Hurricane II: An HP-41C Battery Pack w/ USB

[Hans Brueggemann]

(03-15-2021 04:23 PM)wbvreeuwijk Wrote:  As my HP-41CL, needs constant recharging I'm very much looking forward to you making this available to a broader audience. Are you planning to make the schematic available or selling the charging/converter circuitboard?

i'm thinking to make all design files freely available to the hpmuseum community for private and non-commercial use.

from your post today it sounds like you actually know what a soldering iron is. ;o)
i haven't fully finalized testing yet, but results look promising so far. so, if you don't mind DYI assembly and would like to give it a test drive, drop me an email, and i'll be sending you the preliminary design files.
it would be really great to have somebody else testing it before releasing the final version into the public!