Enclosure not stated · 6 knobs
OKKO Diablo Boost+ version
Based on the OKKO Diablo Boost+ version
From the post
Several versions has been made of this great sounding overdrive and this version is called "Boost+.The layout is based on the schematic at FSB but I took the liberty to do some changes that could be useful. First, the J FETs remains to be unknown so I added a Bias trimpot to be able to use several types of J Fets. Second, the internal 9v/18v switch is now panel mounted. Third, Level+ control is now external....simply because there are too many trimpots already! All the trimpots (except for the Bias) is on the edge of the board for the option to build an 11 knob overdribe...:-p.
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 37 rows
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Check before you build · 2 values the reader of this layout was not sure of
- 9v/18v switch: type not given in the legend, SPDT assumed from the three wires labelled '9v/18v Sw'
- Q1-Q7: legend says 'Unknown N-Ch J FETs', 2N5457 is only its first suggestion
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×6 | 1M | 1M | read from the layout by eye | |
| ×5 | 10K | 10k | read from the layout by eye | |
| ×3 | 470K | 470k | read from the layout by eye | |
| ×4 | 1K | 1k | read from the layout by eye | |
| ×1 | 100Ω | 100 | read from the layout by eye | |
| ×1 | 3.3K | 3.3k | read from the layout by eye | |
| ×2 | 47K | 47k | read from the layout by eye | |
| ×1 | 43K | 43k | read from the layout by eye | |
| ×1 | 39K | 39k | read from the layout by eye | |
| Capacitors 11 | ||||
| ×2 | 470pF | 470p | ceramic; read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×2 | 3.3nF | 3.3n | read from the layout by eye | |
| ×1 | 8.2nF | 8.2n | read from the layout by eye | |
| ×2 | 10nF | 10n | 1 film, 1 ceramic; read from the layout by eye | |
| ×2 | 47nF | 47n | read from the layout by eye | |
| ×5 | 100nF | 100n | read from the layout by eye | |
| ×2 | 1uF | 1u | film; read from the layout by eye | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×4 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×3 | 1N5817 | 1N5817 | D1-D3; read from the layout by eye | |
| Transistors 1 | ||||
| ×7 | 2N5457 | 2N5457 | Q1-Q7, JFET; Unknown N-Ch J FETs, try 2N5457, J113, J201 etc.; read from the layout by eye | |
| ICs 1 | ||||
| IC1 | ICL7660S | ICL7660S | 7660S/MAX1044; read from the layout by eye | |
| Potentiometers 6 | ||||
| Gain | A500K | A500k | Potentiometer | read from the layout by eye |
| Body | B1M | B1M | Potentiometer | read from the layout by eye |
| Feed | B1M | B1M | Potentiometer | read from the layout by eye |
| Tone | B100K | B100k | Potentiometer | read from the layout by eye |
| Level | A100K | A100k | Potentiometer | read from the layout by eye |
| Level+ | A100K | A100k | Potentiometer | read from the layout by eye |
| Trimmers 6 | ||||
| Tone+ | 100K | 100k | read from the layout by eye | |
| Bass+ | 100K | 100k | read from the layout by eye | |
| Gain+ | 5K | 5k | read from the layout by eye | |
| Bass | 100K | 100k | read from the layout by eye | |
| Bias | 1K | 1k | read from the layout by eye | |
| Presence | 100K | 100k | read from the layout by eye | |
| Switches 2 | ||||
| More | 3PDT | 3PDT | footswitch, boost; read from the layout by eye | |
| 9v/18v | SPDT | SPDT | toggle, type not given; read from the layout by eye | |