WP34S USB and IR board release

[Harald]

(04-10-2017 06:14 PM)c785 Wrote:  Harald, I'd love to have a DIY set, as I wrote earlier, but I'm also very interested in the LiPo-capable version. Do you still have boards of that type, and can you offer the parts for that (including the diode to replace one of the inductors on the mainboard) as well?

Reason: Since receiving my HP30b last week, the second pair of CR2032s is starting to flash the battery symbol. I'm not doing numerical integration of matrix determinants around the clock, just trying to get to know the calculator a bit. I'm quite worried about battery life. Or is my unit bad? I can remember hacking a HP20S quite a lot for months without worrying about the battery, and even the HP48 didn't eat batteries quite as fast as this (until I started computing Mandelbrot fractals, that is).

The 30b draws quite a bit of current when it is running. If you are just number crunching it is mostly idle, but when you are running programs the processor runs constantly. So I don't think there is anything wrong with your machine.

I have none of the Li-Ion boards left and kits aren't possible either. I am not very proud of the design as it needed selected LEDs as zener diodes.
If you go for one of the USB IR boards you can power the calculator from the USB port (a USB charger will work as well) and save battery that way.

Cheers,
Harald