HP Forum Archive 17

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HP-19C charger... Message #1 Posted by Geir Isene on 7 Mar 2007, 7:07 a.m. ... I could use the same as... which charger?

Re: HP-19C charger... Message #2 Posted by Ignazio Cara (Italy) on 7 Mar 2007, 11:30 a.m., in response to message #1 by Geir Isene Hello Geir Isene, you can use the HP-97 charger like HP 82066A, without any kinds of problem. Regards from Italy Ignazio Edited: 7 Mar 2007, 11:34 a.m.

Re: HP-19C charger... Message #3 Posted by Eric Smith on 7 Mar 2007, 6:37 p.m., in response to message #1 by Geir Isene For standard US power receptacles (90-120V, NEMA 5-15R), you would want an 82059 (any suffix A through D). These are very common, as the B suffix and later used with the HP-91/92/97/97S, 41C with 82120A rechargeable pack, 82143A and 82162A printers, 82161A tape drive, HP-71B, HP-75C/D, etc. Note that the 82059A is not suitable for some of the newer devices; I think that is due to a change to the shape of the plug; the newer devices require a full slot in the plug. For 90-120V Europe (where?) the charger is the 82069B. For 210-250V, the choices are 82066A/B/D (Europe), 82067B (United Kingdon), 82067B Option 001 (South Africa), and 82068B (Australia). Although none of these charagers are universal voltage, you should be able to use any charger that is suitable for your local voltage with a plug adapter. If you need to use a 90-120V adapter on 210-250V power, or vice versa, you can do that with a voltage converter.

Re: HP-19C charger... Message #4 Posted by Tony Duell on 8 Mar 2007, 1:22 p.m., in response to message #3 by Eric Smith Some of these chargers have a pair of inverse-series zener diodes inside the conenctor moulding, I think they're rated at 27V each. This is mentioned-in-passing in the PortablePlus Technical Reference Manual, and I actually did electrical tests on a spare cable to confirm this. I don't know if all 'Topcat series' chargers have these zeners, I suspect they may have been fitted to the new type of plug only. FWIW, the difference between the -A and -B Woodstock and Spice chargers (you're supposed to only use -B versions on machines with continuous memory) is a similar pair of zeners. Personally, therefore, I'd only charge a 19C, a 95C, or any other machine with continuous memory from a charger fitted with the zeners.

Re: HP-19C charger... Message #5 Posted by Eric Smith on 8 Mar 2007, 8:19 p.m., in response to message #4 by Tony Duell Thanks, I always wondered what the difference between the -A and -B chargers for the Woodstock and Spice series. Why would they mold the zener diodes into the connector, rather than putting them in the transformer housing? And I wonder why they didn't use even lower voltage zeners, since 27V is well above the level likely to cause damage. It still seems unconscionable that the calculators themselves don't have sufficient overvoltage protection to survive the expected input voltage peaks with no battery present. They saved at most around $0.25 per calculator, on models with retail prices of $120 and up. It's hard to believe that anyone involved really believed this was a good idea.

Re: HP-19C charger... Message #6 Posted by Walter B on 7 Mar 2007, 6:59 p.m., in response to message #1 by Geir Isene Remember to have good rechargable batteries installed before plugging in the specified charger. Otherwise you may roast your 19C, and you will want to avoid this, won't you?

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