The Uh-Oh Battery Level Indicator Kit can help prevent these frustrations. ... we must consult the schematic for the Uh-Oh Battery Indicator and the datasheet for the TL431. ... Note that the R1 and ...

When the battery voltage is above 5.1 volt, zener provides regulated 5.1 volt to pin3 of IC and its output goes high to light LED. It indicates that battery is full. If the voltage in the battery ...

Isn’t it always the way? There’s a circuit right out of the textbooks, or even a chip designed to do exactly what you want — almost exactly. It’s 80% perfect for your applic… ...