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ElectroDuende · (This post was last modified: 11-13-2016 09:05 PM by ElectroDuende.)

(11-10-2016 02:18 PM)jebem Wrote: Hi!

Did you manage to progress on this display issue?

I'm planing to acquire my first Spice machine and considering the high prices asked for "untested" ad "sold as is" items, I'm afraid of getting one specimen with exactly the same issues.

As a side note, I found a picture of a "modified" HP-32E machine using 3 x AA battery cells for a total of 4.5Volt.

Cosmetically considerations aside, for a machine designed to operate with 2.5VDC at most, applying 4.5VDC is kind of power supply stressing, and I'm not sure about the LED operation.
Do you know if the LED module power lines are coming directly from th battery supply bypassing the regulated dc-dc power supply?

Here and here.

Hi Jose,

No, I'm afraid that all Spices that I had lately monitored on Ebay have finished too much expensive for me (even dfective models). I'll keep on waiting...

Regarding that mod, it is strange; the guy states "since the output voltage from the original rechargeable battery was 4.2-4.7 volta" but that is a bad asumption; as we all know here, they use 2x NiCd, that will be 2.4v (maybe he read about classic models and mixed things up).

And sorry, I have no idea if the power for the LED display comes from the DC-DC converter or directly from batteries... but I suppose it comes from the converter, as the brigth is quite constant during all battery life (although I use NiMH in my HP34C, and they have quite a flat discharge curve).