Enclosure not stated · 6 knobs
Dunwich Amplification Modified HM2 - "Left Hand Path" versionVerified
Based on the Dunwich Amplification Modified HM2 - "Left Hand Path" version
- Category
- Distortion
- Build
- Vero· 26×25· 51 cuts, 21 links
- Layout
- Verified · Dirtbox Layouts marks it as built and working
- Tags
- Distortion, Dunwich Amplification, HM-2
From the post
Traced by AlexS and Fuzzhead, this is a quite tweakable and heavily modified HM2 variant with more gain on tap, more volume, two on/off/on diode switches and a very flexible four band eq. It is a quite noisy beast when Gain and all eq controls is maxed out though but a buffer up front helps a lot. Or you can increase 1K resistor connecting to Gain 3 to calms things down. Stock HM2 value is 47k so there is a pretty wide margin to experiment within. Layout is verified.
Schematic
This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Dirtbox Layouts. No KiCad fragment has been drawn for this circuit yet.
Parts list 50 rows
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Check before you build · 2 values the reader of this layout was not sure of
- D10 and D11 (rows Q-R, columns 5-7) are drawn as round red LEDs; the legend's '3mm red LEDs' line names D7-D8, taken as a slip for D10-D11
- D4-D6: legend says only 'Shottky' (Schottky), no part number
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| ×7 | 10K | 10k | read from the layout by eye | |
| ×7 | 100K | 100k | read from the layout by eye | |
| ×4 | 330Ω | 330 | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| ×2 | 3.3K | 3.3k | read from the layout by eye | |
| ×2 | 22K | 22k | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 150Ω | 150 | read from the layout by eye | |
| ×1 | 120Ω | 120 | read from the layout by eye | |
| ×1 | 22Ω | 22 | read from the layout by eye | |
| Capacitors 12 | ||||
| ×4 | 47nF | 47n | read from the layout by eye | |
| ×4 | 1uF | 1u | read from the layout by eye | |
| ×3 | 1nF | 1n | read from the layout by eye | |
| ×2 | 68nF | 68n | read from the layout by eye | |
| ×2 | 100pF | 100p | read from the layout by eye | |
| ×1 | 1.5uF | 1.5u | read from the layout by eye | |
| ×1 | 330nF | 330n | read from the layout by eye | |
| ×1 | 150nF | 150n | read from the layout by eye | |
| ×1 | 15nF | 15n | read from the layout by eye | |
| ×1 | 4.7nF | 4.7n | read from the layout by eye | |
| ×2 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| Diodes 10 | ||||
| D1 | 1N4148 | 1N4148 | read from the layout by eye | |
| D2 | 1N4148 | 1N4148 | read from the layout by eye | |
| D3 | 1N4148 | 1N4148 | read from the layout by eye | |
| D4 | Schottky | SCHOTTKY | part number not given; read from the layout by eye | |
| D5 | Schottky | SCHOTTKY | part number not given; read from the layout by eye | |
| D6 | Schottky | SCHOTTKY | part number not given; read from the layout by eye | |
| D7 | 1N4148 | 1N4148 | read from the layout by eye | |
| D8 | 1N4148 | 1N4148 | read from the layout by eye | |
| D9 | 1N4148 | 1N4148 | read from the layout by eye | |
| D12 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | 2N5457 | 2N5457 | JFET; legend: 2N5457, J201, J113 etc.; read from the layout by eye | |
| Q2 | 2N3904 | 2N3904 | legend: 2N3904/2N5088; read from the layout by eye | |
| Q3 | 2N3906 | 2N3906 | PNP; legend: 2N3906/2N5087; read from the layout by eye | |
| ICs 3 | ||||
| IC1 | TLC2262 | TLC2262 | read from the layout by eye | |
| IC2 | TL072 | TL072 | read from the layout by eye | |
| IC3 | TL074 | TL074 | read from the layout by eye | |
| Potentiometers 6 | ||||
| Gain | A250K | A250k | Potentiometer | read from the layout by eye |
| Low | B10K | B10k | Potentiometer | 100 Hz; read from the layout by eye |
| Low Mid | B10K | B10k | Potentiometer | 400 Hz; read from the layout by eye |
| High Mid | B10K | B10k | Potentiometer | 1 kHz; read from the layout by eye |
| High | B10K | B10k | Potentiometer | 3.3 kHz; read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Switches 2 | ||||
| Hard Sw | SPDT on/off/on | SPDT ON/OFF/ON | toggle; read from the layout by eye | |
| Soft Sw | SPDT on/off/on | SPDT ON/OFF/ON | toggle; read from the layout by eye | |
| LEDs 2 | ||||
| D10 | 3mm red LED | 3MM RED LED | on the board; legend names these D7-D8; read from the layout by eye | |
| D11 | 3mm red LED | 3MM RED LED | on the board; legend names these D7-D8; read from the layout by eye | |