skeptical buffer eq switches

[EthanRoppBass]

What exactly are the boosted frequencies for each switch on the skeptical buffer? And, if I wanted to change those frequencies to be more suitable for bass, which resistor/capacitor values would I change?

 

[BuddytheReow]

You can calculate each of them using the corner frequency formula. = 1 / (2*pi*R*C). You’ll need to identify where parallel resistors are being used. Google will help explain the formula. Sorry, I just woke up and don’t feel like doing math

 

[EthanRoppBass]

Nah I dont mind doing the math, I'm a physics major. I just wasnt sure which resistors I would need to swap out.

 

[BuddytheReow]

Each switch turns on/off a different corner frequency in either opamp in the screenshot below. I highlighted R6 since you will need to take that into consideration when calculating the corner frequency (they are parallel resistors here for the first two switches). Keep in mind if you change R10 you will also change the gain structure of that stage: if you increase the value you will decrease the gain and vice versa.

 

[EthanRoppBass]

Thanks!

 

[m4268588]

SW_L boosts 106Hz by 3.5db (exact!).
SW_B is 516Hz.

It is not easy to know the corner frequency of SW_H, but it boosts more than 5kHz..
See this calculator.(R9 and R7 can be deleted and analyzed because the impact is minor)