A strange behaviour when my classic calculator is connected to a wall adapter

[aurelio]

(04-21-2020 04:59 PM)Geoff Quickfall Wrote:  I am with Bob on this. The adapters contain a large electrolytic if I am not mistaken. That electrolytic cap is around 45 years old and those adapters do get warm when used. It is probably failing open.

Geoff

I did not consider it, it means that usually the drop of voltage when the plug is connected to the calculator is lower than 300mV, 'cause the second adapter supplies with the open-circuit 5,3V.
I'll open the adapter searching the electrolytic, so.
I'll report.
Thanks to all