Persamaan Tr C828 Series Resistor Is

If they see a buffer at the input, they tend to sound awful.

It produces a characteristic high distorted sound called fuzz.

Ivor Arbiter took the round shaped enclosure idea from a microphone stand and it was the first pedal including a DPDT stomp-switch.

The effect became very popular because Jimi Hendrix played it and there were not many distortion pedals around at that time.

During its lifetime the pedal went through some minor cosmetic but major sonic changes.

In 1993 Dunlop took over the production selling the fuzz face in different flavors.

The earliest ones were Arbiter-England, then they became Dallas-Arbiter England sometime in 1968 since then there have been a variety of words in the smile.

I think the Arbiter-England one didnt use the NKT275 germanium transistor; in those days we used the AC128.

Cornell explains why the production switched to the modern, temperature independent, cheaper and stable silicon transistors like the BC183L, BC183KA, BC130C, BC108C, BC109C, BC209C, and BC239C.

Germanium transistors tend to have high leakage current and an inconsistent gain value.

This gain variation is crucial in the design, the best match uses a low gain in the first stage (70-80 approx.) and a high gain in the second stage (110-130 approx.).

However, there are some other options, for a more compressed sound you can use 90-120 for Q 1 and 150-190 Q 2.

There are some circuits that help to measure the transistor gain.

It can be broken down into three parts: Input Stage, Output Stage and Feedback Network.

The last block (the Feedback Network) will affect the rest of the analysis because it will influence the most important parameters: voltage gain, input impedance, output impedance and frequency response.

In the picture below you can see the original enclosure (left) compared with the new compact Dunlop box (right).

The right side of the board have all the pads to attach the cables to the battery clip, jacks, potentiometers and the DPDT foot-switch.

If you want the see the AC128 PSpice simulation model, check the last part of this article.

It is not the ideal input stage for signal integrity but the best for simplicity and fast high gain.

The Fuzz Face has a very low input impedance that will change with the position of the R FUZZ potentiometer (between 5.2K and 8.4K in the simulation ).

So the feedback network has a negative impact on this parameter.

Persamaan Tr C828 Series Resistor Is

In other pedals with similar input stages like the one in the Big Muff Pi a series resistor is placed at the input in order to higher the impedance (at the cost of creating a voltage divider that reduces the available input signal ).

This is the reason why t hey do not respond well when they are placed after other pedals.

A practical advice is to put your Fuzz Face first on the pedal chain, just after the guitar.

The germanium transistor needs to see the inductanceimpedance from the guitar pickups.