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/BM/Normal it will be almost an octave pedal. /TK true var addy1596706def9b282fadcdd2f746892007 = 'info' + '@'; The FF circuit is rather simple: 4 resistors, 3 caps, and 2 transistors. /OPM 1 /Length 3022 P�����k���LWPlH0jC}E%c0Z���+����@Ճ!H���ʙKզ,� �+�E�r�j̰5/��|1��e�����"/���e7�j�u��4��Iz���?�n*2��UA�504(����̪��-L~��������'��m����H1����Ed�Լ Yet Another Fuzz Face.

/TK true

>> But then, when I started soldering, on a whim, I swapped out the transistors for a different model (making sure it was the correct type and in the proper orientation). 4 0 obj

/TK true 3 0 obj Rather, after the 2.2M resistor was added, my voltage read about 250 mV and 500 mV respectively, rather than the example 1.33 V. Is this the right way to measure the hfe in the first place? /BM/Normal beim Fuzz Face hängt der Sound zu einem Großteil von den HFE Werden der Transistoren ab und wie man die aufeinander matcht Das ist für einen guten FF Sound schon einmal die halbe Miete. By doing this, we will create the same conditions for the transistors as if they were the, The first FF's manufactured in the UK used the AC128, a 45-165 Hfe European germanium PNP transistor, cheap/common at that time (later on replaced by the Newmarket NKT275). /AIS false However, in order to reduce any excess of unwanted noise, two optional 100pF Miller capacitors (Cx) from base-to-collector on both transistors could be placed. Both current gain and leakage of a germanium transistor increase with heat. /ca 1 /Length 798 The Germanium Fuzz total voltage gain is around 48dB matching the simulation. I've had some success going as low as 40 or 45 hfe in Q1, and about 60-70 in Q2, but not lower. It sounded pretty nice on the breadboard. 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. The usual recommended range for the "classic" Fuzz Face is 70-85 for Q1 and 120-140 for Q2. endobj addy1596706def9b282fadcdd2f746892007 = addy1596706def9b282fadcdd2f746892007 + 'electrosmash' + '.' + 'com'; Leakage wasn’t particularly low in these transistors. The Fuzz Face Resistors: The original models use 1/2W carbon film resistors.

This kind of resistors was extensively used on vintage audio equipment. If you can, use a reverse log pot for fuzz level because all the magic happens in the last 20% of the pot travel. var addy6549dbb6511107e1a7730b7fcc304057 = 'info' + '@'; Many people think that original carbon resistors carry part of the organic fuzz distortion sound. hfe is nowhere near as important as you think it is. The first FF's manufactured in the UK used the AC128, a 45-165 Hfe European germanium PNP transistor, cheap/common at that time (later on replaced by the Newmarket NKT275). /SMask/None /OP false Someone in Aron's Stompbox Forum said that placing a 100pF capacitor … /CA 1 If you have a Cort guitar and a Crate amp, don't expect to sound like Jimi with a fuzz face. 10 0 obj There isn't any low pass filter in the circuit: in the treble side of the frequency response, the line extends flat to the limits of the measuring system. They are not used anymore because they are considered noisy compared to the modern metal-film resistors. After years of experimentation and listening, it is agreed that the best match uses a low gain in the first stage (Hfe=80 approx.) The originals were built without measuring anything. The original PCB from the 60s uses a single layer printed circuit board, will all the components placed on one side while the tracks run over the bottom.

Alpha potentiometers: Using reverse audio for the Fuzz control that gives extra control to the user. >> This caps will limit the high-frequency response of the pedal and keep under control the hissing noise. When playing with two Si transistors there are noticeable noise artifacts when note decays. /AIS false I used the method described here to measure the hfe's of the circuit, and I got about 25 for Q1 and about 50 for Q2. /CA 1 NKK 4PDT bypass switch. With Silicon it becomes very difficult to stick with the Q1 hfe of 70 and Q2 hfe of 120, because most Silicon transistors are way over 120 to begin with. Reverse polarity diode:  prevents battery reverse polarity damage. The Fuzz Face Caps: The original FF uses standard aluminum electrolytic capacitors for the 2.2uF and 20uF values and a film for the 10nF cap. We have created simple manuals to build this project: We also have a YouTube video that guides you during the whole building process: Note: The original fuzz uses carbon-zinc battery (not modern alkaline) and it is claimed to give a better sound performance. We also use third-party cookies that help us analyze and understand how you use this website. Hfe is always quite low in the NKT 275 Fuzz Face; few transistors if any exceeding 70 Hfe. Controlling the volume from the guitar can make the final tone from subtle crunch (10% guitar vol knob) to overload fuzz, On the left image, the most important bias points are VC1=-0.5 to -0.7v and VC2=-4.5V, these values, Instead of using the perfect and difficult-to-find transistors to get the circuit biased right, we can use almost any high-gain germanium PNP transistor (Hfe>50) and with the help of 2 trimmer resistors get the circuit perfect biased (right image). var path = 'hr' + 'ef' + '='; << /CA 1 /OP true

In the heat of summer or hot locations generally it is possible for a germanium Fuzz Face built in the temperate (i.e. Red high-brightness/low current LED that makes the total current consumption of the pedal 2.5mA. var addy_text6549dbb6511107e1a7730b7fcc304057 = 'info' + '@' + 'electrosmash' + '.' + 'com';document.getElementById('cloak6549dbb6511107e1a7730b7fcc304057').innerHTML += ''+addy_text6549dbb6511107e1a7730b7fcc304057+'<\/a>'; e-mail us at This email address is being protected from spambots.

/TK true Another reportedly good sounding original had a Q1 with Hfe in the low to mid 50s and a Q2 that measured c. 69 Hfe. 1 0 obj grey and soggy) UK to re-bias itself from an optimal point (and possibly even choke and stop working, or so I’ve read… I live in the too often sunless and soggy UK). /BM/Normal /Type/ExtGState It has an effect, but it's not completely crucial. 7 0 obj But not all the Fuzz Faces sound the same, in the old days, players sorted through dozens of pedals at a time to find the best sounding fuzz of the store. However, if you like a sound that's more "squishy" and "compressed," I have found that a high gain device for Q2 (150-190) gives a good result with a Q1 in the range of 90-120. Germanium Transistor Selection - Biasing the Fuzz Face: It is crucial to select the right transistors in order to archive the best sounding box. endobj Ge sound warmer and clips much softer than Si, producing somewhat hi-fi sounding distortion. It produces a characteristic high distorted sound called fuzz. stream >> Small variations should not make an appreciable difference to the functioning of a circuit.

if building a "high gain" ge fuzzface, you can go up to around 300hfe and be fine. Do we need another fuzz face derivative? Compiling all the knowledge and experience that we have nowadays about the Fuzz Face, we have designed this project that tries to bring the good old classic fuzz tone using modern and controlled technologies: The circuit schematic and Bill of Materials are available and open to modifications. It's interesting to see how the asymmetrical happens hapens first to the positive semicycle of the signal and how extremely distorted can get the fuzz output signal. endobj /SMask/None but it won't sound or react like a normal fuzzface. It’s kinda annoying. /ca 1 it will be almost an octave pedal. /AIS false 1/2W Carbon composite resistors: Same as the ones used in the original 1966 model.

I didn't use the recommended germanium transistors, but instead used some silicons that some people online recommended. /SMask/None These cookies do not store any personal information. Hi guys, do you know which transistors has Joe in his FF? Arbiter Fuzz Face The Fuzz Legend Welcome to a legend.

What transistor hFE(s) for a high gain Fuzz Face? /SMask/None << /OP true the fuzzface ccct really doesn't seem to care for high gain transistors, it becomes a run of the mill fuzz instead of the classic sounding face.

150 HFE and upwards for a germanium transistor sounds like the definition of 'high gain', regarding a germanium fuzz face that is...  You start gets significant distortion and a compressed sound. /Type/ExtGState Why is this? Necessary cookies are absolutely essential for the website to function properly. /AIS false X��WMO1�ϯ���2�6�η�]�eZz����N�*��W�%�"bP@KO]$NΔ��=����h��6�AbQXmd� n~�9Cr�5�1 >> Russian Germanium Transistors: For this project, we are going to use Germanium PNP transistors. var addy_text1596706def9b282fadcdd2f746892007 = 'info' + '@' + 'electrosmash' + '.' + 'com';document.getElementById('cloak1596706def9b282fadcdd2f746892007').innerHTML += ''+addy_text1596706def9b282fadcdd2f746892007+'<\/a>'; NOS Factory sealed Russian Germanium Transistors from the USSR era: with reasonable high-gain (Hfe>60) and super-low leakage current. Les meilleures offres pour 2x Neuf Tungsram Ac125 Germanium Transistor 70-80 Hfe Fuzz Face - Tested sont sur eBay Comparez les prix et les spécificités des produits neufs et d'occasion Pleins d'articles en livraison gratuite! Ansonsten spielen die Unterschiede, welche du verbaut hast (470K Poti und 22uF Kondensator) eigentlich keine große Rolle. There is no source for them anymore and the only solution for builders is to pay astronomical prices for NOS, to buy big batches of similar transistors and try to find if it any left that meets the requirements, and try to avoid the re-labeled, fakes in that journey. %���� You also have the option to opt-out of these cookies. << In the image below you can check how the Germanium Fuzz reacts to a sinusoidal input signal. In this project, we are going to build the perfect Fuzz with all the knowledge and experience that we have nowadays while keeping the tweaks and old character that make this vintage pedal to sound warm, round, and harmonically pleasant. /Type/ExtGState Disclaimer: A fuzz face is not an easy pedal to get a great sound out of! /ca 1 hfe is nowhere near as important as you think it is.



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