1590BB2 · 4 knobs
Harmonic Percolator (with mods)
Based on the Interfax Harmonic Percolator· 22 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
Here's my take on the classic Interfax Harmonic Percolator. I'll lead with the pictures of the build; the full write-up is below the last picture. <a href="https://forum.pedalpcb.com/attachments/harmonic-percolator-top-cropped-jpeg.75167/" target="_blank"> <img src="data:image/svg+xml;charset=utf-8,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width='2000' height='1934' viewBox%3D'0 0 2000 1934'%2F%3E" data-src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/75/75186-a5c575b6d53c969c5eb658754a7c6997.jpg?hash=pcV1ttU8lp" class="bbImage lazyload" style="" alt="Harmonic Percolator top cropped.jpeg" title="Harmonic Percolator top cropped.jpeg" width="156" height="150" /> <img src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/75/75186-a5c575b6d53c969c5eb658754a7c6997.jpg?hash=pcV1ttU8lp" class="bbImage " style="" alt="Harmonic Percolator top cropped.jpeg" title="Harmonic Percolator top cropped.jpeg" width="156" height="150" /> <a href="https://forum.pedalpcb.com/attachments/harmonic-percolator-inside-jpeg.75168/" target="_blank"> <img src="data:image/svg+xml;charset=utf-8,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width='1500' height='2000' viewBox%3D'0 0 1500 2000'%2F%3E" data-src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/75/75187-05c68030cfb16fcdbb9aaaf4b1c91903.jpg?hash=BcaAMM-xb8" class="bbImage lazyload" style="" alt="Harmonic Percolator inside.jpeg" title="Harmonic Percolator inside.jpeg" width="150" height="200" /> <img src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/75/75187-05c68030cfb16fcdbb9aaaf4b1c91903.jpg?hash=BcaAMM-xb8" class="bbImage " style="" alt="Harmonic Percolator inside.jpeg" title="Harmonic Percolator inside.jpeg" width="150" height="200" /> <a href="https://forum.pedalpcb.com/attachments/harmonic-percolator-side-cropped-jpeg.75171/" target="_blank"> <img src="data:image/svg+xml;charset=utf-8,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width='2000' height='1388' viewBox%3D'0 0 2000 1388'%2F%3E" data-src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/75/75190-111fd4b2aed23ee82fc6516c94f07722.jpg?hash=ER_Usq7SPu" class="bbImage lazyload" style="" alt="Harmonic Percolator side cropped.jpeg" title="Harmonic Percolator side cropped.jpeg" width="217" height="150" /> <img src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/75/75190-111fd4b2aed23ee82fc6516c94f07722.jpg?hash=ER_Usq7SPu" class="bbImage " style="" alt="Harmonic Percolator side cropped.jpeg" title="Harmonic Percolator side cropped.jpeg" width="217" height="150" /> <a href="https://forum.pedalpcb.com/attachments/harmonic-percolator-pcb-jpeg.75170/" target="_blank"> <img src="data:image/svg+xml;charset=utf-8,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width='2000' height='1758' viewBox%3D'0 0 2000 1758'%2F%3E" data-src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/75/75189-ffdf
Schematic
The schematic is in the post. Open it at Naegele Audio. No KiCad fragment has been drawn for this circuit yet.
Parts list 42 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 15 | ||||
| R1 | 1k | 1k | read from the schematic by eye | |
| R2 | 220k | 220k | read from the schematic by eye | |
| R3 | 20k | 20k | read from the schematic by eye | |
| R4 | 750k | 750k | Q3 (germanium) feedback, switched by Transistor; read from the schematic by eye | |
| R5 | 2M7 | 2.7M | Q2 (silicon) feedback, switched by Transistor; read from the schematic by eye | |
| R6 | 62k | 62k | in series with the Voltage pot; read from the schematic by eye | |
| R7 | 100k | 100k | read from the schematic by eye | |
| R8 | 62k | 62k | read from the schematic by eye | |
| R9 | 10M | 10M | read from the schematic by eye | |
| R10 | 2K7 | 2.7k | read from the schematic by eye | |
| R11 | 2K7 | 2.7k | read from the schematic by eye | |
| R12 | 4K7 | 4.7k | read from the schematic by eye | |
| R13 | 590R | 590 | switched by Clipping; read from the schematic by eye | |
| R101 | ? | ? | LED current limiting resistor, drawn as CLR; read from the schematic by eye | |
| R102 | 51R | 51 | supply filter; read from the schematic by eye | |
| Capacitors 12 | ||||
| C1 | 100p | 100p | read from the schematic by eye | |
| C2 | 33n | 33n | read from the schematic by eye | |
| C3 | 47u | 47u | read from the schematic by eye | |
| C4 | 100n | 100n | read from the schematic by eye | |
| C5 | 1n | 1n | parallel with C4; read from the schematic by eye | |
| C6 | 100n | 100n | read from the schematic by eye | |
| C7 | 2n2 | 2.2n | read from the schematic by eye | |
| C8 | 10u | 10u | read from the schematic by eye | |
| C9 | 100n | 100n | read from the schematic by eye | |
| C10 | 100u | 100u | 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 4 | ||||
| D1 | 1N914 | 1N914 | read from the schematic by eye | |
| D2 | 1N914 | 1N914 | read from the schematic by eye | |
| D3 | D310 | D310 | read from the schematic by eye | |
| D4 | D310 | D310 | read from the schematic by eye | |
| Transistors 4 | ||||
| Q1 | 182505 | 182505 | Texas Instruments germanium PNP, comparable to a 2N404 (from the post); read from the schematic by eye | |
| Q2 | BC109 | BC109 | silicon setting of the Transistor switch; read from the schematic by eye | |
| Q3 | MP35 | MP35 | germanium setting of the Transistor switch; read from the schematic by eye | |
| Q4 | 2N7000 | 2N7000 | MOSFET boost; read from the schematic by eye | |
| Potentiometers 4 | ||||
| Harmonics | A100k | A100k | Potentiometer | read from the schematic by eye |
| Voltage | B250k | B250k | Potentiometer | read from the schematic by eye |
| Symmetry | B10k | B10k | Potentiometer | dual gang (SYMMETRY.1/.2); the post says each gang has a 10k resistor across it to make about B5k; read from the schematic by eye |
| Balance | A50k | A50k | Potentiometer | read from the schematic by eye |
| Switches 2 | ||||
| Transistor | DPDT On-On | DPDT ON-ON | Q2 silicon/germanium; read from the schematic by eye | |
| Clipping | DPDT On-Off-On | DPDT ON-OFF-ON | germanium / none / silicon diodes; read from the schematic by eye | |
| LEDs 1 | ||||
| D101 | LED | LED | status LED; read from the schematic by eye | |
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