Charger for Classic



#2

Hi everybody on the Forum.

Is there the possibility to build a charger for a Classic from scratch?

Would it be possible to use one of the many chargers around for other devices?

And waht about the connector to the calc?

I couldn't find a lot on this matter over the Museum (OK, batteries are well covered)

so any suggestion would be very welcome.

Thank you all.

Ciao.

Giancarlo


#3

Why? There are plenty of them on the market. If you send me an e-mail I can offer you one with European plug and voltage, working for sure.

Regards, Walter

#4

Hello Giancarlo,

The charger for a classic is actually two power sources in one...
A constant voltage source of about 5VDC to run the calculator,
and a constant DC current source to charge the batteries (which measures about 12VDC unloaded as I recall).

Building one, while not impossible, would certainly be a home science project.
I would tend to agree with the previous responder...these charger are widly available on E-bay for a reasonable cost.

Best regards, Hal


#5

Widely available on Ebay? Not that I've seen.

I'm searching for a couple of these myself and haven't seen one offered alone in a week and a half.

They are offered with a classic HP, but I haven't found them solo.

?

Gene

#6

The article forum contains the schematics for the charger:

Tony D.'s article

#7

Building the electronics is fairly trivial... building the connector is not. Bite the bullet and either buy one on Ebay (hint, it is often more cost effective to buy a classic with charger than a bare charger. Warning: a LOT of chargers have damaged connections in the molded rubber plug) or else charge the batteries external to the calculator.


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