125B · 4 knobs
Fuzz Standard
Based on the Ibanez No. 59 Standard Fuzz· 5 other boards clone it
Want a PCB? Naegele Audio laid out a PCB for this circuit and sells boards, as well as relay bypass and I/O boards: message PedalBuilder on the PedalPCB forum.
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From the vendor
The Ibanez Standard Fuzz is an interesting variation on the Univox Super Fuzz. The two circuits are largely identical, with the following changes: The Super Fuzz's complex two transistor input stage is replaced with a simple JFET amplifier; The phase splitter transistor is biased using a collector-base feedback resistor, rather than a voltage divider; A few resistor and capacitor values are changed. See the schematic for more details These changes add up to a significantly nastier, gnarlier fuzz with a more intense octave effect. I made a few minor changes to the circuit (the schematic is at the bottom of the post). I added an A100k pot wired as a variable resistor between the mid-scoop filter and ground, labeled Tone Change. Turning the Tone Change control up decreases the resistance between the filter and ground, which increases the depth of the filter. When turned all the way down, the midrange is kept largely intact. There is a significant volume drop as the mid-scoop increases, so adjustments to the Tone Change control need to be accompanied by changes to the balance control. I also added a C5k pot between the collector of one of the octave generator transistor, labeled Octave. This control lets you dial in the intensity of the octave effect. Turned all the way down, there is no noticeable octave effect. As you turn up the knob, the intensity of the octave effect increases. As far as PCB design, I skipped the trimmer for tuning the octave generator, as I used transistors with matched hFE and V BE and tested the circuit on the breadboard before building it. I also used a new variation on my over-voltage and reverse polarity protection PCB, which uses only SMD components. The enclosure is a gray 125B from Tayda, UV printed with a double pass of white and gloss varnish. <a href="https://forum.pedalpcb.com/attachments/img_3960-png.91224/" target="_blank"> <img src="data:image/svg+xml;charset=utf-8,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width='1450' height='1933' viewBox%3D'0 0 1450 1933'%2F%3E" data-src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/91/91243-006b78ffc0fc2cae79ad75a6f3ac1465.jpg?hash=5Gm3YqXQCj" class="bbImage lazyload" style="" alt="IMG_3960.png" title="IMG_3960.png" width="150" height="200" /> <img src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/91/91243-006b78ffc0fc2cae79ad75a6f3ac1465.jpg?hash=5Gm3YqXQCj" class="bbImage " style="" alt="IMG_3960.png" title="IMG_3960.png" width="150" height="200" /> <a href="https://forum.pedalpcb.com/attachments/img_3956-png.91223/" target="_blank"> <img src="data:image/svg+xml;charset=utf-8,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width='1450' height='1934' viewBox%3D'0 0 1450 1934'%2F%3E" data-src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/91/91242-d6c2ae5fc88022172115399c704a80e9.jpg?hash=nYiUrgAocX" class="bbImage lazyload" style="" alt="IMG_3956.png" title="IMG_3956.png" width="150" height
Schematic
The schematic is in the post. Open it at Naegele Audio. No KiCad fragment has been drawn for this circuit yet.
Parts list 54 rows
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Check before you build · 1 value the reader of this schematic was not sure of
- R102: LED resistor drawn as 'CLR' with no value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 27 | ||||
| RPD | 2M2 | 2.2M | input pulldown; read from the schematic by eye | |
| R1 | 100k | 100k | read from the schematic by eye | |
| R2 | 10k | 10k | read from the schematic by eye | |
| R3 | 2k7 | 2.7k | read from the schematic by eye | |
| R4 | 30R | 30 | read from the schematic by eye | |
| R5 | 10k | 10k | read from the schematic by eye | |
| R6 | 510k | 510k | read from the schematic by eye | |
| R7 | 10k | 10k | read from the schematic by eye | |
| R8 | 10k | 10k | read from the schematic by eye | |
| R9 | 1k | 1k | read from the schematic by eye | |
| R10 | 1k | 1k | read from the schematic by eye | |
| R11 | 150k | 150k | read from the schematic by eye | |
| R12 | 22k | 22k | read from the schematic by eye | |
| R13 | 10k | 10k | read from the schematic by eye | |
| R14 | 1k | 1k | read from the schematic by eye | |
| R15 | 150k | 150k | read from the schematic by eye | |
| R16 | 22k | 22k | read from the schematic by eye | |
| R17 | 22k | 22k | read from the schematic by eye | |
| R18 | 10k | 10k | read from the schematic by eye | |
| R19 | 750k | 750k | read from the schematic by eye | |
| R20 | 75k | 75k | read from the schematic by eye | |
| R21 | 24k | 24k | read from the schematic by eye | |
| R22 | 1.2k | 1.2k | read from the schematic by eye | |
| R23 | 100k | 100k | read from the schematic by eye | |
| R24 | 51R | 51 | read from the schematic by eye | |
| R101 | 150R | 150 | supply filter; read from the schematic by eye | |
| R102 | ? | ? | LED current limiting resistor, drawn as CLR; read from the schematic by eye | |
| Capacitors 15 | ||||
| C1 | 10u | 10u | read from the schematic by eye | |
| C2 | 10u | 10u | read from the schematic by eye | |
| C3 | 10u | 10u | read from the schematic by eye | |
| C4 | 10u | 10u | read from the schematic by eye | |
| C5 | 10u | 10u | read from the schematic by eye | |
| C6 | 10u | 10u | read from the schematic by eye | |
| C7 | 10u | 10u | read from the schematic by eye | |
| C8 | 10u | 10u | read from the schematic by eye | |
| C9 | 10u | 10u | read from the schematic by eye | |
| C10 | 1n | 1n | read from the schematic by eye | |
| C11 | 220n | 220n | read from the schematic by eye | |
| C12 | 10u | 10u | read from the schematic by eye | |
| C13 | 10u | 10u | read from the schematic by eye | |
| C101 | 47u | 47u | supply filter; read from the schematic by eye | |
| C102 | 100n | 100n | supply filter; read from the schematic by eye | |
| Diodes 2 | ||||
| D1 | 1N60P | 1N60P | read from the schematic by eye | |
| D2 | 1N60P | 1N60P | read from the schematic by eye | |
| Transistors 5 | ||||
| Q1 | 2SK30A | 2SK30A | JFET; read from the schematic by eye | |
| Q2 | 2N3904 | 2N3904 | read from the schematic by eye | |
| Q3 | 2N5551 | 2N5551 | matched hFE and VBE with Q4 (from the post); read from the schematic by eye | |
| Q4 | 2N5551 | 2N5551 | matched hFE and VBE with Q3 (from the post); read from the schematic by eye | |
| Q5 | 2N5551 | 2N5551 | read from the schematic by eye | |
| Potentiometers 4 | ||||
| Fuzz Depth | B50k | B50k | Potentiometer | read from the schematic by eye |
| Octave | C5k | C5k | Potentiometer | added; read from the schematic by eye |
| Filter Depth | A100k | A100k | Potentiometer | added; labeled Tone Change in the post; read from the schematic by eye |
| Balance | A50k | A50k | Potentiometer | read from the schematic by eye |
| LEDs 1 | ||||
| LED | LED | LED | status LED; read from the schematic by eye | |
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