LTSpice Fuzz Face Model .

LTSpice Fuzz Face(效果器, 變音器 ) Model
        I was playing around in LT Spice Model of the famous Fuzz Face pedal circuit.
The circuit is brilliant in its simplicity. The first transistor in the signal path is biased as a high gain amplifier that feeds the base of a second transitor which provides a voltage feedback to the base of the first transistor.   Note that the transistor model I used is suppose to be similar to those old germanium ones used back in the day.  I can’t really vouch for these models though.  I found them somewhere on a forum so the origin of the models are somewhat nebulous.


      This is a pretty easy circuit to start with if you interested in putting together your own pedals.  You can built this circuit youself in a few minutes with some old parts you may have laying around.  If you don’t have these sort of parts laying around you will soon be able to buy them in the Electric Chili store.
Take a look at the output waveformbelow.  It almost looks like I just generated a square wave.  It has a solid pattern which is good musically.  We don’t want anything that’s a hot mess because it’ll sound like crap.

        Check out the FFT below. The blue sinewave is the simulated input. You can see that the input isn’t modeled as a perfect sinewave but that’s OK. We’re unlikely to get a perfect sinewave out of guitar. In face, if we did, we would hate the sound. It would be pretty darn annoying.  The Blue wave is the output of the circuit.  You can see that it sustains many of the high frequency signals.  This makes sense because of the hard edges on the waveform.

         The model is set up so we can see different pot settings can be evaluated at the same time.  Pretty slick eh?  Here’s a copy of the model itself so you can play around with it yourself.  Change the resistor and cap values and take a look at how it affects the output.  Throw a diode in a strange place to see how if affects the signal.   A tool like this is a great way to learn about how analog circuits work so if you haven’t downloaded LT SPice, you should Google and get it!

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效果器
效果器是一種可以令電子樂器或音訊的音色加以修飾的電子器材。效果器常用於電吉他、電子琴或電貝斯上，也有少量設計予原聲樂器和聲樂的效果器。效果器一般連接於樂器的音頻線路之中，使用者透過改變效果器的設定，單獨使用或作出不同的組合從而得到無限的可能性，改變樂器的音色。他們可以在實時演出或進行後期製作時使用。

分類
效果器分為不同的種類，分別為俗稱「地雷」的單塊效果器、綜合效果器和機架式效果器。單塊效果器的外殼一般為塑料或金屬，以一個或以上的腳踏控制開關，置於地上供樂手即時使用。這些單塊效果器通常只會內置一至兩種的效果。

綜合效果器分為地面式和桌上式，地面式的綜合效果器以腳踏操控，方便於演出時控制。桌上式的綜合效果器則以不同的旋鈕控制。綜合效果器內藏不同的效果和組合，大部份可以編程和內置大量的預設效果。

機架式效果器可以組裝於19吋機架上，提供專業級的效果。它們可以只藏有一個或數個的效果，也可以內藏大量的效果和組合。在前面板上，有不同的按鈕和旋鈕控制，更有部份機架式效果器可透過MIDI樂器數碼介面控制。

現代更出現了可以安裝於個人電腦中的虛擬效果器，透過VST、RTAS、Direct X等軟體介面和音效卡等硬體介面連接樂器，利用電腦模擬效果器和放大器的電子線路。

原理
使原有輸出波形發生失真，從而改變頻率與音色。