Enclosure not stated · 2 knobs
AMZ Dr. QuackVerified
Based on the AMZ Dr. Quack· 1 other board clones it
- Category
- EQ / Filter
- Controls
- Sensitivity · Range
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- AMZ, Electro Harmonix, Filter
From the post
The Dr. Quack is Jack Orman's improvement on the EHX Dr. Q envelope filter. Basically, there's an added input buffer to increase the input impedance (which is kinda low in the Dr. Q) and offers better range control. Check out Jack's blog post on the circuit for more information and a few mods.
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 Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.
Parts list 25 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 100nF film cap at bottom left (column B, rows J-M): the populated vero prints 100nF, the wiring diagram prints 10nF for the same part; vero value entered
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×5 | 47K | 47k | read from the layout by eye | |
| ×3 | 470K | 470k | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| ×2 | 10K | 10k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 100Ω | 100 | read from the layout by eye | |
| ×1 | 47Ω | 47 | read from the layout by eye | |
| Capacitors 6 | ||||
| ×3 | 47nF | 47n | read from the layout by eye | |
| ×2 | 4.7nF | 4.7n | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 100nF | 100n | wiring diagram prints 10nF; read from the layout by eye | |
| ×3 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| D3 | 1N4148 | 1N4148 | read from the layout by eye | |
| D4 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | 2N5457 | 2N5457 | JFET; 2N5457 or similar; read from the layout by eye | |
| Q2 | 2N3904 | 2N3904 | 2N3904 or similar; read from the layout by eye | |
| ICs 1 | ||||
| IC | TL072 | TL072 | TL072 or similar; read from the layout by eye | |
| Potentiometers 2 | ||||
| Sensitivity | B100K | B100k | Potentiometer | read from the layout by eye |
| Range | B25K | B25k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Norm/Bass | DPDT | DPDT | toggle; read from the layout by eye | |
| LEDs 2 | ||||
| D1 | Red LED | RED LED | read from the layout by eye | |
| D2 | Red LED | RED LED | read from the layout by eye | |
Other boards based on the AMZ Dr. Quack
- Dr. Quack Tagboard Effects