Enclosure not stated · 6 knobs
Dunwich Amplification DIY HM2 "2021 Edition"Verified
Based on the Dunwich Amplification DIY HM2 "2021 Edition
- Category
- Distortion
- Build
- Vero· 25×28· 48 cuts, 24 links
- Layout
- Verified · Dirtbox Layouts marks it as built and working
- Tags
- Distortion, Dunwich Amplification, HM-2
From the post
Another take by Dunwich Amplification on the mighty HM2 circuit. Just released as a DIY project at OSH Park it has some tweaks all along the circuit compared to the stock Boss schematic. It also has a built in active clean blend circuit and switches for both hard and soft clipping diodes.
Schematic and BOM can be downloaded at OSH Park.
...and a layout with "Dope-Ass Lower-Tuned" values for the gyrator eq section requested (?) by MTK. These values were calculated by Ryan from Heard Sound Circuits and makes things sound....more evil. (Low: 62,48 Hz, Mid: 716,67 Hz, High: 1065,5 Hz)
Demo time with MTK!
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 45 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 2 values the reader of this layout was not sure of
- 100nF at rows T-U column 3 is drawn as a small yellow ceramic disc: printed clearly, unusual body for that value
- D4-D5: legend says only 'Germanium', no part number
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 13 | ||||
| ×10 | 10K | 10k | read from the layout by eye | |
| ×5 | 100K | 100k | read from the layout by eye | |
| ×4 | 1M | 1M | read from the layout by eye | |
| ×3 | 330Ω | 330 | read from the layout by eye | |
| ×2 | 100Ω | 100 | 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 | 82K | 82k | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 120Ω | 120 | read from the layout by eye | |
| ×1 | 150Ω | 150 | read from the layout by eye | |
| Capacitors 14 | ||||
| ×3 | 100pF | 100p | read from the layout by eye | |
| ×1 | 330pF | 330p | read from the layout by eye | |
| ×1 | 470pF | 470p | read from the layout by eye | |
| ×2 | 1nF | 1n | read from the layout by eye | |
| ×1 | 4.7nF | 4.7n | read from the layout by eye | |
| ×1 | 6.8nF | 6.8n | read from the layout by eye | |
| ×4 | 47nF | 47n | read from the layout by eye | |
| ×1 | 68nF | 68n | read from the layout by eye | |
| ×3 | 100nF | 100n | read from the layout by eye | |
| ×1 | 150nF | 150n | read from the layout by eye | |
| ×2 | 1uF | 1u | read from the layout by eye | |
| ×1 | 1.5uF | 1.5u | read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×2 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 3 | ||||
| ×5 | 1N914 | 1N914 | D1-D3, D6-D7; legend: 1N914/1N4148; read from the layout by eye | |
| ×2 | Germanium | GERMANIUM | D4, D5; legend: Germanium, no part number; read from the layout by eye | |
| D8 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | 2N5457 | 2N5457 | JFET; read from the layout by eye | |
| Q2 | 2N3904 | 2N3904 | read from the layout by eye | |
| Q3 | 2N3906 | 2N3906 | read from the layout by eye | |
| ICs 4 | ||||
| IC1 | TL072 | TL072 | read from the layout by eye | |
| IC2 | TL072 | TL072 | read from the layout by eye | |
| IC3 | TL072 | TL072 | read from the layout by eye | |
| IC4 | TL072 | TL072 | read from the layout by eye | |
| Potentiometers 6 | ||||
| Dist | A250K | A250k | Potentiometer | read from the layout by eye |
| High | B10K | B10k | Potentiometer | read from the layout by eye |
| Low | B10K | B10k | Potentiometer | read from the layout by eye |
| Mid | B10K | B10k | Potentiometer | read from the layout by eye |
| Blend | B1M | B1M | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Switches 2 | ||||
| Soft Sw | SPST | SPST | toggle; read from the layout by eye | |
| Hard Sw | SPST | SPST | toggle; read from the layout by eye | |