Enclosure not stated · 3 knobs
Latent Lemon Hurts (trace)
Based on the Latent Lemon Audio Hurts· 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.
From the vendor
It's a really cool take on the Harmonic Percolator. I traced it from some photos, which isn't generally the best practice, but what I have on the breadboard sounds right on to my ears. Anyway, it's a simple but fun dirt circuit. Here's the schematic: <a href="https://forum.pedalpcb.com/attachments/1000-hurts-schematic-png.101846/" 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='1639' viewBox%3D'0 0 2000 1639'%2F%3E" data-src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/101/101865-5cb7ba9e74b3f1809dc169703f1a80a6.jpg?hash=OuuRjAq3rB" class="bbImage lazyload" style="" alt="1000 Hurts Schematic.png" title="1000 Hurts Schematic.png" width="184" height="150" /> <img src="https://pedalpcb-forum.nyc3.digitaloceanspaces.com/data/attachments/101/101865-5cb7ba9e74b3f1809dc169703f1a80a6.jpg?hash=OuuRjAq3rB" class="bbImage " style="" alt="1000 Hurts Schematic.png" title="1000 Hurts Schematic.png" width="184" height="150" /> Some notes: For Q1, any low leakage germanium with an hFE between 30 and 70 works well, with best results between 40 and 60. Below 30 is too dark/sputtery, above 70 is too bright/smooth, but that's my personal preferences—go on and experiment yourself! For Q2, shoot for something in the 225-275 range. Tayda's 2N3904 work great here, no need to spring for something fancy, the 2¢ transistor works just fine. For the germanium diodes, it looks like the earliest models used 1N695 before switching to a large black Soviet diode (probably D310, but maybe D311 or D312), and now D18. There is a huge difference in the I/V curves of the D31x and D18 ( see for yourself! ), so you can probably use anything here. The Deep switch adds a 100nF capacitor in parallel with the 47nF input capacitor, and simultaneously adds a 1M trim pot parallel to R2. Without the parallel trim pot, you will get low frequency oscillation at certain settings of the guitar/pedal controls. Start with the trim pot turned all the way to 1M, and turn it down until the oscillation stops.
Schematic
The schematic is in the post. Open it at Naegele Audio. No KiCad fragment has been drawn for this circuit yet.
Parts list 29 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 6 | ||||
| R2 | 220k | 220k | read from the schematic by eye | |
| R3 | 1k | 1k | read from the schematic by eye | |
| R5 | 91k | 91k | read from the schematic by eye | |
| R6 | 4k7 | 4.7k | in series with D1 (asymmetric germanium clipping); read from the schematic by eye | |
| R101 | 47R | 47 | supply filter; read from the schematic by eye | |
| R102 | 3k3 | 3.3k | LED resistor; the drawing notes it is taken from before R101, as on the original; read from the schematic by eye | |
| Capacitors 8 | ||||
| C1 | 100p | 100p | 47p-150p seen; read from the schematic by eye | |
| C2 | 47n | 47n | read from the schematic by eye | |
| C3 | 100n | 100n | switched in parallel with C2 by Deep; read from the schematic by eye | |
| C4 | 47µ | 47u | read from the schematic by eye | |
| C5 | 100n | 100n | read from the schematic by eye | |
| C6 | 1n | 1n | 1n-1n5 seen; read from the schematic by eye | |
| C7 | 100n | 100n | read from the schematic by eye | |
| C101 | 100µ | 100u | supply filter; read from the schematic by eye | |
| Diodes 5 | ||||
| D1 | D18 | D18 | germanium; the post says early units used 1N695, then a large Soviet D31x, now D18; read from the schematic by eye | |
| D2 | D18 | D18 | germanium; read from the schematic by eye | |
| D3 | 1N914 | 1N914 | read from the schematic by eye | |
| D4 | 1N914 | 1N914 | read from the schematic by eye | |
| D101 | 1N5817 | 1N5817 | reverse polarity protection; read from the schematic by eye | |
| Transistors 2 | ||||
| Q1 | MP16B | MP16B | germanium PNP; the post suggests any low-leakage germanium with hFE 30-70; read from the schematic by eye | |
| Q2 | 2N3904 | 2N3904 | read from the schematic by eye | |
| Potentiometers 3 | ||||
| Harmonics | A100k | A100k | Potentiometer | read from the schematic by eye |
| Sputter | A100k | A100k | Potentiometer | read from the schematic by eye |
| Balance | A100k | A100k | Potentiometer | read from the schematic by eye |
| Trimmers 2 | ||||
| Octave | 5M | 5M | Q2 collector-base feedback (a trim pot per Naegele Audio's Hurts Percolators post); read from the schematic by eye | |
| OSC | 1M | 1M | switched across R2 by Deep to stop low-frequency oscillation (trim pot from the post); read from the schematic by eye | |
| Switches 2 | ||||
| Deep | DPDT ON/ON | DPDT ON/ON | adds C3 and the OSC trim; read from the schematic by eye | |
| Ge/Si | On/Off/On | ON/OFF/ON | germanium, none, or silicon clipping diodes; read from the schematic by eye | |
| LEDs 1 | ||||
| D102 | Yellow LED | YELLOW LED | status LED; read from the schematic by eye | |
Other boards based on the Latent Lemon Audio Hurts
- Latent Lemon Audio Hurts Dirtbox Layouts
- Hurts Harmonic Percolators Naegele Audio · 1590BB2