HP-29C now has dots across the display...

[BobVA]

(09-02-2024 05:57 PM)Geoff Quickfall Wrote:  Can any one else do the test?

What won't I do for science? :-(

Blinking dot at 2.33v, then lights out shortly after, no other display artifacts. If I crank up the current limit it will stay on to lower voltage (less than 2.00) but the current draw goes up alarmingly (160 mA is where I quit, for fear of damaging the 29's power supply), so exactly how low it could go is up for speculation. Practically probably not of much interest, since I doubt AA's could produce that amount of current if they were dropping in voltage.

Keeping the voltage constant at 3.00 and lowering the current limit resulted in a hard cutoff at 123 mA. I might have seen a string of decimal points across the display once when that happened, for a split second. Perhaps some edge interaction between the multiplex circuitry and the low voltage warning?