Enclosure not stated · 4 knobs
Boss HM-3 Hyper MetalVerified
Based on the Boss HM-3 Hyper Metal· 1 other board clones it
- Category
- Distortion
- Controls
- Distortion · Low · High · Volume
- Build
- Vero· 20×22· 26 cuts, 9 links
- Layout
- Verified · Tagboard Effects marks it as built and working
- Tags
- Boss, Distortion
From the post
Another one for the metal heads. The 2SK184 JFETs can still be obtained from some sellers on eBay, but it's just a buffer at the end of the day so you can use others with the same pinout like 2SK117, 2SK170, 2SK30, BF244A etc. The transistors used in the gyrators though don't seem to be readily available and I couldn't even find a specific datasheet so I've used a CBE pinout so you can use a modern NPN transistor like the 2N3904 or 2N5088 etc.
There was a DIP8 version of the M5218L made by Mitsubishi, but they may be hard to source now, so any common dual opamp can be used in there such as JRC4558, TL072, NE5532, LM358 etc.
Info about the original:
Despite its compact size, this effect can put out a richand truly powerful distortion sound which can sustain for very long durations.
Two specially designed Color Mix controls provide for wide ranging tone control.
Whether for solos or for backing, it makes possible a well balanced new age metal sound.
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 Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 38 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 1 value the reader of this layout was not sure of
- 1u5 electrolytic at the left edge by the Ground wire: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 13 | ||||
| ×8 | 10K | 10k | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| ×3 | 100K | 100k | read from the layout by eye | |
| ×2 | 3K3 | 3.3k | read from the layout by eye | |
| ×2 | 330R | 330 | read from the layout by eye | |
| ×2 | 220R | 220 | 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 | 22K | 22k | read from the layout by eye | |
| ×1 | 5K6 | 5.6k | read from the layout by eye | |
| ×1 | 4K7 | 4.7k | read from the layout by eye | |
| ×1 | 2K2 | 2.2k | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| Capacitors 15 | ||||
| ×4 | 47n | 47n | read from the layout by eye | |
| ×3 | 10n | 10n | read from the layout by eye | |
| ×2 | 1u | 1u | read from the layout by eye | |
| ×1 | 68n | 68n | read from the layout by eye | |
| ×1 | 39n | 39n | read from the layout by eye | |
| ×1 | 22n | 22n | read from the layout by eye | |
| ×1 | 8n2 | 8.2n | read from the layout by eye | |
| ×1 | 6n8 | 6.8n | read from the layout by eye | |
| ×1 | 1n2 | 1.2n | read from the layout by eye | |
| ×1 | 100p | 100p | read from the layout by eye | |
| ×1 | 47p | 47p | read from the layout by eye | |
| ×2 | 100u | 100u | electrolytic; read from the layout by eye | |
| ×1 | 10u | 10u | electrolytic; read from the layout by eye | |
| ×1 | 1u5 | 1.5u | electrolytic; read from the layout by eye | |
| ×1 | 1u | 1u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×5 | 1SS133 | 1SS133 | D1 to D5; try 1N4148; read from the layout by eye | |
| Transistors 4 | ||||
| Q1 | 2SK184-GR | 2SK184-GR | JFET; try 2SK117, 2SK170, 2SK30 etc; read from the layout by eye | |
| Q2 | 2SC3378-GR | 2SC3378-GR | try 2N3904, 2N5088 etc; read from the layout by eye | |
| Q3 | 2SC3378-GR | 2SC3378-GR | try 2N3904, 2N5088 etc; read from the layout by eye | |
| Q4 | 2SC3378-GR | 2SC3378-GR | try 2N3904, 2N5088 etc; read from the layout by eye | |
| ICs 1 | ||||
| ×2 | M5218L | M5218L | try other common dual opamps; read from the layout by eye | |
| Potentiometers 4 | ||||
| Distortion | A50K | A50k | Potentiometer | read from the layout by eye |
| Low | B10K | B10k | Potentiometer | read from the layout by eye |
| High | B10K | B10k | Potentiometer | read from the layout by eye |
| Volume | A50K | A50k | Potentiometer | read from the layout by eye |
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