HP-67 Card Reader became very touchy

[Alevin]

(09-29-2023 10:32 PM)teenix Wrote:  The smallest 47uF looks to be about 6mm diameter with a 6.3V rating. Since the battery supply is under 4V, this should do.

cheers

Tony

Thanks again for the advice.

In the one hand, as it was metioned the 16-25 volts in reference to the power line capacitor in the HP-97, I assumed the same voltage specification for the HP-67.

In the other hand, Hp-97 is plenty of space to accept a 9 mm dip cap. Indeed the one I have got has exactly the same circutry lay out than in the pic you shown above, in a previous post.

Regards