Questions tagged [undervoltage]

Here is schematic of battery charging circuit. The battery voltage at 100% charge is 4.2V and it gradually decrease and is 3.2V, discharging below 3.2V will affect the battery life. How to make sure, the battery supply is disconnected automatically…

Circumstances : The power supply to our home is faulty and runs very low. Sometimes as low as 138V, most of the time 170V, but never 220V as it should. (We are in South Africa) Sometimes the UPS from my computer alarms like when there is a power…

I was fooling around with a DFPlayer Mini MP3 player, which looks like a really nice and easy to use device. For some reason I couldn't get mine to output sound on its speaker outputs, so I decided it is faulty. But it did output fine on its line…