Enclosure not stated · 2 knobs
Dharma Sound / Colorsound DistorterVerified
Based on the Colorsound Distorter· 1 other board clones it
- Category
- Distortion
- Build
- Vero· 20×19· 23 cuts, 11 links
- Layout
- Verified · Dirtbox Layouts marks it as built and working
- Tags
- Colorsound/Solasound, Dharma Sound, Distortion
From the post
Here is a forgotten oldie that has been requested ever since Colorsound released a small run of replicas in the fall of 2023. Dharma Sound was a small operation builder from Kent, OK, active in the 70s. The circuit design is pretty interesting; first a BJT input buffer. Then the signal is split into two parallel active fixed filters. The signal is then joined together before it hits the LM741 op amp with stacked clipping diodes to generate distortion. . Sound clips suggest that it sounds like a distortion with a cocked wah tone. Schematic is avaiable HERE. Oh, and this is post #1500! *Edit 24221* Verified by Henrik.
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 21 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×8 | 10K | 10k | read from the layout by eye | |
| ×3 | 220K | 220k | read from the layout by eye | |
| ×2 | 33K | 33k | read from the layout by eye | |
| ×2 | 22K | 22k | read from the layout by eye | |
| ×2 | 5.6K | 5.6k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 470Ω | 470 | read from the layout by eye | |
| ×1 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| Capacitors 4 | ||||
| ×5 | 100nF | 100n | read from the layout by eye | |
| ×2 | 10nF | 10n | read from the layout by eye | |
| ×2 | 6.8nF | 6.8n | read from the layout by eye | |
| ×3 | 10uF | 10u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×4 | 1N4148 | 1N4148 | D1-D4; read from the layout by eye | |
| D5 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | BC182 | BC182 | read from the layout by eye | |
| ICs 2 | ||||
| IC1 | MC1458 | MC1458 | read from the layout by eye | |
| IC2 | LM741 | LM741 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Attack | A100K | A100k | Potentiometer | read from the layout by eye |
| Level | A10K | A10k | Potentiometer | read from the layout by eye |
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