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Ale · 02-14-2006, 07:24 PM

Quote: Originally Posted by Vicne

What if I used an offset instead of a resistor divider ?

I think that if the spikes are so high they can pass the divider, the drop of 2,5V without the divider isn't enough. Or the spikes aren't so high but enter from the gnd pin of max232, if this is the case it is better to filter with the 10 uF capacitor near V+ and GND pins. Or try adding another 33K resistor connected between rx pin and V- of charge pump (-5V).

02-14-2006, 07:24 PM	#88
Ale Newbie Join Date: Feb 2006 Location: Italy Posts: 42	noise Quote: Originally Posted by Vicne What if I used an offset instead of a resistor divider ? I think that if the spikes are so high they can pass the divider, the drop of 2,5V without the divider isn't enough. Or the spikes aren't so high but enter from the gnd pin of max232, if this is the case it is better to filter with the 10 uF capacitor near V+ and GND pins. Or try adding another 33K resistor connected between rx pin and V- of charge pump (-5V).