125B · 3 knobs
Yellow Hybrid Tone Bender
Based on the Colorsound Yellow Hybrid Tone Bender
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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- Fuzz
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From the vendor
Another Tone Bender that is more of a Big Muff. Take the first two stages of a Colorsound Supa Tone Bender , add a third stage that is part Big Muff and part Tone Bender Mk. III (with a Zener diode rather than the customary 10k/10k voltage divider), stick a weird variant of a Big Muff Tone Stack on the end, and this is what you get: <a href="https://forum.pedalpcb.com/attachments/img_5225-png.105271/" 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='1867' viewBox%3D'0 0 1400 1867'%2F%3E" data-src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/105/105290-1af9c2cc6f8ce4a136fa000e910483c9.jpg?hash=pEM_GUC3TQ" class="bbImage lazyload" style="" alt="IMG_5225.png" title="IMG_5225.png" width="150" height="201" /> <img src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/105/105290-1af9c2cc6f8ce4a136fa000e910483c9.jpg?hash=pEM_GUC3TQ" class="bbImage " style="" alt="IMG_5225.png" title="IMG_5225.png" width="150" height="201" /> In my view, it's a Muff. When I designed the PCB, I started off with my standard Big Muff PCB, made a few changes, and had a final design in about 20 minutes. It looks like Macari's/Sola Sound also thinks it's a Muff, given that they build it on a Big Muff (or maybe dual purpose) PCB: <a href="https://forum.pedalpcb.com/attachments/1761524891664-png.105282/" target="_blank"> <img src="data:image/svg+xml;charset=utf-8,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width='1600' height='1600' viewBox%3D'0 0 1600 1600'%2F%3E" data-src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/105/105301-2e33992f53d21be232ac8f1a93c0ee6e.jpg?hash=pbt14lCIoS" class="bbImage lazyload" style="" alt="1761524891664.png" title="1761524891664.png" width="150" height="150" /> <img src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/105/105301-2e33992f53d21be232ac8f1a93c0ee6e.jpg?hash=pbt14lCIoS" class="bbImage " style="" alt="1761524891664.png" title="1761524891664.png" width="150" height="150" /> When I breadboarded the circuit, I wasn't thrilled with the functionality of the gain control. So I used the handy search feature, and found that @Chuck D. Bones had some suggested mods to the circuit. (Weirdly, I can't find that thread any more, even though I looked at it a day or two ago. I swear that I'm not imagining it!) I implemented most of Chuck's suggestions at least in spirit. I didn't have a C250k for the gain pot, so I used an A250k wired upside down and backwards (picture below), which behaves essentially identically. Rather than omit R6 and ruin the symmetry of the layout, I used a 10M, which is close enough to my ears. C5 uses a 150nF capacitor on top of the PCB and a 22µ electrolytic tacked onto the back. I substituted a 680nF for C8 because I had extras, the sounded the same, and they fit the footprint better than the 470nF caps that I had on hand. Transistors are a BC109
Schematic
The schematic is in the post. Open it at Naegele Audio. No KiCad fragment has been drawn for this circuit yet.
Parts list 45 rows
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Check before you build · 1 value the reader of this schematic was not sure of
- R101: LED resistor drawn as 'CLR' with no value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 17 | ||||
| RPD | 1M | 1M | input pulldown; read from the schematic by eye | |
| R1 | 33k | 33k | read from the schematic by eye | |
| R2 | 100k | 100k | read from the schematic by eye | |
| R3 | 470k | 470k | read from the schematic by eye | |
| R4 | 15k | 15k | read from the schematic by eye | |
| R5 | 100R | 100 | read from the schematic by eye | |
| R6 | 10M | 10M | mod; stock 3k9; read from the schematic by eye | |
| R7 | 510R | 510 | mod; stock 560R; read from the schematic by eye | |
| R8 | 100k | 100k | read from the schematic by eye | |
| R9 | 470k | 470k | read from the schematic by eye | |
| R10 | 10k | 10k | read from the schematic by eye | |
| R11 | 100R | 100 | read from the schematic by eye | |
| R12 | 1k2 | 1.2k | read from the schematic by eye | |
| R13 | 3k6 | 3.6k | mod; stock 3k3; read from the schematic by eye | |
| R14 | 3k9 | 3.9k | read from the schematic by eye | |
| R15 | 3k9 | 3.9k | read from the schematic by eye | |
| R101 | ? | ? | LED current limiting resistor, drawn as CLR; read from the schematic by eye | |
| Capacitors 19 | ||||
| C1 | 100n | 100n | read from the schematic by eye | |
| C2 | 390p | 390p | read from the schematic by eye | |
| C3 | 53p | 53p | read from the schematic by eye | |
| C4 | 220n | 220n | mod; stock 100n; read from the schematic by eye | |
| C5 | 150n | 150n | mod, drawn as 150n+22µ (stock 10n): a 150n on the board; read from the schematic by eye | |
| C5 | 22µ | 22u | mod: the 22µ electrolytic beside C5's 150n, on the back of the board (from the post); read from the schematic by eye | |
| C6 | 390p | 390p | read from the schematic by eye | |
| C7 | 53p | 53p | read from the schematic by eye | |
| C8 | 680n | 680n | mod; stock 470n; read from the schematic by eye | |
| C9 | 53p | 53p | read from the schematic by eye | |
| C9A | 53p | 53p | read from the schematic by eye | |
| C10 | 390p | 390p | read from the schematic by eye | |
| C11 | 33n | 33n | read from the schematic by eye | |
| C12 | 33n | 33n | mod, drawn as 33n+10n (stock 100n); read from the schematic by eye | |
| C12 | 10n | 10n | mod: with C12's 33n, drawn as 33n+10n; read from the schematic by eye | |
| C13 | 1µ | 1u | read from the schematic by eye | |
| ×1 | 4N7 | 4.7n | mod: bridges lugs 3 and 2 of the Sustain pot (designator not drawn); read from the schematic by eye | |
| C101 | 100u | 100u | supply filter; read from the schematic by eye | |
| C102 | 100n | 100n | supply filter; read from the schematic by eye | |
| Diodes 2 | ||||
| D1 | 5V1 | 5V1 | Zener, mod; stock 4V7; read from the schematic by eye | |
| D2 | D9L | D9L | germanium, biases Q3; read from the schematic by eye | |
| Transistors 3 | ||||
| Q1 | BC109 | BC109 | hFE 245; read from the schematic by eye | |
| Q2 | BC109C | BC109C | hFE 473; read from the schematic by eye | |
| Q3 | 2SD77 | 2SD77 | germanium, hFE 58, leakage 85µA; read from the schematic by eye | |
| Potentiometers 3 | ||||
| Sustain | A250k (Backwards) | A250k | Potentiometer | mod; stock B100K; the post says an A250k wired backwards stands in for a C250k, and calls it the Fuzz (now Balance) control; read from the schematic by eye |
| Tone | B25k | B25k | Potentiometer | mod; stock W20k; read from the schematic by eye |
| Volume | A100K | A100k | Potentiometer | read from the schematic by eye |
| LEDs 1 | ||||
| LED | LED | LED | status LED; read from the schematic by eye | |