cut control question
Moderators: pompeiisneaks, Colossal
cut control question
sometimes the capacitor connects to the middle leg of the POT. sometimes it connects to the opposite leg to the other lead. what purpose does that serve?
-
Super_Reverb
- Posts: 188
- Joined: Tue Dec 21, 2010 6:28 am
- Location: Indianapolis, USA
Re: cut control question
Two ways you can connect your variable resistor on a cut control.
A cut control is adding a high frequency corner based on f=1/(2*pi*R*C) To control the corner frequency, you are varying the resistor value, so you have to connect between one end of the resistor and the wiper (center lug on most pots)
You can also short one end of the pot to the wiper and connect the two terminal variable resistor, you just created, in series with the cap.
Difference between the two is: in #2, you are shorting the "unused" portion of the pot. Do you care? The cut control doesn't care.
Strictly speaking, pots are three terminal variable resistors used as a variable voltage divider and a rheostat is a two terminal variable resistor, so in the case of a HF cut control or as part of some tonestacks, the variable resistors (pots) are being used as rheostats.
rob
A cut control is adding a high frequency corner based on f=1/(2*pi*R*C) To control the corner frequency, you are varying the resistor value, so you have to connect between one end of the resistor and the wiper (center lug on most pots)
You can also short one end of the pot to the wiper and connect the two terminal variable resistor, you just created, in series with the cap.
Difference between the two is: in #2, you are shorting the "unused" portion of the pot. Do you care? The cut control doesn't care.
Strictly speaking, pots are three terminal variable resistors used as a variable voltage divider and a rheostat is a two terminal variable resistor, so in the case of a HF cut control or as part of some tonestacks, the variable resistors (pots) are being used as rheostats.
rob