Enclosure not stated · 1 knob
Electro Harmonix Doctor Q - Vintage
Based on the Electro-Harmonix Doctor Q - Vintage
- Category
- EQ / Filter
- Controls
- Sensitivity
- Build
- Vero· 18×13· 14 cuts, 5 links
- Layout
- Unverified · no build reported at Dirtbox Layouts yet
- Tags
- Electro Harmonix, Envelope, Filter
From the post
Layout based on the old version from the 70s. Note that this one is really picky about op amp selection so be prepared for some socketing...
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 7 | ||||
| ×1 | 47Ω | 47 | read from the layout by eye | |
| ×1 | 100Ω | 100 | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×4 | 47K | 47k | read from the layout by eye | |
| ×4 | 470K | 470k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| Capacitors 6 | ||||
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×2 | 4.7nF | 4.7n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×2 | 47nF | 47n | read from the layout by eye | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 3 | ||||
| D1 | 1N914 | 1N914 | read from the layout by eye | |
| D2 | 1N914 | 1N914 | read from the layout by eye | |
| D3 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | BC239C | BC239C | read from the layout by eye | |
| ICs 1 | ||||
| IC1 | ECG778 | ECG778 | Try 1458 or 5532; read from the layout by eye | |
| Potentiometers 1 | ||||
| Sensitivity | B100K | B100k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×1 | 25K | 25k | read from the layout by eye | |
| Switches 1 | ||||
| Switch | DPDT on/on | DPDT ON/ON | toggle; read from the layout by eye | |