45/55/65/67/97/80 21/25/29C 31E/32E/33E|C/34C/38E 41C|CV|CX 71B 10C/11C/12C/15C|CE/16C 32S|SII/42S 28C|S 48GX/49G/50G 35S 41X]
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RE: HP35 problem with a calculator, maybe due to a faulty charger - ThomasF - 04-01-2021 06:23 AM



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