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HP-25 internal Power Circuit Charger



#5

Hi all,

Could anybody bring me the HP-25 internal power circuit to charge NiCd batteries? I know is a little bit dangerous to charge batteries inside the machine (I put already the Zenner between contacts), this is the reason why I would like to make an external battery charger using the original HP AC adapter.

Thanks in advance,

Albert


#6

Sure. The chearger circuit is very simple, it consists of 4 components in series. They are :
The AC adapter secondary winding; A diode (try a 1N4007 or similar), a 8.2 Ohm resistor (looks to be at least 1W, maybe 2W), and the NiCd pack. The diode's cathode (banded end) goes towards the +ve terminal of the battery.
That's it. The actual 'reserve power pack' is a bit more complicated as it has an LED to indicate the batteries are on-charge, I can dig out a schematic of that if you like.


#7

Thanks a lot, I'll try to find out the components and a single-layer circuit.

Albert

#8

I think they just put the LED/current limiter resistor across the 8.2 ohm resistor. Thats what I do when I modify Woodstock corpses to be external chargers.


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