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HP Classic Series Display Driver
11-10-2016, 11:05 PM
Post: #13
RE: HP Classic Series Display Driver
(11-10-2016 10:31 PM)Hans-Peter Wrote:  Hi Harald

It seems to be a very interesting project, not just a display driver (more a calc driver:-).

When I started this thread it was about the original display drivers. Now it has become about a cpu board replacement for the classic series calculators. I will probably start a new thread once the board is fully working.

(11-10-2016 10:31 PM)Hans-Peter Wrote:  I have a non working HP65. There are only two segments shining.
Is there a chance to give him a new life with that Project?

That depends on what the problem is. If there is a problem with the anode or cathode drivers, I don't have a replacement for those,
If it is the main PCB, theoretically I could make a replacement PCB for that. The HP65 has a smaller PCB than the 35, 45, 70 and 80. So this would be a new design. But it wouldn't be possible (at least I would not know how) to use the card reader.

(11-10-2016 10:31 PM)Hans-Peter Wrote:  Where is now the powersupply on the new board?

The power supply is the little 5 pin IC next to the connector and the capacitors around it. This generates the supply voltage for the display driver. The two controllers run directly off the battery.

(11-10-2016 10:31 PM)Hans-Peter Wrote:  Best regards

Best Regards,
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HP Classic Series Display Driver - Harald - 08-31-2016, 01:41 PM
RE: HP Classic Series Display Driver - Harald - 11-10-2016 11:05 PM

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