3 ms·
I'd say if you need more than E3, you either know a lot of not much, unless you're into analog. I've done stuff that needs high precision resistors, but usuall
by eternityforest 2y ago
I'd say if you need more than E3, you either know a lot of not much, unless you're into analog.
I've done stuff that needs high precision resistors, but usually the specific value isn't that important, just that it's a known repeatable value.
- nick238 2y agoIf I want a voltage divider, it's a lot easier to just use some 1% resistors and forward-calculate the expected output (rather than doing a calibration) if you're happy with 1-2% error from the resistors and your ADC or the like. Adding software and testing hardware to do a full on calibration is a lot of work. But yeah, for digital signals, oft times 1k or 100k make no difference.
- willis936 2y agoFor voltage dividers it's best to use matched networks. Often not much more expensive and orders of magnitude more precise.
- eternityforest 2y agoI definitely agree that 1% or better resistors are easier than calibration, but that doesn't mean you need values outside of E3 most of the time. I might want want an accurate 1/10 divider or something, but a 1/12 divider would probably be fine too, as long as it's consistent. If it doesn't vary between devices, it's just a line of code to change.