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发表于 2011-9-11 18:00:29
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 Arbiter Fuzz Face
The Fuzz Legend
Welcome to a legend. The Dallas-Arbiter Fuzz Face has been around since 1966, and it shows no signs of dying any time soon. Through this design's past you'll find all kinds of different variations in the basic original circuit, from PNP Germanium to NPN Silicon, and a countless number of fuzz pedals that are based on it. One of the most notable Fuzz Face-based distortion pedals is my personal favorite...the Sola Sound ToneBender MKII. The Fuzz Face has been played by almost every famous guitar player that has ever lived, and this trend will most likely continue for a very long time to come.
| What's Inside...The Germanium Years
I think that this pedal's longevity is due in part to its very simple design. There are four resistors, three capacitors, two potentiometers, and two transistors...that's it. The original resistors were 1/2-watt carbon-composition with a tolerance of ±10%. The input capacitor was a 2.2µF electrolytic axial lead. The capacitor from the wiper lug of the fuzz pot to ground was a 20µF electrolytic with axial leads. The 0.01µF capacitor that connected to the third lug of the volume pot was metallized polyester. The original versions of the Fuzz Face were equipped with PNP Germanium transistors. There were at least three types used: NKT275, AC128, and SFT363E. These three transistors are quite hard to come by these days. Beware of modern-day reproductions of the AC128 and NKT275. As for the SFT363E...I've never even seen one! The circuit board below has NKT275 transistors |
Here's a schematic of the original Germanium transistor version of the Dallas-Arbiter Fuzz Face:
What's Inside...The Silicon Years
As time wore on, Germanium transistors were slowly being phased out in favor of the more stable and consistent Silicon versions. As a result, Dallas-Arbiter began equipping the Fuzz Face pedals with these new transistors with differing results. They do sound different from the original Germanium versions, usually with a more harsh and aggressive clipping as opposed to the "soft" clipping characteristics of Germanium. There was only one part that was changed in the circuit other than the transistors. The 470-ohm resistor was replaced with a 330-ohm. Also, take a look at the picture of the Silicon Fuzz Face circuit board below. Notice that the position of the 33K and the 330 resistors are opposite of what they are in the Germanium version. The 470 was in the center in the previous version, but now it's moved to the outside next to the 20µF capacitor. The transistors that were used in these versions included: BC108C, BC183L, BC109, BC109C, and BC209C. Most, if not all, of these transistors are still being produced and are readily available. A while back I ordered some BC108 and BC109C from Futurlec, but I don't recommend them as a supplier because of their painfully slow shipping. The circuit board below has BC183L transistors, which have the B-C-E pinout. All the other transistors that were used have the more standard C-B-E pinout, so if you run across a Fuzz Face with something other than the BC183L, the base and collector leads will be twisted around to work properly.
以上是转帖国外的一个改装资料。就是把PNP改为NPN.。很简单，可以照方抓药。改装后可以使用内负外正的一般的单块电源了…… |
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