HP-65 more on the card reader

[teenix]

(02-13-2019 04:31 PM)wallyt Wrote:  Alberto and I are following a parallel course! I have an HP65 that will read/record fine as long as the NiCd battery pack does not have a full charge. Below 4V it seems to work really well. If I charge the pack so that it is above 4V the card reader is non-functional. Also, If I use a pack that has three disposable AAA lithium batteries the reader will not work. This pack is around 4.5V to 5V.

For those using an external supply with clip leads is it possible that there is a voltage drop from the leads and this allows the reader to work? It would not be much of a drop but maybe the sense amp is really sensitive.

You'd reckon a sense amp would be more sensible about things :-)

cheers

Tony