i think i already know the answer, but...

[foxfire]

i'm looking to build an eh hog foot. i'm going to use this http://www.muzique.com/schem/mole.gif to do it. the only thing is i don' have the 430k or the 43k resistors for the voltage divider. i do have two 220k's though and a 33k. so can i change the divider to 440k and 33k?

[foxfire]

the answer is no. you could try 330k and 33k however. it's the ratio that is important, but your best bet is to get the correct resistors.

[petemoore]

  I used 47k / 470k, same ratio bumps the impedance <1/2 a notch.

[foxfire]

i'm still learning about input impedance. so is it better to be a bit high or low?

[MartyMart]

47k/470k here too .... no problems
MM