HP 19C Charger

[DEJR8ISGREAT]

I bought a 19C on EBAY without a charger, I thought I saw in the Museum that the charger could be a 82059A or B, so I purchased a 82059B, but on closer inspection that says for 7 watts, would it still be safe to use? Or would it fry the 19C? I can't find a 82059A...

[Karl-Ludwig Butte]

Hello DEJR8ISGREAT,

the Owner's Handbook for the HP-19C/29C from September 1977 lists on page 180 the HP-82059A as AC adapter/recharger for the 19C. For the 29C the HP-82026A is listed as AC adapter/recharger. Unfortunately, no other technical data is listed except for the input voltage:
- HP-82059A: 90-127Vac, 50-60Hz
- HP-82026A: 90-127Vac, 50-60Hz or 200-250 Vac, 50-60 Hz
So maybe the only difference between the two is the input voltage. If you're living in Europe and your power station provides 200-250 Vac you should avoid the 82059A.

Best rgards

Karl

[rprosperi]

The 82059B adapter is correct for a 19C and can safely be used, assuming the battery pack is installed and in good condition and working properly. While I don't believe the 19C suffers from the same poor power supply design as normal Woodstock machines, it's always best to ensure proper working conditions with vintage equipment.

[AndiGer]

An always very good reference is Kees's page:
https://www.keesvandersanden.nl/calculat...argers.php

BTW: My HP82066B (Europe) also has 3VA, 8 VDC. (But I don't own an HP-19C or HP-10)

[DEJR8ISGREAT]

Thank you for your posts, one more question, it goes into the calculator both ways, does that matter, I thought one side is positive and one negative. The only difference I see is a very small slightly raised rectangle on the plug that connects to the port, like I say it fits both ways. Yes I did get a new battery, amazing what a 3D printer makes.

[rprosperi]

(06-14-2021 03:28 PM)AndiGer Wrote:  An always very good reference is Kees's page:
https://www.keesvandersanden.nl/calculat...argers.php

BTW: My HP82066B (Europe) also has 3VA, 8 VDC. (But I don't own an HP-19C or HP-10)

Pretty sure that should be 8 VAC, not DC. At least the 82059A/B/D adapters are 8 VAC.

There is no PLUS or MINUS, since it's an AC power supply. It can be installed either way.

[AndiGer]

Of course, it's 8 VAC - only a transformer