Enclosure not stated · 4 knobs
Hawk II Tonal Expander
Based on the Hawk II Tonal Expander
From the post
With some modern improvements: • Onboard voltage doubler for 18v operation. • Series inductor for the Bass control since stock value is impossible to source nowadays. • Master volume control. Schematic is avaiable HERE.
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 35 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 13K at column 3 rows O-Q: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×2 | 100K | 100k | read from the layout by eye | |
| ×2 | 1.5K | 1.5k | read from the layout by eye | |
| ×2 | 220Ω | 220 | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×1 | 13K | 13k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 560K | 560k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 120Ω | 120 | read from the layout by eye | |
| Capacitors 9 | ||||
| ×3 | 47nF | 47n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×1 | 22nF | 22n | read from the layout by eye | |
| ×1 | 150nF | 150n | read from the layout by eye | |
| ×1 | 2.2uF | 2.2u | electrolytic, min 35V; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic, min 35V; read from the layout by eye | |
| ×2 | 33uF | 33u | electrolytic, min 35V; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic, min 35V; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 3 | ||||
| D1 | 1N5817 | 1N5817 | read from the layout by eye | |
| D2 | 1N5817 | 1N5817 | read from the layout by eye | |
| D3 | 1N5817 | 1N5817 | read from the layout by eye | |
| ICs 2 | ||||
| IC1 | 1458 | 1458 | read from the layout by eye | |
| IC2 | MAX1044 | MAX1044 | legend: MAX1044/ICL7660S; read from the layout by eye | |
| Inductors 4 | ||||
| IND1 | 27mH | 27mH | read from the layout by eye | |
| IND2 | 150mH | 150mH | read from the layout by eye | |
| IND3 | 150mH | 150mH | read from the layout by eye | |
| IND4 | 150mH | 150mH | read from the layout by eye | |
| Potentiometers 4 | ||||
| Bass | B25K | B25k | Potentiometer | read from the layout by eye |
| Middle | B25K | B25k | Potentiometer | read from the layout by eye |
| Treble | B25K | B25k | Potentiometer | read from the layout by eye |
| Master | A100K | A100k | Potentiometer | read from the layout by eye |
| Switches 2 | ||||
| Treble Boost | SPDT on/on | SPDT ON/ON | toggle; read from the layout by eye | |
| Gain Boost | SPDT on/on | SPDT ON/ON | toggle; read from the layout by eye | |