fuzz face bias

The Fuzz Face Models. The value usually does not get as low as -5.5dB, the series resistor of the battery should be taken into consideration and will raise the output level. Post by DrNomis » 03 Jan 2014, 15:42. polifemo wrote:Messin' … 6 = 3dB) all frequencies below 14Hz will suffer an attenuation 6dB/oct. Note that the output signal is not completely flat when it clips (it is slightly tilted), this feature adds more character to the sound . 1.1 The transistors.2. It can be broken down into three parts: 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. 1. We want to take a moment here to explain how you can do this on your own for both the kit version and completed versions. The fuzz is not designed to overdrive the following. The plot below represents the total frequency response of the fuzz face, the different lines show the effect of the volume potentiometer. Fuzz Face Original Version (PNP) Components To use a PNP Fuzz Face with a normal 9V power supply, you need to include the power inverter section which is C1, C8, C9, D1 and IC1 which is generates the -9V required. Who wouldn't like to tweak their Fuzz Face bias on the fly? THIS IS PNP / POSITIVE GROUND. 2.2 Components Part List / Bill of Materials. In this case, the total voltage gain measured at Q2 collector is around 19.5dB. You can read more about it in the Frequency Response section. that has grown up around them. Proper biasing of the Germanium transistors found in Synthrotek’s Fuzz Face clone and the Face the Fuzz pedals is essential to getting the best (optimal) tone out of your product. The voltage required is 4.5v. Dennis Cornell: "All the transistors worked in a very similar way and all did the job, but they did give a slightly different tone. Fuzz Face: bias vs voltage sag. I’m looking for pedal that works well both for leads and for rhythm. Fuzz Circuit Guitars Image Guitar Vintage Guitars. These are the most important DC bias points of the circuit.note: The input stage is a Common Emitter (Collector Follower) PNP amplifier, it provides a high voltage gain with low input impedance and high output impedance. 2.1 Fuzz Face Layout. Amplifiers use current or voltage as input or outputs, you can check the amplifier classification. My sincere appreciation for D.Clark support. and a high gain in the second stage (β=110-130 approx. Trademarks, brand names and logos are the property of their respective owners. It exhibits an attenuation in the low frequencies (high pass filter) with a fc=14Hz inherited from the input stage. Add to Wishlist. We have made two graphics below showing you how to do this for both the Fuzz Face clone (which powers off the negative rail), and our new Face the Fuzz pedal which powers off a standard 9V center negative supply and can be daisy chained with other 9V center negative pedals. Emitter degeneration capacitor C2:Any impedance between C2 emitter and ground (RFUZZ) will reduce the gain of the output stage, it is a form of local negative feedback. However, it can be considered as a bad output impedance, it is too high and can carry problems when it is placed in the pedal chain. The job of the feedback network is basically to reduce the huge gain of the Fuzz Face stages, making the whole circuit more stable and independent from problematic germanium transistors: The FF frequency response is shaped by the three capacitors C1, C2 and C3: \[f_{c}=\frac{1}{2\pi R C}=\frac{1}{2\pi \cdot Z_{in}\cdot  C_{1}}=\frac{1}{2\pi \cdot 5K \cdot 2.2uF}= 14Hz\], All harmonics below 14Hz will have 6dB/oct of attenuation, \[f_{c}=\frac{1}{2\pi R C}=\frac{1}{2\pi \cdot R_{vol}\cdot  C_{3}}=\frac{1}{2\pi \cdot 500K \cdot 0.01uF}= 31Hz\]. I decided to do it as an fixed bias for layout simplify and vintage look of sake of it. 2. If we take into consideration the feedback network, once again the second stage will not reach values as 18dB. document.getElementById('cloak0bbee1a085a5092a78cb1fa82c758b68').innerHTML = ''; Solar Face Fuzz Fuzz Who doesn't love a Fuzz Face? In the image below the voltage gain of the input stage is shown varying the fuzz potentiometer. It is not the ideal input stage for signal integrity but the best for simplicity and fast high gain. Fuzz Face Output Stage. , you are free to copy, share, remix and use all material. The gist of the Fuzz Face remains in the simple circuit that uses eleven components (2 transistors, 4 resistors, 3 caps and 2 pots) and the astonishing tones created with them; delivering a soft asymmetrical clipping that changes to hard clipping in both semi-cycles under the fuzz pot action. The fuzz face design was inspired in other contemporary fuzz pedals like the Maestro Fuzz Tone (designed by Glen Snotty) and the Sola Sound ToneBender (designed by Gary Hurst) although the Fuzz Face was an easier circuit than the competitors with only 2 transistors instead of 3. You need JavaScript enabled to view it. The 20uF is so big that almost all the frequencies get full amplification. Because the fuzz is so dependent on individual transistors there can be huge variation in the way these sound. Since both kits and completed pedals both come with bias tested transistors, you should not need to completely remove the electronics from the housing. Resources. 2.3 Circuit Bias Points.3. These days Dunlop manufactures a number of different finishes and sizes using various transistor flavors: The transistors are the most sensitive part of the design with a whole mythology that has grown up around them. AC128 Transistor datasheet 1 pdfAC128 Transistor datasheet 2 pdf. The trimmer resistor can be dialed in by ear to suit the desired tone if you so desire. 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. Vox Tonebender. The graph also shows a general roll off of the bass harmonics under 14Hz, this is due to the high pass filter created by C2 and Zin (input impedance of the pedal). Unless you know what you're doing and have a positive ground PSU, you should use all these components, otherwise omit them and solder a jumper between J1 and J2. It can be calculated as: For this math calculation the feedback network is ignored but in practice, it will lower the input impedance to 5KΩ approx. All you need to do is connect your leads to a ground on the PCB and the collector of Q2 to get this reading. This is due to the C3 output high pass filter effect ( C3 - RVOL). This is due to the C, The graph also shows a general roll off of the bass harmonics under 14Hz, this is due to the high pass filter created by C, Broadly speaking the frequency response of the Fuzz Face is not very innovative, it just removes some bass and keeps all the highs which contribute to have powerful distortion. There is some controversy of when and where the 2-transistor topology appeared: the Tone Bender MK1.5 is similar to the Dick Denney designed Vox Distortion Booster circuit, nearly identical to the Italian made Vox Tone Bender circuit, and the Arbiter Fuzz Face circuit. The effect became very popular because Jimi Hendrix played it and there were not many distortion pedals around at that time. var addy0bbee1a085a5092a78cb1fa82c758b68 = 'info' + '@'; Tabor. We audit all pairs in the classic Fuzz Face circuit, and we guarantee proper operation in that circuit and with the bias resistor values that we specify. var addyc9796beda9bd2381890082165b7e7805 = 'info' + '@'; In this video I will set the trimpots of my Dunlop Fuzz Face JDF2Hope you find it useful The voltage gain (AV) can go from 8.2 to as high as the transistor's basic internal gain (when RFUZZ is maxed out). In a Common Emitter transistor the voltage gain can be calculated following the equation: note: The gm value of a transistor is defined as: In the real life, the input stage will not reach 49dB of gain, the feedback network will reduce this levels to 18.6 dB approx. The input stage will first hit mushy saturation on one polarity of signal and then if driven hard enough, hit cutoff on the other polarity. There are two main possibilities: Germanium transistors are considered to have an overall better sounding to this effect with some drawbacks: germanium manufacturing is not as consistent and controlled as silicon and they have shorter lifespan and more temperature sensitivity. This is the reason why t, The above graph shows a high pass filter with a cut-off frequency of 14Hz (18.6 -15. In 1993 Dunlop took over the production selling the fuzz face in different flavors. Fuzz Face Input Stage. PSUs with electronically isolated outputs may work, but it’s not ideal, and many vintage and vintage-style Fuzz Face owners resign themselves to using batteries. The Fuzz Face low input impedance will load the guitar pickups. The Erupter contains only one Bias control, with the fuzz level internally dimed and the Volume pre-set to a universal unity level. Reply Delete (Pedal must be powered on). Fuzz Face Global Feedback Network.6. The circuit sounds excellent, and it still needs only one scarce part. The key to building a good fuzz face is ensuring that transistors are getting the correct voltage. Speaking of feedback, from my noodling with a Fuzz Face circuit in Multisim (electronic workbench/Pspice type of program) I found that lowering collector resistor resulted in extra current travelling through that path. Dallas Rangemaster Treble Booster Analysis, Time Manipulator - Arduino Delay/Echo/Reverb. Other fuzz pedals like the, Big Muff Pi have a more distinctive frequency response. It is a very simple two transistor design and they were originally germanium transistors. However, there are some other options, for a more compressed sound you can use β=90-120 for Q. It is important to select the right transistor from the whole batch in order to archive the best effect performance. Electrical Engineering Thesis by William E. Overton focused on the Fuzz Face. This is the reason why they do not respond well when they are placed after other pedals. This gain variation is crucial in the design, the best match uses a low gain in the first stage (β=70-80 approx.) Fuzz Faces naturally tend to bias with only about half a volt on the collector of the first transistor, so there is a lot of room upwards. Germanium transistors tend to have high leakage current and an inconsistent gain value. Image result for fuzz face bias pot. 2.2 Fuzz Face Components Part List / Bill of Materials: This is the reduced list of components needed to build a Fuzz Face: 1    C1:    2.2 uF1    C2:    20 uF1    C3:    0.01 uF1    R1:    33KΩ1    R2:    470Ω1    R3:    8.KΩ1    R4:    100KΩ1    Rvol:    500KΩ (Audio tap)1    Rfuzz:    1KΩ (Linear tap)2    Q1, Q2:    AC128     Jack in, Jack out, battery clip, DPDT foot-switch. Desensitize the gain: make the gain value less sensitive to transistors (i.e component variation caused by temperature). There are two main possibilities: Germanium transistors are considered to have an overall better sounding to this effect with some drawbacks: germanium manufacturing is not as consistent and controlled as silicon and they have shorter lifespan and more. The Fuzz Face Mini pedal line features legendary Fuzz Face tones in smaller, more pedalboard-friendly housings with several modern appointments: true bypass switching, a bright status LED, an AC power jack and a convenient battery door. T. he 20uF is so big that almost all the frequencies get full amplification. Today, both the, The earliest models were covered in red, light or dark gray Hammerite paint with the Fuzz Face logo in white or black, t, The transistors are the most sensitive part of the design with a whole mythology. It's the "middle" voltage, the spot where a waveform is centered on. Increasing this impedance will reduce the gain. Part of the output current is taken from Q2 emitter and introduced as current in Q1 base, so the feedback resistor R4 is shunt connected with the input and in series connected with the output. Thanks for reading, all feedback is appreciated. Discussion Paper About Fuzz FAce Batteries by DingoTone.com Arbitrer Fuzz Face by Fuzzcentral. It means that with low volume levels, the amount of bass frequencies of the signal are slightly reduced, making C3 bigger will let more low harmonics out. The single layer PCB with through-hole components fits without problems inside the oversized cast iron enclosure. For the best results with this PCB the transistor in Q2 needs to have the correct voltage for optimum performance. This analysis covers the first Arbitrer Fuzz Face model equipped with PNP germanium transistors from the first releases which are considered the best sounding. The Fuzz Face is particularly similar to the Sola Sound unit known today as the "Mk1.5" Tone Bender. Anyway, it's a nice circuit and definitely gives the Ge Fuzz Face's a run for their money. Go right ahead. Drives & Fuzz Kloned Centaur. For the bias values showed above, the fuzz potentiometer is set to the midpoint (500Ω), The DC voltages might change due to transistor, The important settings to get the best sound out of a Fuzz Face is to have Q1, For this math calculation the feedback network is ignored but in practice, it will lower the input impedance to 5K, load the guitar pickups. Completed builds: Dallas Arbiter Fuzz Face,Tone Bender Professional Mk 3,Tone Bender 3-Knob,Baja BK Butler Tube Driver,Baja Real Tube Overdrive,Roger Mayer Octavia,EH Soul Preacher,Tech 21 XXL Distortion,MFOS Weird Sound Generator. Reduce the noise: minimizing the contribution to the output of unwanted electrical signals. Although the core of the BOG is a modified Fuzz Face circuit, here we don’t like to stop where everyone does. The cut frequency of this HPFilter is: \[fc=\frac{1}{2\pi R C}=\frac{1}{2\pi \cdot R_{vol}\cdot  C_{3}}=\frac{1}{2\pi \cdot 500K \cdot 0.01uF}= 31Hz\]. In 1993 Dunlop took over the production selling the fuzz face in different flavors. PsPice models used for AC128 Fuzz Face simulation: .MODEL GERPNP_LOWGAIN PNP(IS=85.8N BF=85.000 NF=1.000 VAF=102.207 +IKF=9.981M ISE=0.435N NE=1.200 BR=20.000 NR=1.000 VAR=20.000 +IKR=1.248M ISC=120.8N NC=1.200 RB=173.312 IRB=5.000U RBM=43.328 +RE=20.000 RC=60.000 CJE=6.000P VJE=0.400 MJE=0.400 TF=0.150U+XTF=9.996 VTF=2.000 ITF=9.983M PTF=1.000 CJC=3.750P+VJC=0.600 MJC=0.330 XCJC=0.650 TR=2.865U+CJS=0.0 VJS=0.700 MJS=0.500 XTB=1.000 EG=0.670+XTI=4.000 KF=5.000F AF=1.000 FC=0.750).END, .MODEL GERPNP_HIGHGAIN PNP(IS=120.8N BF=120.000 NF=1.000 VAF=102.207 +IKF=9.981M ISE=0.435N NE=1.200 BR=20.000 NR=1.000 VAR=20.000 +IKR=1.248M ISC=120.8N NC=1.200 RB=173.312 IRB=5.000U RBM=43.328 +RE=20.000 RC=60.000 CJE=6.000P VJE=0.400 MJE=0.400 TF=0.150U+XTF=9.996 VTF=2.000 ITF=9.983M PTF=1.000 CJC=3.750P+VJC=0.600 MJC=0.330 XCJC=0.650 TR=2.865U+CJS=0.0 VJS=0.700 MJS=0.500 XTB=1.000 EG=0.670+XTI=4.000 KF=5.000F AF=1.000 FC=0.750).END. So, like all Deep Trip pedals, the BOG takes the usual 9V, center negative power supply, as most standard pedals do. The Fuzz Face. Quick View. The Technology of the Fuzz Face by R.G Keen.Fuzz Face Description by ScreaminFX. They are common technologies still easy to find nowadays. In the above image, the output voltage at Q2 is shown under the action of the RFUZZ potentiometer (the volume is set to max). Easiest To Use Fuzz Pedal. As the volume goes lower (blue line), the graph shows a steeper slope with more high content. Schematic diagram of a Fuzz Face adapted with a trimpot. For the Fuzz Face circuit to be optimally biased, the collector of Q2 needs to be at 4.5 volts. For component economy, the power supply does not include any capacitors to remove ripple from the power line which is something common in raw fuzz pedals. As the volume goes lower (blue line), the graph shows a steeper slope with more high content. In terms of design, the bypass capacitor C, All the frequencies over 8Hz get full amplification.
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