Enclosure not stated · 3 knobs
Supa Pie
Based on the Colorsound Supa Tonebender· 2 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.
- Category
- Fuzz
- Price
- see vendor
- Tags
- PedalPCB forum, PCB by message
From the vendor
Despite the Tone Bender name, it's definitely a Big Muff. It's similar to some of the Ram's Head-era Big Muffs, but with a few differences. First and foremost, Q2 has no clipping diodes, which increases the output volume significantly and results in what sounds like heavily asymmetrical clipping. Second, the tone control is wired backwards, and uses a log taper pot. Third, there's an extra 100nF capacitor between the Q3 collector and the tone stack. Other than this last change, you can easily build one of these on a standard Big Muff board by omitting the diodes and their coupling capacitor from the second gain stage and using a C-taper pot for the tone control (or an A-taper pot with lugs 1 and 3 swapped, if you want the backwards tone control of the original). I didn't have a C100k potentiometer on hand, so I went with an A100k with the connections of lugs 1 and 3 swapped. To add the extra capacitor, I cut the trace on the back side of the PCB that connected Q3C and the Tone Stack, and jumpered it with a 100nF capacitor that I tacked on to the back of the board. Supposedly the Supa Tone Bender works really well on bass. I don't have one currently, but it does have more low end than any non-Russian muff that I've build. Transistors are BC549B and 2N3904; diodes are 1N4150 for a little extra clipping and compression. I skipped my usual I/O boards because I had some extra @StompBoxParts audio jacks lying around and all of the components are rated for well over 18v. These jacks have a set of teeth that help hold them in place, which is very thoughtful feature to have. Reverse polarity protection is provided via an offboard 1N5817. Spoiler: Schematic <a href="https://forum.pedalpcb.com/attachments/1761188215888-png.105071/" target="_blank"> <img src="data:image/svg+xml;charset=utf-8,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width='1064' height='433' viewBox%3D'0 0 1064 433'%2F%3E" data-src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/105/105090-610b3899b9cf7e961e76d7274efe43c3.jpg?hash=D7v2TX7CEJ" class="bbImage lazyload" style="" alt="1761188215888.png" title="1761188215888.png" width="369" height="150" /> <img src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/105/105090-610b3899b9cf7e961e76d7274efe43c3.jpg?hash=D7v2TX7CEJ" class="bbImage " style="" alt="1761188215888.png" title="1761188215888.png" width="369" height="150" /> <a href="https://forum.pedalpcb.com/attachments/img_5207-png.105069/" target="_blank"> <img src="data:image/svg+xml;charset=utf-8,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width='1400' height='1868' viewBox%3D'0 0 1400 1868'%2F%3E" data-src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/105/105088-0e6fec62bc30c47c7c8cff18471f5f7f.jpg?hash=OVbeufTL9r" class="bbImage lazyload" style="" alt="IMG_5207.png" title="IMG_5207.png" width="150" height="201" /> <img src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/105/1050
Schematic
The schematic is in the post. Open it at Naegele Audio. No KiCad fragment has been drawn for this circuit yet.
Parts list 46 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 22 | ||||
| R2 | 33k | 33k | read from the schematic by eye | |
| R3 | 100k | 100k | read from the schematic by eye | |
| R4 | 2.7k | 2.7k | read from the schematic by eye | |
| R5 | 33k | 33k | read from the schematic by eye | |
| R6 | 10k | 10k | read from the schematic by eye | |
| R7 | 390k | 390k | read from the schematic by eye | |
| R8 | 33K | 33k | read from the schematic by eye | |
| R9 | 470k | 470k | read from the schematic by eye | |
| R10 | 100Ω | 100 | read from the schematic by eye | |
| R11 | 15k | 15k | 18k used circa 1978; read from the schematic by eye | |
| R12 | 8.2k | 8.2k | read from the schematic by eye | |
| R13 | 15k | 15k | 18k used circa 1978; read from the schematic by eye | |
| R14 | 100k | 100k | read from the schematic by eye | |
| R15 | 470k | 470k | read from the schematic by eye | |
| R16 | 100k | 100k | read from the schematic by eye | |
| R17 | 470k | 470k | read from the schematic by eye | |
| R18 | 10k | 10k | read from the schematic by eye | |
| R19 | 8.2k | 8.2k | read from the schematic by eye | |
| R20 | 100k | 100k | read from the schematic by eye | |
| R21 | 100Ω | 100 | read from the schematic by eye | |
| R22 | 100Ω | 100 | read from the schematic by eye | |
| R23 | 820Ω | 820 | 560k also used; read from the schematic by eye | |
| Capacitors 14 | ||||
| C1 | .1µF | 100n | read from the schematic by eye | |
| C2 | .1µF | 100n | read from the schematic by eye | |
| C3 | .1µF | 100n | read from the schematic by eye | |
| C4 | .1µF | 100n | read from the schematic by eye | |
| C5 | .1µF | 100n | read from the schematic by eye | |
| C7 | .1µF | 100n | read from the schematic by eye | |
| C8 | .01µF | 10n | read from the schematic by eye | |
| C9 | .0047µF | 4.7n | read from the schematic by eye | |
| C10 | 470pF | 470p | read from the schematic by eye | |
| C11 | 470pF | 470p | read from the schematic by eye | |
| C12 | 470pF | 470p | read from the schematic by eye | |
| C13 | .1µF | 100n | read from the schematic by eye | |
| C14 | .1µF | 100n | the extra cap between Q2 collector and the tone stack; read from the schematic by eye | |
| ×1 | 33µF | 33u | supply filter, no designator drawn; 22µF and 47µF also used; read from the schematic by eye | |
| Diodes 3 | ||||
| D1 | 1N4148 | 1N4148 | Naegele Audio used 1N4150 (from the post); read from the schematic by eye | |
| D2 | 1N4148 | 1N4148 | Naegele Audio used 1N4150 (from the post); read from the schematic by eye | |
| ×1 | 1N5817 | 1N5817 | offboard reverse polarity protection (from the post; not drawn); read from the schematic by eye | |
| Transistors 4 | ||||
| Q1 | BC184 | BC184 | Naegele Audio used BC549B and 2N3904 (from the post, positions not stated); read from the schematic by eye | |
| Q2 | BC184 | BC184 | read from the schematic by eye | |
| Q3 | BC184 | BC184 | read from the schematic by eye | |
| Q4 | BC184 | BC184 | read from the schematic by eye | |
| Potentiometers 3 | ||||
| Sustain | 100k Log | A100k | Potentiometer | R24; read from the schematic by eye |
| Tone | 100k Log | A100k | Potentiometer | R25, wired backwards in the original; Naegele Audio used an A100k with lugs 1 and 3 swapped (from the post); read from the schematic by eye |
| Volume | 100k Log | A100k | Potentiometer | R26; read from the schematic by eye |
Other boards based on the Colorsound Supa Tonebender
- Colorsound Supa Tonebender Dirtbox Layouts
- Colorsound Supa ToneBender Tagboard Effects