DIY Guitar Pedals Oil Tanker Fuzz, Инструкция по эксплуатации, Страница: 25 / 29

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9. Modifications
Following is a couple of worthwhile modifications that can be applied to the Oil Tanker Fuzz.
9.1 Capacitors
Changing the values of C1 changes what frequencies that get passed into the pedal. Making C1 smaller amplifies less of
the lower frequencies, while increasing C1’s capacitance will allow more bass into the pedal. At 100nF, frequencies
above around 33.8Hz get through.
Changing the values of C2 changes what frequencies get amplified in the fuzz creation. Making C2 smaller amplifies less
of the lower frequencies. At 22uF, frequencies above around 7.2Hz get amplified.
The output capacitor C3 blocks the DC level from saturating any device following the Metal Oxide Fuzz. It creates a high
pass filter together with Volume Pot Resistance that will determine the lowest frequency that gets out of the pedal.
Making C3 smaller will let less low harmonics out. At 100nF, frequencies and harmonics above 3.1Hz are allowed to pass.
On the tone circuit, C4 and C5 effect the range of the tone potentiometer. C4 defines the upper boundary of the tone
knob and what frequencies and harmonics are cut out. Increasing its capacitance value will decrease the ceiling of upper
frequencies allowed, keeping more of the bass and less treble on the “bright” end of the tone knob. Decreasing the
capacitance of C4 to 1nF, for example, will allow more of the upper frequencies to pass on the “bright” end of the tone
knob.
C5 defines the lower boundary of the tone knob and what frequencies and harmonics are cut out. Increasing its
capacitance value to 470nF, for example, will decrease the floor of lower frequencies allowed, keeping more of the bass
on the “dark” end of the tone knob. Decreasing the capacitance of C5 will reduce more of the lower frequencies to pass
on the “dark” end of the tone knob.
For a wide sweep on the tone potentiometer, change C4 to 1nF and C5 to 470nF.
9.2 Potentiometers
In regards to C3 and its high pass filter, changing the volume potentiometer down to a 100K pot will change the value of
what frequencies will be filtered. By decreasing the pot to 100K, the sound becomes brighter as it will begin to cut more
of the lower frequencies and harmonics. For example, changing C3 to 10nF and the pot to 100K, frequencies and
harmonics above 160Hz are allowed to pass. Also reducing the value of the pot will improve output impedance.
To remove more of the higher frequencies to make a darker fuzz, decreasing the tone potentiometer’s resistance from
10K down to 1K will cut more of the frequencies above 1 kHz. This may be desired for a bass fuzz.