hi, i have a bunch of potentiometers, but not the values I need. can i add regular resistors in line with a 100k pot to get close? or, should i just use a pot that's way bigger, like a 1meg pot?
i can't find it online. it's the stepped tone generator from the forest mims 555 book. i believe these two 500k pots control the frequency of each of the 555s in the 556.
If you add other resistors, such as 400k in series with the 100k pot, you would only get a 5th of the range (400k-500k). Check the book to see if it gives more info on the range you need. If the range only needs to be a portion of that 500k, you could get away with a 100k and other resistors, you might lose some functionality of the circuit.