yougarage
Member level 1
I'm going to read (with an ADC) an analog signal.
I scale it down from 20v to 5v using a voltage divider, but I'd like to protect the adc pin from overvoltages.
right after the divider,is it better a small zener rated at 5.1 volt to ground, or a simple signal diode (like 1n4148) connected to regulated 5v ?
Which of them could affect less the linearity of the readings?
I scale it down from 20v to 5v using a voltage divider, but I'd like to protect the adc pin from overvoltages.
right after the divider,is it better a small zener rated at 5.1 volt to ground, or a simple signal diode (like 1n4148) connected to regulated 5v ?
Which of them could affect less the linearity of the readings?