Enclosure not stated · 1 knob
Maestro FRB-1 Full Range Booster
Based on the Maestro FRB-1 Full Range Booster
From the post
With added voltage doubler since original units had two 9v batteries.
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 38 rows
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Check before you build · 2 values the reader of this layout was not sure of
- 25nF film cap at the top (column 11, rows B-D): printed clearly, unusual value
- 500pF ceramic cap (column 14, rows J-L): printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×8 | 100K | 100k | read from the layout by eye | |
| ×5 | 470K | 470k | read from the layout by eye | |
| ×4 | 15K | 15k | read from the layout by eye | |
| ×4 | 33K | 33k | read from the layout by eye | |
| ×4 | 200K | 200k | read from the layout by eye | |
| ×2 | 47K | 47k | read from the layout by eye | |
| ×1 | 82K | 82k | read from the layout by eye | |
| ×1 | 180K | 180k | read from the layout by eye | |
| ×1 | 390K | 390k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 1.5M | 1.5M | read from the layout by eye | |
| Capacitors 11 | ||||
| ×3 | 10nF | 10n | read from the layout by eye | |
| ×3 | 100nF | 100n | read from the layout by eye | |
| ×1 | 500pF | 500p | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 2.7nF | 2.7n | read from the layout by eye | |
| ×1 | 25nF | 25n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×3 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×2 | 100uF | 100u | electrolytic; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×2 | 1N4148 | 1N4148 | D1, D2; read from the layout by eye | |
| ×3 | 1N5817 | 1N5817 | D3-D5; read from the layout by eye | |
| Transistors 5 | ||||
| Q1 | 2N5088 | 2N5088 | read from the layout by eye | |
| Q2 | 2N5088 | 2N5088 | read from the layout by eye | |
| Q3 | 2N5088 | 2N5088 | read from the layout by eye | |
| Q4 | 2N5088 | 2N5088 | read from the layout by eye | |
| Q5 | 2N5088 | 2N5088 | read from the layout by eye | |
| ICs 2 | ||||
| IC1 | LM741 | LM741 | read from the layout by eye | |
| IC2 | ICL7660S | ICL7660S | read from the layout by eye | |
| Potentiometers 1 | ||||
| Volume | B100K | B100k | Potentiometer | read from the layout by eye |
| Switches 6 | ||||
| Fuzz | SPDT on/on | SPDT ON/ON | toggle; read from the layout by eye | |
| Treble | SPST | SPST | toggle; read from the layout by eye | |
| Bass | SPST | SPST | toggle; read from the layout by eye | |
| Mid | SPST | SPST | toggle; read from the layout by eye | |
| Upper Mid | SPST | SPST | toggle; read from the layout by eye | |
| PWR Boost | 4PDT on/on | 4PDT ON/ON | toggle; read from the layout by eye | |