HP 65 with capacitor wired to battery terminals - why?

[EdS2]

(07-20-2021 04:26 PM)Hlib Wrote:  

Quote:Any idea how long an HP-65 would run from a 4700uF capacitor?

According to my approximate calculations, this time will be no more than 0.2_sec.
If this calculator consumes a current of 0.05_A at 4_V (I don`t remember exactly) and turns off at a voltage of 2.4_V, then it will be:
t=c×r×Ln(Us/Uf)=0.192_sec.
c=4700_μ, r=80_Ω, Us=4_V, Uf=2.4_V.

Yikes! Those big capacitors are really not so big. Thanks for the numbers.