Re: Spares for vintage calculators HP-25, HP-27? Message #2 Posted by samo on 2 Mar 2012, 8:31 a.m., in response to message #1 by McAllan
Hello there,
Thank you for your replies and help.
It seems however that the topic turned into AC charger/adapter issues. Beeing an B.Sc in electrotechnis I may fully agree with all of you, since NiCd's are almost history now, and also the D-R circuit does not really protect for overvoltages. However, I have used my HP-25 together with my brother and sister for more than 15years, in this time I had to buy another replacement NiCd pack (memory effect) and allways charged them with my original AC/Adpater w/o any problems, until this same went broken/burnt and then lost somewhere.
I would like to have the original AC adpater mainly for two reasons:
1) to complete the HP-25 package
2) because I could use the original cable/plug and design/build a more clever charger which could accomodate even NiMHs perhaps.
Anyway, even if i have not posted my original topic in the advertisment area, I would appreciate, if anyone has some "weird" parts to pass/sell over.
Thank you
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