I build my 3 IotaWatt with standard 5% tolerance through hole resistors. (i think 5% had them lying around in a big bag - could als be 1%)
I was wondering if changing them to 0.1% would improve it (not that i’m complaining when i made them i measured between 100 and 104W for a 102W lightbulb )
Since i am using SCT013-030 the resistors over the CT aren’t there.
So there are 4 locations left
- the led: quite sure the tolerance doesn’t matter here
- the voltage devider on the VT: i guess that it isn’t very important to have low tolerance here
- the vref shunt: unsure, maybe this is important?
- the LM358: unsure, maybe this is important?
The reason i’m asking is to know if the time and money (ok, 0.6euro per resistor isn’t that expensive) is worth it?