Capacitor smoothing question

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Mixtel90

Guru

Joined: 05/10/2019
Location: United Kingdom
Posts: 8894
Posted: 10:56pm 09 Mar 2025      

To measure the capacity of a cell you really need a constant current load. You can cobble something together. This might be worth a try.



                  +---------- 5V
                  !
  +--------+     ---
  !        !     330R
-----      \     ---
 ===        \!    !
  !      NPN !----+
  !         /!    !
  !       e/      !
  !        !      !
  !        !      !
  !       ---    ---  \ Red
  !        R     \ / -/ LED
  !       ---    ---
  !        !      !
  +--------+------+--------- GND

R = 1.2/I


Now the current won't depend on the cell voltage as much.