DIY Guitar Pedals Oil Tanker Fuzz, Инструкция по эксплуатации, Страница: 18 / 29

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6.1 Output EQ Curve.
In regards to the output capacitor of C3, changing the volume pot from a 500K resistance pot to a 100K resistance pot
changes the high pass filter response. For example, changing C3 from 100nF to 10nF and changing the pot to 100K will
give a much higher cut-off, making the sound brighter.
fc = 1 / (2 π RC )
fc = 1 / (2 π
⋅
R
volMAX
⋅
C
3
)
fc = 1 / (2 π
⋅
500 K
⋅
0.1 uF )
fc = 1 / (2 π
⋅
500,000
⋅
0.0000001)
fc = 3.2 Hz
This basically starts cutting out the low frequencies below 3.2Hz, which basically is just cutting out DC noise from leaving
the pedal and going into the next, which is a good thing. However, all the bass and sub frequency bass will leave the
pedal if above 3.2Hz
So, using a 100K volume pot and 10nF C3 cap:
fc = 1/(2 π RC )
fc = 1/(2 π
⋅
R
volMAX
⋅
C
3
)
fc = 1/(2 π
⋅
100 K
⋅
0.01 uF )
fc = 1/(2 π
⋅
100,000
⋅
0.00000001)
fc = 160 Hz
Now, frequencies get cut under 160Hz, still protecting the next pedal from low frequency DC noise, but also cuts a lot of
the bass out of the exit of the pedal.
The C2 capacitor shunts part of the signal to ground, but its value is so high (22uF) that in the worst case only signals
below 7Hz (and the audio spectrum) will be affected, so the contribution for the general frequency response can be
discarded.