Fairchild application note resistor values

[argintviu]

Hello! I am interested in building the curve tracer from AN6610 by Fairchild (https://www.onsemi.cn/pub/collateral/an-6610cn.pdf) and I was wondering about the resistor selection for the 10V and -10V references for the A4 op amp. These voltages are generated with the 499R + 1K (+10V) and with the 499R + 1k + 750R (-10V) dividers.

I was thinking of using SMD resistors, but since the values of these resistors are small, I'm afraid the resistors will burn or heat up too much and drift. Is there any special reason to why the author has chosen such small values? Lower noise maybe? Could I change them to something bigger to minimize dissipation? Any suggestions for a range?

Also, what's the purpose of the 10R resistors that go to the drain of the DUT? Could they be omitted?

[Vovk_Z]

Dissipated power is I*I*R, or U*U/R.

[Vovk_Z]

You may successfully use two 1k resistors in parallel instead of 499R, and two 2k instead of one 1k - and everything will be fine with power dissipation if you are afraid of it.

[argintviu]

Thanks for the input!