HP35 problem with a calculator, maybe due to a faulty charger

[aurelio]

(04-01-2021 06:23 AM)ThomasF Wrote:  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 ...
So now I can slowly charge the NiMH batterypacks outside the calculator in a safe way

Cheers,
Thomas

thank-you Thomas I know that interesting site that iis the same Ivisited and linked in a previous thread The circuit has been rebuilt using modern transistors nowadays available