juz_ad
Full Member level 2
Two fiddly voltage divider questions...
In the standard 2x R Voltage Divider you can change the values of the resistors around and still get the same Vout as long as the ratio between them is the same: e.g.
To get +2.5V from +10V I can use a 3K:1K combo, a 300R:100R combo or a 30R:10R combo...
1) In general use - is there a reason to choose larger R values over smaller ones? Is there a point where noise or current draw becomes an issue with bigger or smaller resistors?
2) Is there a best practice for putting the larger value or the smaller value as the Resistor to Ground? I'n asking this one because I have a circuit breadboarded at the moment with about a half dozen Rx voltage dividers - all with 100R resistors to Ground and I'm starting to worry if that's potentially a lot of signal leaking into Ground... or maybe I just worry too much
:???: Thanks.
In the standard 2x R Voltage Divider you can change the values of the resistors around and still get the same Vout as long as the ratio between them is the same: e.g.
To get +2.5V from +10V I can use a 3K:1K combo, a 300R:100R combo or a 30R:10R combo...
1) In general use - is there a reason to choose larger R values over smaller ones? Is there a point where noise or current draw becomes an issue with bigger or smaller resistors?
2) Is there a best practice for putting the larger value or the smaller value as the Resistor to Ground? I'n asking this one because I have a circuit breadboarded at the moment with about a half dozen Rx voltage dividers - all with 100R resistors to Ground and I'm starting to worry if that's potentially a lot of signal leaking into Ground... or maybe I just worry too much
:???: Thanks.