I have seen in several schematics where a precision resistor, or matched resistors are called for, but every one of them talk about you going to purchase special resistors for this purpose.
I am building the Go, No-go transistor matching circuit shown here. It stated the just about all the resistors have to be matched to 1% at the most for it to work. I have cheapo "1% resistors", but don't trust them to be in spec. For this particular circuit it would seem that the closer I can get to precise resistances, the more accurate the vbe measurements will be.
Question: do I really need to find resistor "pairs" for this or can I simply put resistors in series until the total resistance is exactly what I want (my 20000 count multimeter would let me get to 0.1% or even 0.01% precision this way)? So for example, to get a perfect 20k resistor, I might use a 15k, 4.7k, 270 and maybe something small between 1-100 ohms all in series so that the total real resistance measured is 19.999-20,001 ohms. It seems like a simple no brainer, but every time I see schematics talking about precision resistors, none of them offer this approach, which got me to wonder if there was a reason.