Re: Repairing HP82066B charger Message #5 Posted by Timo on 8 Jan 2011, 11:37 a.m., in response to message #4 by Paul Berger (Canada)
Thanks for all the very helpful answers!
Paul:
What I meant was that I checked the AC output at the cord when the adapter was pluged into a 230VAC receptacle. I did not measure any voltage there so I'd say it is dead.
I wouldn't consider myself someone with a very good background in electronics. I do know a bit more than basics though (at least I can recognize the hot end of the soldering iron when I see one, so to speak ;)).
So summing up your answers it seems, that building a "self-made" AC adapter for the battery pack sounds quite managable to me. I checked the datasheet of the 78L12 here and the recommended operating conditions are an input voltage of 8-20V. So a simple AC source with a voltage of approx. 15VAC as you recommend should work indeed. Maybe a fuse to limit the output voltage of this adapter in order to protect the battery pack circuit would come in handy as well...
However, I do have some colleagues at work which are really knowledgable when it comes to electronics, so I will try and show them the battery pack circuit diagram. Maybe they have some additonal inputs as well.
I'll give you some feedback once (and if) we've found a workable solution. In the meantime thank you very much again for your replies and best regards!
Timo
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